Kubernetes学习-K8S安装篇-Kubeadm高可用安装K8S集群
1. Kubernetes 高可用安装
1.1 kubeadm高可用安装k8s集群1.23.1
1.1.1 基本环境配置
- Kubectl debug 设置一个临时容器
- Sidecar
- Volume：更改目录权限，fsGroup
- ConfigMap和Secret
K8S官网：https://kubernetes.io/docs/setup/
最新版高可用安装：https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/
高可用Kubernetes集群规划
| 主机名 | IP地址 | 说明 |
|---|---|---|
| k8s-master01 | 10.0.0.100 | master节点01 |
| k8s-master02 | 10.0.0.101 | master节点02 |
| k8s-master03 | 10.0.0.102 | master节点03 |
| k8s-master-lb | 10.0.0.200 | keepalived虚拟IP |
| k8s-node01 | 10.0.0.103 | node节点01 |
| k8s-node02 | 10.0.0.104 | node节点02 |
VIP（虚拟IP）不要和公司内网IP重复，首先去ping一下，不通才可用。VIP需要和主机在同一个局域网内！
服务器环境配置
| IP地址 | 系统版本 | 内核版本 | CPU内存磁盘 |
|---|---|---|---|
| 10.0.0.100 | centos8.4.2105 | 4.18.0-305.3.1.el8.x86_64 | 2C2G30G |
| 10.0.0.101 | centos8.4.2105 | 4.18.0-305.3.1.el8.x86_64 | 2C2G30G |
| 10.0.0.102 | centos8.4.2105 | 4.18.0-305.3.1.el8.x86_64 | 2C2G30G |
| 10.0.0.103 | centos8.4.2105 | 4.18.0-305.3.1.el8.x86_64 | 2C2G30G |
| 10.0.0.104 | centos8.4.2105 | 4.18.0-305.3.1.el8.x86_64 | 2C2G30G |
所有节点修改主机名
[root@localhost ~]# hostnamectl set-hostname k8s-master01
[root@localhost ~]# bash
[root@k8s-master01 ~]#
[root@localhost ~]# hostnamectl set-hostname k8s-master02
[root@localhost ~]# bash
[root@k8s-master02 ~]#
[root@localhost ~]# hostnamectl set-hostname k8s-master03
[root@localhost ~]# bash
[root@k8s-master03 ~]#
[root@localhost ~]# hostnamectl set-hostname k8s-node01
[root@localhost ~]# bash
[root@k8s-node01 ~]#
[root@localhost ~]# hostnamectl set-hostname k8s-node02
[root@localhost ~]# bash
[root@k8s-node02 ~]#
所有节点配置hosts，修改/etc/hosts如下：
[root@k8s-master01 ~]# vi /etc/hosts
[root@k8s-master01 ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
10.0.0.100 k8s-master01
10.0.0.101 k8s-master02
10.0.0.102 k8s-master03
10.0.0.200 k8s-master-lb
10.0.0.103 k8s-node01
10.0.0.104 k8s-node02
所有节点关闭防火墙、selinux、dnsmasq、swap。服务器配置如下：
[root@k8s-master01 ~]# systemctl disable --now firewalld
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@k8s-master01 ~]# systemctl disable --now dnsmasq
Failed to disable unit: Unit file dnsmasq.service does not exist.
[root@k8s-master01 ~]# sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
[root@k8s-master01 ~]# sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
[root@k8s-master01 ~]# reboot
...
[root@k8s-master03 ~]# setenforce 0
setenforce: SELinux is disabled
[root@k8s-master01 ~]# sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab
[root@k8s-master01 ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Sat Jan 1 13:29:34 2022
#
# Accessible filesystems, by reference, are maintained under '/dev/disk/'.
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
/dev/mapper/cl-root / xfs defaults 0 0
UUID=011be562-0336-49cc-a85e-71e7a4ea93a8 /boot xfs defaults 0 0
/dev/mapper/cl-home /home xfs defaults 0 0
#/dev/mapper/cl-swap none swap defaults 0 0
[root@k8s-master01 ~]# swapoff -a && sysctl -w vm.swappiness=0
vm.swappiness = 0
安装ntpdate
[root@k8s-master01 ~]# rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
Retrieving http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
Verifying... ################################# [100%]
Preparing... ################################# [100%]
Updating / installing...
1:wlnmp-release-centos-2-1 ################################# [100%]
[root@k8s-master01 ~]# yum install wntp -y
CentOS Linux 8 - AppStream 6.5 MB/s | 8.4 MB 00:01
CentOS Linux 8 - BaseOS 107 kB/s | 4.6 MB 00:43
...
Installed:
wntp-4.2.8p15-1.el8.x86_64
Complete!
所有节点同步时间。时间同步配置如下：
[root@k8s-master01 ~]# ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
[root@k8s-master01 ~]# echo 'Asia/Shanghai' >/etc/timezone
[root@k8s-master01 ~]# ntpdate time2.aliyun.com
1 Jan 16:24:32 ntpdate[1179]: step time server 203.107.6.88 offset -28798.560596 sec
# 加入到crontab
[root@k8s-master01 ~]# crontab -e
no crontab for root - using an empty one
crontab: installing new crontab
[root@k8s-master01 ~]# crontab -l
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com
# 加入到开机自动同步，/etc/rc.local
[root@k8s-master01 ~]# ntpdate time2.aliyun.com
1 Jan 16:25:32 ntpdate[1184]: adjust time server 203.107.6.88 offset -0.000941 sec
[root@k8s-master01 ~]#
所有节点配置limit：
[root@k8s-master01 ~]# ulimit -SHn 65535
[root@k8s-master01 ~]# vi /etc/security/limits.conf
# 末尾添加如下内容
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
[root@k8s-master01 ~]# cat /etc/security/limits.conf
...
#@student - maxlogins 4
# End of file
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
Master01节点免密钥登录其他节点，安装过程中生成配置文件和证书均在Master01上操作，集群管理也在Master01上操作，阿里云或者AWS上需要单独一台kubectl服务器。密钥配置如下：
[root@k8s-master01 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:vfVM2Ko2K08tlgait/2qldXg1tf1jjPbXGGIooB5A1s root@k8s-master01
The key's randomart image is:
+---[RSA 3072]----+
| |
| |
| . E . .|
| * o +.o..o|
| + +. S.=.=.+oo|
| ..o..=.= *.o.|
| . ..o B o * o|
| . +.+oo *.|
| o.o*=o . o|
+----[SHA256]-----+
[root@k8s-master01 ~]# for i in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: ".ssh/id_rsa.pub"
The authenticity of host 'k8s-master01 (10.0.0.100)' can't be established.
ECDSA key fingerprint is SHA256:hiGOVC01QsC2Mno7Chucvj2lYf8vRIVrQ2AlMn96pxM.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@k8s-master01's password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh 'k8s-master01'"
and check to make sure that only the key(s) you wanted were added.
...
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: ".ssh/id_rsa.pub"
The authenticity of host 'k8s-node02 (10.0.0.104)' can't be established.
ECDSA key fingerprint is SHA256:qqhCI3qRQrs1+3jcovSkU947ZDcc7QEBiq9lUfVTfxs.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@k8s-node02's password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh 'k8s-node02'"
and check to make sure that only the key(s) you wanted were added.
在源码中的repo目录配置使用的是国内仓库源，将其复制到所有节点：
本次是提前下载好了，上传到所有节点
git clone https://github.com/dotbalo/k8s-ha-install.git
[root@k8s-master01 ~]# ls
anaconda-ks.cfg k8s-ha-install
CentOS 8 安装源如下：
[root@k8s-master01 ~]# curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 2595 100 2595 0 0 8034 0 --:--:-- --:--:-- --:--:-- 8034
[root@k8s-master01 ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
Repository extras is listed more than once in the configuration
CentOS-8 - Base - mirrors.aliyun.com 9.7 MB/s | 4.6 MB 00:00
CentOS-8 - Extras - mirrors.aliyun.com 34 kB/s | 10 kB 00:00
...
Upgraded:
device-mapper-8:1.02.177-10.el8.x86_64 device-mapper-event-8:1.02.177-10.el8.x86_64 device-mapper-event-libs-8:1.02.177-10.el8.x86_64 device-mapper-libs-8:1.02.177-10.el8.x86_64
device-mapper-persistent-data-0.9.0-4.el8.x86_64 dnf-plugins-core-4.0.21-3.el8.noarch lvm2-8:2.03.12-10.el8.x86_64 lvm2-libs-8:2.03.12-10.el8.x86_64
python3-dnf-plugins-core-4.0.21-3.el8.noarch
Installed:
yum-utils-4.0.21-3.el8.noarch
Complete!
[root@k8s-master01 ~]# yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
Repository extras is listed more than once in the configuration
Adding repo from: https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
[root@k8s-master01 ~]# cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
[root@k8s-master01 ~]# sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
[root@k8s-master01 ~]#
必备工具安装
[root@k8s-master01 ~]# yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 -y
Repository extras is listed more than once in the configuration
CentOS-8 - Base - mirrors.aliyun.com 21 kB/s | 3.9 kB 00:00
CentOS-8 - Extras - mirrors.aliyun.com 9.9 kB/s | 1.5 kB 00:00
...
telnet-1:0.17-76.el8.x86_64
vim-common-2:8.0.1763-16.el8.x86_64
vim-enhanced-2:8.0.1763-16.el8.x86_64
vim-filesystem-2:8.0.1763-16.el8.noarch
wget-1.19.5-10.el8.x86_64
Complete!
所有节点升级系统并重启，此处升级没有升级内核，下节会单独升级内核：
yum update -y --exclude=kernel* && reboot #CentOS7需要升级，8不需要
1.1.2 内核配置
CentOS7 需要升级内核至4.18+
https://www.kernel.org/ 和 https://elrepo.org/linux/kernel/el7/x86_64/
CentOS 7 dnf可能无法安装内核
dnf --disablerepo=\* --enablerepo=elrepo -y install kernel-ml kernel-ml-devel
grubby --default-kernel
使用如下方式安装最新版内核
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
查看最新版内核yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
[root@k8s-node01 ~]# yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* elrepo-kernel: mirrors.neusoft.edu.cn
elrepo-kernel | 2.9 kB 00:00:00
elrepo-kernel/primary_db | 1.9 MB 00:00:00
Available Packages
elrepo-release.noarch 7.0-5.el7.elrepo elrepo-kernel
kernel-lt.x86_64 4.4.229-1.el7.elrepo elrepo-kernel
kernel-lt-devel.x86_64 4.4.229-1.el7.elrepo elrepo-kernel
kernel-lt-doc.noarch 4.4.229-1.el7.elrepo elrepo-kernel
kernel-lt-headers.x86_64 4.4.229-1.el7.elrepo elrepo-kernel
kernel-lt-tools.x86_64 4.4.229-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs.x86_64 4.4.229-1.el7.elrepo elrepo-kernel
kernel-lt-tools-libs-devel.x86_64 4.4.229-1.el7.elrepo elrepo-kernel
kernel-ml.x86_64 5.7.7-1.el7.elrepo elrepo-kernel
kernel-ml-devel.x86_64 5.7.7-1.el7.elrepo elrepo-kernel
kernel-ml-doc.noarch 5.7.7-1.el7.elrepo elrepo-kernel
kernel-ml-headers.x86_64 5.7.7-1.el7.elrepo elrepo-kernel
kernel-ml-tools.x86_64 5.7.7-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs.x86_64 5.7.7-1.el7.elrepo elrepo-kernel
kernel-ml-tools-libs-devel.x86_64 5.7.7-1.el7.elrepo elrepo-kernel
perf.x86_64 5.7.7-1.el7.elrepo elrepo-kernel
python-perf.x86_64 5.7.7-1.el7.elrepo elrepo-kernel
安装最新版：
yum --enablerepo=elrepo-kernel install kernel-ml kernel-ml-devel -y
安装完成后reboot
更改内核顺序：
grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg && grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)" && reboot
开机后查看内核
[appadmin@k8s-node01 ~]$ uname -a
Linux k8s-node01 5.7.7-1.el7.elrepo.x86_64 #1 SMP Wed Jul 1 11:53:16 EDT 2020 x86_64 x86_64 x86_64 GNU/Linux
CentOS 8按需升级:
可以采用dnf升级，也可使用上述同样步骤升级（使用上述步骤注意elrepo-release-8.1版本）
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
dnf install https://www.elrepo.org/elrepo-release-8.1-1.el8.elrepo.noarch.rpm
dnf --disablerepo=\* --enablerepo=elrepo -y install kernel-ml kernel-ml-devel
grubby --default-kernel && reboot
本所有节点安装ipvsadm：
[root@k8s-master01 ~]# yum install ipvsadm ipset sysstat conntrack libseccomp -y
Repository extras is listed more than once in the configuration
Last metadata expiration check: -1 day, 16:38:19 ago on Sun 02 Jan 2022 12:20:14 AM CST.
Package ipset-7.1-1.el8.x86_64 is already installed.
Package libseccomp-2.5.1-1.el8.x86_64 is already installed.
...
Installed:
conntrack-tools-1.4.4-10.el8.x86_64 ipvsadm-1.31-1.el8.x86_64
libnetfilter_cthelper-1.0.0-15.el8.x86_64 libnetfilter_cttimeout-1.0.0-11.el8.x86_64
libnetfilter_queue-1.0.4-3.el8.x86_64 lm_sensors-libs-3.4.0-23.20180522git70f7e08.el8.x86_64
sysstat-11.7.3-6.el8.x86_64
Complete!
所有节点配置ipvs模块，在内核4.19+版本nf_conntrack_ipv4已经改为nf_conntrack，本例安装的内核为4.18，使用nf_conntrack_ipv4即可：
[root@k8s-master01 ~]# modprobe -- ip_vs
[root@k8s-master01 ~]# modprobe -- ip_vs_rr
[root@k8s-master01 ~]# modprobe -- ip_vs_wrr
[root@k8s-master01 ~]# modprobe -- ip_vs_sh
[root@k8s-master01 ~]# modprobe -- nf_conntrack_ipv4
modprobe: FATAL: Module nf_conntrack_ipv4 not found in directory /lib/modules/4.18.0-305.3.1.el8.x86_64
[root@k8s-master01 ~]# modprobe -- nf_conntrack
[root@k8s-master01 ~]# vim /etc/modules-load.d/ipvs.conf
[root@k8s-master01 ~]# cat /etc/modules-load.d/ipvs.conf
# 加入以下内容
ip_vs
ip_vs_lc
ip_vs_wlc
ip_vs_rr
ip_vs_wrr
ip_vs_lblc
ip_vs_lblcr
ip_vs_dh
ip_vs_sh
ip_vs_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
然后执行systemctl enable --now systemd-modules-load.service即可
[root@k8s-master01 ~]# systemctl enable --now systemd-modules-load.service
The unit files have no installation config (WantedBy, RequiredBy, Also, Alias
settings in the [Install] section, and DefaultInstance for template units).
This means they are not meant to be enabled using systemctl.
Possible reasons for having this kind of units are:
1) A unit may be statically enabled by being symlinked from another unit's
.wants/ or .requires/ directory.
2) A unit's purpose may be to act as a helper for some other unit which has
a requirement dependency on it.
3) A unit may be started when needed via activation (socket, path, timer,
D-Bus, udev, scripted systemctl call, ...).
4) In case of template units, the unit is meant to be enabled with some
instance name specified.
检查是否加载：
[root@k8s-master01 ~]# lsmod | grep -e ip_vs -e nf_conntrack_ipv4
ip_vs_sh 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 0
ip_vs 172032 6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack 172032 1 ip_vs
nf_defrag_ipv6 20480 2 nf_conntrack,ip_vs
libcrc32c 16384 3 nf_conntrack,xfs,ip_vs
[root@k8s-master01 ~]# lsmod | grep -e ip_vs -e nf_conntrack
ip_vs_sh 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 0
ip_vs 172032 6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack 172032 1 ip_vs
nf_defrag_ipv6 20480 2 nf_conntrack,ip_vs
nf_defrag_ipv4 16384 1 nf_conntrack
libcrc32c 16384 3 nf_conntrack,xfs,ip_vs
开启一些k8s集群中必须的内核参数，所有节点配置k8s内核：
[root@k8s-master01 ~]# cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
[root@k8s-master01 ~]# sysctl --system
* Applying /usr/lib/sysctl.d/10-default-yama-scope.conf ...
kernel.yama.ptrace_scope = 0
* Applying /usr/lib/sysctl.d/50-coredump.conf ...
kernel.core_pattern = |/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h %e
* Applying /usr/lib/sysctl.d/50-default.conf ...
kernel.sysrq = 16
kernel.core_uses_pid = 1
kernel.kptr_restrict = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.promote_secondaries = 1
net.core.default_qdisc = fq_codel
fs.protected_hardlinks = 1
fs.protected_symlinks = 1
* Applying /usr/lib/sysctl.d/50-libkcapi-optmem_max.conf ...
net.core.optmem_max = 81920
* Applying /usr/lib/sysctl.d/50-pid-max.conf ...
kernel.pid_max = 4194304
* Applying /etc/sysctl.d/99-sysctl.conf ...
* Applying /etc/sysctl.d/k8s.conf ...
net.ipv4.ip_forward = 1
vm.overcommit_memory = 1
vm.panic_on_oom = 0
fs.inotify.max_user_watches = 89100
fs.file-max = 52706963
fs.nr_open = 52706963
net.netfilter.nf_conntrack_max = 2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl = 15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
* Applying /etc/sysctl.conf ...
所有节点配置完内核后，重启服务器，保证重启后内核依旧加载
[root@k8s-master01 ~]# reboot
...
[root@k8s-master01 ~]# lsmod | grep --color=auto -e ip_vs -e nf_conntrack
ip_vs_ftp 16384 0
nf_nat 45056 1 ip_vs_ftp
ip_vs_sed 16384 0
ip_vs_nq 16384 0
ip_vs_fo 16384 0
ip_vs_sh 16384 0
ip_vs_dh 16384 0
ip_vs_lblcr 16384 0
ip_vs_lblc 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 0
ip_vs_wlc 16384 0
ip_vs_lc 16384 0
ip_vs 172032 24 ip_vs_wlc,ip_vs_rr,ip_vs_dh,ip_vs_lblcr,ip_vs_sh,ip_vs_fo,ip_vs_nq,ip_vs_lblc,ip_vs_wrr,ip_vs_lc,ip_vs_sed,ip_vs_ftp
nf_conntrack 172032 2 nf_nat,ip_vs
nf_defrag_ipv6 20480 2 nf_conntrack,ip_vs
nf_defrag_ipv4 16384 1 nf_conntrack
libcrc32c 16384 4 nf_conntrack,nf_nat,xfs,ip_vs
1.1.3 基本组件安装
本节主要安装的是集群中用到的各种组件，比如Docker-ce、Kubernetes各组件等。
查看可用docker-ce版本：
[root@k8s-master01 ~]# yum list docker-ce.x86_64 --showduplicates | sort -r
Repository extras is listed more than once in the configuration
Last metadata expiration check: 0:57:48 ago on Sun 02 Jan 2022 12:20:14 AM CST.
docker-ce.x86_64 3:20.10.9-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.8-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.7-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.6-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.5-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.4-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.3-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.2-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.1-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.12-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.11-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.10-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.0-3.el8 docker-ce-stable
docker-ce.x86_64 3:19.03.15-3.el8 docker-ce-stable
docker-ce.x86_64 3:19.03.14-3.el8 docker-ce-stable
docker-ce.x86_64 3:19.03.13-3.el8 docker-ce-stable
Available Packages
安装最新版本的Docker
[root@k8s-master01 ~]# yum install docker-ce -y
Repository extras is listed more than once in the configuration
Last metadata expiration check: 1:00:16 ago on Sun 02 Jan 2022 12:20:14 AM CST.
Dependencies resolved.
===========================================================================================================================================================================================================
Package Architecture Version Repository Size
===========================================================================================================================================================================================================
Installing:
docker-ce x86_64 3:20.10.12-3.el8 docker-ce-stable 22 M
...
Upgraded:
policycoreutils-2.9-16.el8.x86_64
Installed:
checkpolicy-2.9-1.el8.x86_64 container-selinux-2:2.167.0-1.module_el8.5.0+911+f19012f9.noarch containerd.io-1.4.12-3.1.el8.x86_64
docker-ce-3:20.10.12-3.el8.x86_64 docker-ce-cli-1:20.10.12-3.el8.x86_64 docker-ce-rootless-extras-20.10.12-3.el8.x86_64
docker-scan-plugin-0.12.0-3.el8.x86_64 fuse-overlayfs-1.7.1-1.module_el8.5.0+890+6b136101.x86_64 fuse3-3.2.1-12.el8.x86_64
fuse3-libs-3.2.1-12.el8.x86_64 libcgroup-0.41-19.el8.x86_64 libslirp-4.4.0-1.module_el8.5.0+890+6b136101.x86_64
policycoreutils-python-utils-2.9-16.el8.noarch python3-audit-3.0-0.17.20191104git1c2f876.el8.x86_64 python3-libsemanage-2.9-6.el8.x86_64
python3-policycoreutils-2.9-16.el8.noarch python3-setools-4.3.0-2.el8.x86_64 slirp4netns-1.1.8-1.module_el8.5.0+890+6b136101.x86_64
Complete!
可能会遇到的问题
[root@k8s-master01 k8s-ha-install]# wget https://download.docker.com/linux/centos/7/x86_64/edge/Packages/containerd.io-1.2.13-3.2.el7.x86_64.rpm
[root@k8s-master01 k8s-ha-install]# yum install containerd.io-1.2.13-3.2.el7.x86_64.rpm -y
安装指定版本的Docker：
yum -y install docker-ce-17.09.1.ce-1.el7.centos
温馨提示：
由于新版kubelet建议使用systemd，所以可以把docker的CgroupDriver改成systemd
cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"]
}
EOF
安装k8s组件：
[root@k8s-master01 ~]# yum list kubeadm.x86_64 --showduplicates | sort -r
Repository extras is listed more than once in the configuration
Last metadata expiration check: 1:09:19 ago on Sun 02 Jan 2022 12:20:14 AM CST.
kubeadm.x86_64 1.9.9-0 kubernetes
...
kubeadm.x86_64 1.23.1-0 kubernetes
kubeadm.x86_64 1.23.0-0 kubernetes
kubeadm.x86_64 1.22.5-0 kubernetes
kubeadm.x86_64 1.22.4-0 kubernetes
kubeadm.x86_64 1.22.3-0 kubernetes
...
所有节点安装最新版本kubeadm：
[root@k8s-master01 ~]# yum install kubeadm -y
Repository extras is listed more than once in the configuration
Last metadata expiration check: 1:11:16 ago on Sun 02 Jan 2022 12:20:14 AM CST.
Dependencies resolved.
===================================================================================================
Package Architecture Version Repository Size
===================================================================================================
Installing:
kubeadm x86_64 1.23.1-0 kubernetes 9.0 M
Installing dependencies:
cri-tools x86_64 1.19.0-0 kubernetes 5.7 M
kubectl x86_64 1.23.1-0 kubernetes 9.5 M
kubelet x86_64 1.23.1-0 kubernetes 21 M
kubernetes-cni x86_64 0.8.7-0 kubernetes 19 M
socat x86_64 1.7.4.1-1.el8 AppStream 323 k
Transaction Summary
===================================================================================================
Install 6 Packages
...
Installed:
cri-tools-1.19.0-0.x86_64 kubeadm-1.23.1-0.x86_64 kubectl-1.23.1-0.x86_64
kubelet-1.23.1-0.x86_64 kubernetes-cni-0.8.7-0.x86_64 socat-1.7.4.1-1.el8.x86_64
Complete!
所有节点安装指定版本k8s组件：
yum install -y kubeadm-1.12.3-0.x86_64 kubectl-1.12.3-0.x86_64 kubelet-1.12.3-0.x86_64
所有节点设置开机自启动Docker：
[root@k8s-master01 ~]# systemctl daemon-reload && systemctl enable --now docker
Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service.
所有节点查看docker启动情况，最后面一定要没有告警和报错才可
[root@k8s-master01 ~]# docker info
Client:
Context: default
Debug Mode: false
Plugins:
app: Docker App (Docker Inc., v0.9.1-beta3)
buildx: Docker Buildx (Docker Inc., v0.7.1-docker)
scan: Docker Scan (Docker Inc., v0.12.0)
Server:
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 0
Server Version: 20.10.12
Storage Driver: overlay2
Backing Filesystem: xfs
Supports d_type: true
Native Overlay Diff: true
userxattr: false
Logging Driver: json-file
Cgroup Driver: cgroupfs
Cgroup Version: 1
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 7b11cfaabd73bb80907dd23182b9347b4245eb5d
runc version: v1.0.2-0-g52b36a2
init version: de40ad0
Security Options:
seccomp
Profile: default
Kernel Version: 4.18.0-305.3.1.el8.x86_64
Operating System: CentOS Linux 8
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 1.905GiB
Name: k8s-master01
ID: WTOL:FBKY:MYQY:5O32:2MUV:KFFW:CVXJ:FASZ:YPJB:YNOQ:MYZ3:GEC7
Docker Root Dir: /var/lib/docker
Debug Mode: false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
默认配置的pause镜像使用gcr.io仓库，国内可能无法访问，所以这里配置Kubelet使用阿里云的pause镜像：
[root@k8s-master01 ~]# DOCKER_CGROUPS=$(docker info | grep 'Cgroup' | cut -d' ' -f4)
[root@k8s-master01 ~]# echo $DOCKER_CGROUPS
cgroupfs 1
[root@k8s-master01 ~]# cat >/etc/sysconfig/kubelet<<EOF
KUBELET_EXTRA_ARGS="--cgroup-driver=cgroupfs --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1"
EOF
[root@k8s-node02 ~]# cat /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="--cgroup-driver=cgroupfs --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1"
设置Kubelet开机自启动：
[root@k8s-master01 ~]# systemctl daemon-reload
[root@k8s-master01 ~]# systemctl enable --now kubelet
Created symlink /etc/systemd/system/multi-user.target.wants/kubelet.service → /usr/lib/systemd/system/kubelet.service.
1.1.4 高可用组件安装
所有Master节点通过yum安装HAProxy和KeepAlived：
[root@k8s-master01 ~]# yum install keepalived haproxy -y
Repository extras is listed more than once in the configuration
Last metadata expiration check: 1:33:58 ago on Sun 02 Jan 2022 12:20:14 AM CST.
Dependencies resolved.
===================================================================================================
Package Architecture Version Repository Size
===================================================================================================
Installing:
haproxy x86_64 1.8.27-2.el8 AppStream 1.4 M
keepalived x86_64 2.1.5-6.el8 AppStream 537 k
Installing dependencies:
mariadb-connector-c x86_64 3.1.11-2.el8_3 AppStream 200 k
mariadb-connector-c-config noarch 3.1.11-2.el8_3 AppStream 15 k
net-snmp-agent-libs x86_64 1:5.8-22.el8 AppStream 748 k
net-snmp-libs x86_64 1:5.8-22.el8 base 827 k
Transaction Summary
===================================================================================================
Install 6 Packages
...
Installed:
haproxy-1.8.27-2.el8.x86_64 keepalived-2.1.5-6.el8.x86_64
mariadb-connector-c-3.1.11-2.el8_3.x86_64 mariadb-connector-c-config-3.1.11-2.el8_3.noarch
net-snmp-agent-libs-1:5.8-22.el8.x86_64 net-snmp-libs-1:5.8-22.el8.x86_64
Complete!
所有Master节点配置HAProxy（详细配置参考HAProxy文档，所有Master节点的HAProxy配置相同）：
[root@k8s-master01 ~]# cd /etc/haproxy/
[root@k8s-master01 haproxy]# ls
haproxy.cfg
[root@k8s-master01 haproxy]# mv haproxy.cfg haproxy.cfg.bak
[root@k8s-master01 haproxy]# vi haproxy.cfg
[root@k8s-master01 haproxy]# cat haproxy.cfg
global
maxconn 2000
ulimit-n 16384
log 127.0.0.1 local0 err
stats timeout 30s
defaults
log global
mode http
option httplog
timeout connect 5000
timeout client 50000
timeout server 50000
timeout http-request 15s
timeout http-keep-alive 15s
frontend monitor-in
bind *:33305
mode http
option httplog
monitor-uri /monitor
frontend k8s-master
bind 0.0.0.0:16443
bind 127.0.0.1:16443
mode tcp
option tcplog
tcp-request inspect-delay 5s
default_backend k8s-master
backend k8s-master
mode tcp
option tcplog
option tcp-check
balance roundrobin
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
server k8s-master01 10.0.0.100:6443 check
server k8s-master02 10.0.0.101:6443 check
server k8s-master03 10.0.0.102:6443 check
所有Master节点配置KeepAlived，配置不一样；
注意区分 [root@k8s-master01 pki]# vim /etc/keepalived/keepalived.conf 。
注意每个节点的IP和网卡（interface参数）
Master01节点的配置：
[root@k8s-master01 haproxy]# cd /etc/keepalived/
[root@k8s-master01 keepalived]# ls
keepalived.conf
[root@k8s-master01 keepalived]# mv keepalived.conf keepalived.conf.bak
[root@k8s-master01 keepalived]# vi keepalived.conf
[root@k8s-master01 keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface ens160
mcast_src_ip 10.0.0.100
virtual_router_id 51
priority 101
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
10.0.0.200
}
# track_script {
# chk_apiserver
# }
}
Master02节点的配置：
[root@k8s-master02 ~]# cd /etc/keepalived/
[root@k8s-master02 keepalived]# ls
keepalived.conf
[root@k8s-master02 keepalived]# mv keepalived.conf keepalived.conf.bak
[root@k8s-master02 keepalived]# vi keepalived.conf
[root@k8s-master02 keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface ens160
mcast_src_ip 10.0.0.101
virtual_router_id 51
priority 100
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
10.0.0.200
}
# track_script {
# chk_apiserver
# }
}
Master03节点的配置：
[root@k8s-master03 ~]# cd /etc/keepalived/
[root@k8s-master03 keepalived]# ls
keepalived.conf
[root@k8s-master03 keepalived]# mv keepalived.conf keepalived.conf.bak
[root@k8s-master03 keepalived]# vi keepalived.conf
[root@k8s-master03 keepalived]# cat keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface ens160
mcast_src_ip 10.0.0.102
virtual_router_id 51
priority 100
nopreempt
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
10.0.0.200
}
# track_script {
# chk_apiserver
# }
}
注意上述的健康检查是关闭的，集群建立完成后再开启：
# track_script {
# chk_apiserver
# }
所有master节点配置KeepAlived健康检查文件：
[root@k8s-master01 keepalived]# vi /etc/keepalived/check_apiserver.sh
[root@k8s-master01 keepalived]# cat /etc/keepalived/check_apiserver.sh
#!/bin/bash
err=0
for k in $(seq 1 3)
do
check_code=$(pgrep haproxy)
if [[ $check_code == "" ]]; then
err=$(expr $err + 1)
sleep 1
continue
else
err=0
break
fi
done
if [[ $err != "0" ]]; then
echo "systemctl stop keepalived"
/usr/bin/systemctl stop keepalived
exit 1
else
exit 0
fi
[root@k8s-master01 keepalived]# chmod +x /etc/keepalived/check_apiserver.sh
[root@k8s-master01 keepalived]#
所有的master节点启动haproxy和keepalived
[root@k8s-master01 keepalived]# systemctl enable --now haproxy
Created symlink /etc/systemd/system/multi-user.target.wants/haproxy.service → /usr/lib/systemd/system/haproxy.service.
[root@k8s-master01 keepalived]# systemctl enable --now keepalived
Created symlink /etc/systemd/system/multi-user.target.wants/keepalived.service → /usr/lib/systemd/system/keepalived.service.
重要：如果安装了keepalived和haproxy，需要测试keepalived是否是正常的
#可以看到虚IP在master01上面
[root@k8s-master01 keepalived]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:0c:29:64:93:f2 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.100/24 brd 10.0.0.255 scope global noprefixroute ens160
valid_lft forever preferred_lft forever
inet 10.0.0.200/32 scope global ens160
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe64:93f2/64 scope link noprefixroute
valid_lft forever preferred_lft forever
...
#在别的节点上面ping虚IP的地址看能不能通
[root@k8s-master02 keepalived]# ping 10.0.0.200
PING 10.0.0.200 (10.0.0.200) 56(84) bytes of data.
64 bytes from 10.0.0.200: icmp_seq=1 ttl=64 time=0.698 ms
64 bytes from 10.0.0.200: icmp_seq=2 ttl=64 time=0.417 ms
^C
--- 10.0.0.200 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1027ms
rtt min/avg/max/mdev = 0.417/0.557/0.698/0.142 ms
telnet 10.0.0.200 16443
如果ping不通且telnet没有出现 ]，则认为VIP不可以，不可在继续往下执行，需要排查keepalived的问题，比如防火墙和selinux，haproxy和keepalived的状态，监听端口等
所有节点查看防火墙状态必须为disable和inactive：systemctl status firewalld
所有节点查看selinux状态，必须为disable：getenforce
master节点查看haproxy和keepalived状态：systemctl status keepalived haproxy
master节点查看监听端口：netstat -lntp
官方地址：https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/
各Master节点的kubeadm-config.yaml配置文件如下：
Master01：
daocloud.io/daocloud
[root@k8s-master01 ~]# vi kubeadm-config.yaml
[root@k8s-master01 ~]# cat kubeadm-config.yaml
apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
- system:bootstrappers:kubeadm:default-node-token
token: 7t2weq.bjbawausm0jaxury
ttl: 24h0m0s
usages:
- signing
- authentication
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: 10.0.0.100
bindPort: 6443
nodeRegistration:
criSocket: /var/run/dockershim.sock
name: k8s-master01
taints:
- effect: NoSchedule
key: node-role.kubernetes.io/master
---
apiServer:
certSANs:
- 10.0.0.200
timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: 10.0.0.200:16443
controllerManager: {}
dns:
type: CoreDNS
etcd:
local:
dataDir: /var/lib/etcd
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.23.1
networking:
dnsDomain: cluster.local
podSubnet: 172.168.0.0/16
serviceSubnet: 10.96.0.0/12
scheduler: {}
更新kubeadm文件
kubeadm config migrate --old-config kubeadm-config.yaml --new-config new.yaml
所有Master节点提前下载镜像，可以节省初始化时间：
[root@k8s-master01 ~]# kubeadm config images pull --config /root/kubeadm-config.yaml
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.23.1
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.23.1
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.23.1
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.23.1
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.6
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.5.1-0
[config/images] Pulled registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:v1.8.6
[root@k8s-master01 ~]#
所有节点设置开机自启动kubelet
systemctl enable --now kubelet
Master01节点初始化，初始化以后会在/etc/kubernetes目录下生成对应的证书和配置文件，之后其他Master节点加入Master01即可：
[root@k8s-master01 ~]# kubeadm init --config /root/kubeadm-config.yaml --upload-certs
[init] Using Kubernetes version: v1.23.1
[preflight] Running pre-flight checks
[WARNING FileExisting-tc]: tc not found in system path
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [k8s-master01 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 10.0.0.100 10.0.0.200]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [k8s-master01 localhost] and IPs [10.0.0.100 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [k8s-master01 localhost] and IPs [10.0.0.100 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "admin.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[kubelet-check] Initial timeout of 40s passed.
[apiclient] All control plane components are healthy after 51.922117 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.23" in namespace kube-system with the configuration for the kubelets in the cluster
NOTE: The "kubelet-config-1.23" naming of the kubelet ConfigMap is deprecated. Once the UnversionedKubeletConfigMap feature gate graduates to Beta the default name will become just "kubelet-config". Kubeadm upgrade will handle this transition transparently.
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
ecef976dec14d9ea041938ee3e1dee670fee35041fa91258424d50973784ff02
[mark-control-plane] Marking the node k8s-master01 as control-plane by adding the labels: [node-role.kubernetes.io/master(deprecated) node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
[mark-control-plane] Marking the node k8s-master01 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: 7t2weq.bjbawausm0jaxury
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
[addons] Applied essential addon: CoreDNS
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[addons] Applied essential addon: kube-proxy
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Alternatively, if you are the root user, you can run:
export KUBECONFIG=/etc/kubernetes/admin.conf
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
You can now join any number of the control-plane node running the following command on each as root:
kubeadm join 10.0.0.200:16443 --token 7t2weq.bjbawausm0jaxury \
--discovery-token-ca-cert-hash sha256:6a259f0b91a7412345ee5c182db413a61b5afc93a411e7b949fbc297201594cf \
--control-plane --certificate-key ecef976dec14d9ea041938ee3e1dee670fee35041fa91258424d50973784ff02
Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 10.0.0.200:16443 --token 7t2weq.bjbawausm0jaxury \
--discovery-token-ca-cert-hash sha256:6a259f0b91a7412345ee5c182db413a61b5afc93a411e7b949fbc297201594cf
[root@k8s-master01 ~]# mkdir -p $HOME/.kube
[root@k8s-master01 ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@k8s-master01 ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
[root@k8s-master01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master01 NotReady control-plane,master 4m15s v1.23.1
k8s-master02 NotReady control-plane,master 3m15s v1.23.1
k8s-master03 NotReady control-plane,master 2m23s v1.23.1
k8s-node01 NotReady <none> 103s v1.23.1
k8s-node02 NotReady <none> 70s v1.23.1
[root@k8s-master01 ~]# kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-65c54cc984-dzwtd 0/1 Pending 0 3m15s
coredns-65c54cc984-gl9qp 0/1 Pending 0 3m15s
etcd-k8s-master01 1/1 Running 0 3m28s
kube-apiserver-k8s-master01 1/1 Running 0 3m28s
kube-controller-manager-k8s-master01 1/1 Running 0 3m28s
kube-proxy-gwdsv 1/1 Running 0 3m15s
kube-scheduler-k8s-master01 1/1 Running 0 3m28s
....
[root@k8s-master01 ~]# tail -f /var/log/messages
Jan 2 04:45:43 k8s-master01 kubelet[12498]: I0102 04:45:43.259976 12498 cni.go:240] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
Jan 2 04:45:45 k8s-master01 kubelet[12498]: E0102 04:45:45.695262 12498 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"
Jan 2 04:45:48 k8s-master01 kubelet[12498]: I0102 04:45:48.261617 12498 cni.go:240] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
Jan 2 04:45:50 k8s-master01 kubelet[12498]: E0102 04:45:50.702817 12498 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"
Jan 2 04:45:53 k8s-master01 kubelet[12498]: I0102 04:45:53.262294 12498 cni.go:240] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
Jan 2 04:45:55 k8s-master01 kubelet[12498]: E0102 04:45:55.711591 12498 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"
Jan 2 04:45:58 k8s-master01 kubelet[12498]: I0102 04:45:58.263726 12498 cni.go:240] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
Jan 2 04:46:00 k8s-master01 kubelet[12498]: E0102 04:46:00.726013 12498 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"
Jan 2 04:46:03 k8s-master01 kubelet[12498]: I0102 04:46:03.265447 12498 cni.go:240] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
Jan 2 04:46:05 k8s-master01 kubelet[12498]: E0102 04:46:05.734212 12498 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"
Jan 2 04:46:08 k8s-master01 kubelet[12498]: I0102 04:46:08.265555 12498 cni.go:240] "Unable to update cni config" err="no networks found in /etc/cni/net.d"
Jan 2 04:46:10 k8s-master01 kubelet[12498]: E0102 04:46:10.742864 12498 kubelet.go:2347] "Container runtime network not ready" networkReady="NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized"
^C
不用配置文件初始化：
kubeadm init --control-plane-endpoint "LOAD_BALANCER_DNS:LOAD_BALANCER_PORT" --upload-certs
如果初始化失败，重置后再次初始化，命令如下：
kubeadm reset
初始化成功以后，会产生Token值，用于其他节点加入时使用，因此要记录下初始化成功生成的token值（令牌值）：
所有Master节点配置环境变量，用于访问Kubernetes集群：
cat <<EOF >> /root/.bashrc
export KUBECONFIG=/etc/kubernetes/admin.conf
EOF
source /root/.bashrc
查看节点状态：
[root@k8s-master01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master01 NotReady master 14m v1.12.3
采用初始化安装方式，所有的系统组件均以容器的方式运行并且在kube-system命名空间内，此时可以查看Pod状态：
[root@k8s-master01 ~]# kubectl get pods -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE
coredns-777d78ff6f-kstsz 0/1 Pending 0 14m
coredns-777d78ff6f-rlfr5 0/1 Pending 0 14m
etcd-k8s-master01 1/1 Running 0 14m 10.0.0.100 k8s-master01
kube-apiserver-k8s-master01 1/1 Running 0 13m 10.0.0.100 k8s-master01
kube-controller-manager-k8s-master01 1/1 Running 0 13m 10.0.0.100 k8s-master01
kube-proxy-8d4qc 1/1 Running 0 14m 10.0.0.100 k8s-master01
kube-scheduler-k8s-master01 1/1 Running 0 13m 10.0.0.100 k8s-master01
1.1.5 Calico组件的安装
下载calico的yaml文件到master01节点上
[root@k8s-master01 ~]# curl https://docs.projectcalico.org/manifests/calico.yaml -O
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 212k 100 212k 0 0 26954 0 0:00:08 0:00:08 --:--:-- 47391
[root@k8s-master01 ~]# vim calico.yaml
...
# 修改这两行
- name: CALICO_IPV4POOL_CIDR
value: "172.168.0.0/16"
...
[root@k8s-master01 ~]# kubectl apply -f calico.yaml
configmap/calico-config created
customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/caliconodestatuses.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipreservations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/kubecontrollersconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created
clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrole.rbac.authorization.k8s.io/calico-node created
clusterrolebinding.rbac.authorization.k8s.io/calico-node created
daemonset.apps/calico-node created
serviceaccount/calico-node created
deployment.apps/calico-kube-controllers created
serviceaccount/calico-kube-controllers created
Warning: policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
poddisruptionbudget.policy/calico-kube-controllers created
[root@k8s-master01 ~]# kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-647d84984b-lfnj5 0/1 Pending 0 100s
calico-node-glmkj 0/1 Init:1/3 0 100s
coredns-65c54cc984-dzwtd 0/1 Pending 0 19m
coredns-65c54cc984-gl9qp 0/1 Pending 0 19m
etcd-k8s-master01 1/1 Running 0 19m
kube-apiserver-k8s-master01 1/1 Running 0 19m
kube-controller-manager-k8s-master01 1/1 Running 0 19m
kube-proxy-gwdsv 1/1 Running 0 19m
kube-scheduler-k8s-master01 1/1 Running 0 19m
[root@k8s-master01 ~]# kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-647d84984b-lfnj5 0/1 ContainerCreating 0 2m43s
calico-node-glmkj 0/1 Init:2/3 0 2m43s
coredns-65c54cc984-dzwtd 0/1 ContainerCreating 0 20m
coredns-65c54cc984-gl9qp 0/1 ContainerCreating 0 20m
etcd-k8s-master01 1/1 Running 0 20m
kube-apiserver-k8s-master01 1/1 Running 0 20m
kube-controller-manager-k8s-master01 1/1 Running 0 20m
kube-proxy-gwdsv 1/1 Running 0 20m
kube-scheduler-k8s-master01 1/1 Running 0 20m
[root@k8s-master01 ~]# kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-647d84984b-lfnj5 0/1 ContainerCreating 0 7m41s
calico-node-glmkj 1/1 Running 0 7m41s
coredns-65c54cc984-dzwtd 1/1 Running 0 25m
coredns-65c54cc984-gl9qp 1/1 Running 0 25m
etcd-k8s-master01 1/1 Running 0 25m
kube-apiserver-k8s-master01 1/1 Running 0 25m
kube-controller-manager-k8s-master01 1/1 Running 0 25m
kube-proxy-gwdsv 1/1 Running 0 25m
kube-scheduler-k8s-master01 1/1 Running 0 25m
[root@k8s-master01 ~]# kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-647d84984b-lfnj5 1/1 Running 0 10m
calico-node-glmkj 1/1 Running 0 10m
coredns-65c54cc984-dzwtd 1/1 Running 0 28m
coredns-65c54cc984-gl9qp 1/1 Running 0 28m
etcd-k8s-master01 1/1 Running 0 28m
kube-apiserver-k8s-master01 1/1 Running 0 28m
kube-controller-manager-k8s-master01 1/1 Running 0 28m
kube-proxy-gwdsv 1/1 Running 0 28m
kube-scheduler-k8s-master01 1/1 Running 0 28m
注意：如果国内用户下载Calico较慢，所有节点可以配置加速器(如果该文件有其他配置，别忘了加上去)
vim /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"],
"registry-mirrors": [
"https://registry.docker-cn.com",
"http://hub-mirror.c.163.com",
"https://docker.mirrors.ustc.edu.cn"
]
}
systemctl daemon-reload
systemctl restart docker
Calico：https://www.projectcalico.org/
https://docs.projectcalico.org/getting-started/kubernetes/self-managed-onprem/onpremises
1.1.6 高可用Master
[root@k8s-master01 ~]# kubectl get secret -n kube-system
NAME TYPE DATA AGE
attachdetach-controller-token-lzrnd kubernetes.io/service-account-token 3 28m
bootstrap-signer-token-hzgrs kubernetes.io/service-account-token 3 28m
bootstrap-token-7t2weq bootstrap.kubernetes.io/token 6 28m
bootstrap-token-9yqdd5 bootstrap.kubernetes.io/token 4 28m
calico-kube-controllers-token-xxxmn kubernetes.io/service-account-token 3 11m
calico-node-token-q264q kubernetes.io/service-account-token 3 11m
certificate-controller-token-xjcls kubernetes.io/service-account-token 3 28m
clusterrole-aggregation-controller-token-vdhnt kubernetes.io/service-account-token 3 28m
coredns-token-ndkm2 kubernetes.io/service-account-token 3 28m
cronjob-controller-token-9s4hg kubernetes.io/service-account-token 3 28m
daemon-set-controller-token-fv8rs kubernetes.io/service-account-token 3 28m
default-token-5wnhm kubernetes.io/service-account-token 3 28m
deployment-controller-token-6bl57 kubernetes.io/service-account-token 3 28m
disruption-controller-token-xvtv7 kubernetes.io/service-account-token 3 28m
endpoint-controller-token-gc8qs kubernetes.io/service-account-token 3 28m
endpointslice-controller-token-tkfm9 kubernetes.io/service-account-token 3 28m
endpointslicemirroring-controller-token-k66nr kubernetes.io/service-account-token 3 28m
ephemeral-volume-controller-token-4tzxh kubernetes.io/service-account-token 3 28m
expand-controller-token-hztsb kubernetes.io/service-account-token 3 28m
generic-garbage-collector-token-9zmrv kubernetes.io/service-account-token 3 28m
horizontal-pod-autoscaler-token-h6ct5 kubernetes.io/service-account-token 3 28m
job-controller-token-bsh9b kubernetes.io/service-account-token 3 28m
kube-proxy-token-j45xs kubernetes.io/service-account-token 3 28m
kubeadm-certs Opaque 8 28m
namespace-controller-token-tmt8l kubernetes.io/service-account-token 3 28m
node-controller-token-j444g kubernetes.io/service-account-token 3 28m
persistent-volume-binder-token-2v79v kubernetes.io/service-account-token 3 28m
pod-garbage-collector-token-ksh2r kubernetes.io/service-account-token 3 28m
pv-protection-controller-token-2np6q kubernetes.io/service-account-token 3 28m
pvc-protection-controller-token-4jdwq kubernetes.io/service-account-token 3 28m
replicaset-controller-token-b2zjz kubernetes.io/service-account-token 3 28m
replication-controller-token-c8jwk kubernetes.io/service-account-token 3 28m
resourcequota-controller-token-2rm87 kubernetes.io/service-account-token 3 28m
root-ca-cert-publisher-token-lc4xc kubernetes.io/service-account-token 3 28m
service-account-controller-token-wflvt kubernetes.io/service-account-token 3 28m
service-controller-token-9555f kubernetes.io/service-account-token 3 28m
statefulset-controller-token-nhklv kubernetes.io/service-account-token 3 28m
token-cleaner-token-x42xx kubernetes.io/service-account-token 3 28m
ttl-after-finished-controller-token-nppn2 kubernetes.io/service-account-token 3 28m
ttl-controller-token-79wqf kubernetes.io/service-account-token 3 28m
[root@k8s-master01 ~]# kubectl get secret -n kube-system bootstrap-token-7t2weq -o yaml
apiVersion: v1
data:
auth-extra-groups: c3lzdGVtOmJvb3RzdHJhcHBlcnM6a3ViZWFkbTpkZWZhdWx0LW5vZGUtdG9rZW4=
expiration: MjAyMi0wMS0wMlQyMDo0MjowNlo=
token-id: N3Qyd2Vx
token-secret: YmpiYXdhdXNtMGpheHVyeQ==
usage-bootstrap-authentication: dHJ1ZQ==
usage-bootstrap-signing: dHJ1ZQ==
kind: Secret
metadata:
creationTimestamp: "2022-01-01T20:42:06Z"
name: bootstrap-token-7t2weq
namespace: kube-system
resourceVersion: "223"
uid: 55d2933f-0ee2-4a54-9f02-0c105fe97be1
type: bootstrap.kubernetes.io/token
[root@k8s-master01 ~]# echo "MjAyMi0wMS0wMlQyMDo0MjowNlo=" |base64 --decode
2022-01-02T20:42:06Z[root@k8s-master01 ~]#
[root@k8s-master01 ~]# kubectl delete secret -n kube-system bootstrap-token-7t2weq
secret "bootstrap-token-7t2weq" deleted
[root@k8s-master01 ~]# kubectl delete secret -n kube-system bootstrap-token-9yqdd5
secret "bootstrap-token-9yqdd5" deleted
[root@k8s-master01 ~]# kubectl get secret -n kube-system
NAME TYPE DATA AGE
attachdetach-controller-token-lzrnd kubernetes.io/service-account-token 3 32m
bootstrap-signer-token-hzgrs kubernetes.io/service-account-token 3 32m
calico-kube-controllers-token-xxxmn kubernetes.io/service-account-token 3 14m
calico-node-token-q264q kubernetes.io/service-account-token 3 14m
certificate-controller-token-xjcls kubernetes.io/service-account-token 3 32m
clusterrole-aggregation-controller-token-vdhnt kubernetes.io/service-account-token 3 32m
coredns-token-ndkm2 kubernetes.io/service-account-token 3 32m
cronjob-controller-token-9s4hg kubernetes.io/service-account-token 3 32m
daemon-set-controller-token-fv8rs kubernetes.io/service-account-token 3 32m
default-token-5wnhm kubernetes.io/service-account-token 3 32m
deployment-controller-token-6bl57 kubernetes.io/service-account-token 3 32m
disruption-controller-token-xvtv7 kubernetes.io/service-account-token 3 32m
endpoint-controller-token-gc8qs kubernetes.io/service-account-token 3 32m
endpointslice-controller-token-tkfm9 kubernetes.io/service-account-token 3 32m
endpointslicemirroring-controller-token-k66nr kubernetes.io/service-account-token 3 32m
ephemeral-volume-controller-token-4tzxh kubernetes.io/service-account-token 3 32m
expand-controller-token-hztsb kubernetes.io/service-account-token 3 32m
generic-garbage-collector-token-9zmrv kubernetes.io/service-account-token 3 32m
horizontal-pod-autoscaler-token-h6ct5 kubernetes.io/service-account-token 3 32m
job-controller-token-bsh9b kubernetes.io/service-account-token 3 32m
kube-proxy-token-j45xs kubernetes.io/service-account-token 3 32m
namespace-controller-token-tmt8l kubernetes.io/service-account-token 3 32m
node-controller-token-j444g kubernetes.io/service-account-token 3 32m
persistent-volume-binder-token-2v79v kubernetes.io/service-account-token 3 32m
pod-garbage-collector-token-ksh2r kubernetes.io/service-account-token 3 32m
pv-protection-controller-token-2np6q kubernetes.io/service-account-token 3 32m
pvc-protection-controller-token-4jdwq kubernetes.io/service-account-token 3 32m
replicaset-controller-token-b2zjz kubernetes.io/service-account-token 3 32m
replication-controller-token-c8jwk kubernetes.io/service-account-token 3 32m
resourcequota-controller-token-2rm87 kubernetes.io/service-account-token 3 32m
root-ca-cert-publisher-token-lc4xc kubernetes.io/service-account-token 3 32m
service-account-controller-token-wflvt kubernetes.io/service-account-token 3 32m
service-controller-token-9555f kubernetes.io/service-account-token 3 32m
statefulset-controller-token-nhklv kubernetes.io/service-account-token 3 32m
token-cleaner-token-x42xx kubernetes.io/service-account-token 3 32m
ttl-after-finished-controller-token-nppn2 kubernetes.io/service-account-token 3 32m
ttl-controller-token-79wqf kubernetes.io/service-account-token 3 32m
Token过期后生成新的token：
[root@k8s-master01 ~]# kubeadm token create --print-join-command
kubeadm join 10.0.0.200:16443 --token bq1cbw.dv5jsa9z52bwgny5 --discovery-token-ca-cert-hash sha256:6a259f0b91a7412345ee5c182db413a61b5afc93a411e7b949fbc297201594cf
# Master需要生成--certificate-key
[root@k8s-master01 ~]# kubeadm init phase upload-certs --upload-certs
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
7a6cebd73a46feaf355660104e261534786f5984ebfacdd720bbadf385c1bfb4
# 初始化其他master加入集群,--control-plane --certificate-key
[root@k8s-master02 ~]# kubeadm join 10.0.0.200:16443 --token bq1cbw.dv5jsa9z52bwgny5 --discovery-token-ca-cert-hash sha256:6a259f0b91a7412345ee5c182db413a61b5afc93a411e7b949fbc297201594cf \
--control-plane --certificate-key 7a6cebd73a46feaf355660104e261534786f5984ebfacdd720bbadf385c1bfb4
[preflight] Running pre-flight checks
[WARNING FileExisting-tc]: tc not found in system path
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[preflight] Running pre-flight checks before initializing the new control plane instance
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[download-certs] Downloading the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "apiserver" certificate and key
...
To start administering your cluster from this node, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Run 'kubectl get nodes' to see this node join the cluster.
[root@k8s-master02 ~]# mkdir -p $HOME/.kube
[root@k8s-master02 ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@k8s-master02 ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
[root@k8s-master02 ~]#
1.1.7 Node节点的配置
Node节点上主要部署公司的一些业务应用，生产环境中不建议Master节点部署系统组件之外的其他Pod，测试环境可以允许Master节点部署Pod以节省系统资源。
[root@k8s-master01 ~]# kubeadm token create --print-join-command
kubeadm join 10.0.0.200:16443 --token bq1cbw.dv5jsa9z52bwgny5 --discovery-token-ca-cert-hash sha256:6a259f0b91a7412345ee5c182db413a61b5afc93a411e7b949fbc297201594cf
[root@k8s-node02 ~]# kubeadm join 10.0.0.200:16443 --token bq1cbw.dv5jsa9z52bwgny5 --discovery-token-ca-cert-hash sha256:6a259f0b91a7412345ee5c182db413a61b5afc93a411e7b949fbc297201594cf
[preflight] Running pre-flight checks
[WARNING FileExisting-tc]: tc not found in system path
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
在主节点上看，都已经加入到集群中
[root@k8s-master01 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master01 Ready control-plane,master 12h v1.23.1
k8s-master02 Ready control-plane,master 36m v1.23.1
k8s-master03 Ready control-plane,master 28m v1.23.1
k8s-node01 Ready <none> 10m v1.23.1
k8s-node02 Ready <none> 19m v1.23.1
1.1.8 Metrics部署
在新版的Kubernetes中系统资源的采集均使用Metrics-server，可以通过Metrics采集节点和Pod的内存、磁盘、CPU和网络的使用率。Heapster
更改metrics的部署文件证书，将metrics-server-3.6.1/metrics-server-deployment.yaml的front-proxy-ca.pem改为front-proxy-ca.crt；再接着修改metrics-apiservice.yaml中的apiversion
[root@k8s-master01 ~]# cd k8s-ha-install/
[root@k8s-master01 k8s-ha-install]# ls
k8s-deployment-strategies.md metrics-server-0.3.7 metrics-server-3.6.1 README.md
[root@k8s-master01 k8s-ha-install]# cd metrics-server-3.6.1/
[root@k8s-master01 metrics-server-3.6.1]# ls
aggregated-metrics-reader.yaml auth-delegator.yaml auth-reader.yaml metrics-apiservice.yaml metrics-server-deployment.yaml metrics-server-service.yaml resource-reader.yaml
[root@k8s-master01 metrics-server-3.6.1]# vi metrics-server-deployment.yaml
[root@k8s-master01 metrics-server-3.6.1]# cat metrics-server-deployment.yaml
---
apiVersion: v1
...
- --kubelet-insecure-tls
- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
- --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt # change to front-proxy-ca.crt for kubeadm
- --requestheader-username-headers=X-Remote-User
...
[root@k8s-master01 metrics-server-3.6.1]# kubectl api-versions
admissionregistration.k8s.io/v1
apiextensions.k8s.io/v1
apiregistration.k8s.io/v1
apps/v1
authentication.k8s.io/v1
authorization.k8s.io/v1
autoscaling/v1
autoscaling/v2
autoscaling/v2beta1
autoscaling/v2beta2
batch/v1
batch/v1beta1
certificates.k8s.io/v1
coordination.k8s.io/v1
crd.projectcalico.org/v1
discovery.k8s.io/v1
discovery.k8s.io/v1beta1
events.k8s.io/v1
events.k8s.io/v1beta1
flowcontrol.apiserver.k8s.io/v1beta1
flowcontrol.apiserver.k8s.io/v1beta2
networking.k8s.io/v1
node.k8s.io/v1
node.k8s.io/v1beta1
policy/v1
policy/v1beta1
rbac.authorization.k8s.io/v1
scheduling.k8s.io/v1
storage.k8s.io/v1
storage.k8s.io/v1beta1
v1
[root@k8s-master01 metrics-server-3.6.1]# vi metrics-apiservice.yaml
[root@k8s-master01 metrics-server-3.6.1]# cat metrics-apiservice.yaml
---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
name: v1beta1.metrics.k8s.io
spec:
service:
name: metrics-server
namespace: kube-system
group: metrics.k8s.io
version: v1beta1
insecureSkipTLSVerify: true
groupPriorityMinimum: 100
versionPriority: 100
安装metrics server
[root@k8s-master01 metrics-server-3.6.1]# kubectl apply -f .
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created
serviceaccount/metrics-server created
Warning: spec.template.spec.nodeSelector[beta.kubernetes.io/os]: deprecated since v1.14; use "kubernetes.io/os" instead
deployment.apps/metrics-server created
service/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
[root@k8s-master01 metrics-server-3.6.1]#
将Master01节点的front-proxy-ca.crt复制到所有Node节点
scp /etc/kubernetes/pki/front-proxy-ca.crt k8s-node01:/etc/kubernetes/pki/front-proxy-ca.crt
scp /etc/kubernetes/pki/front-proxy-ca.crt k8s-node(其他节点自行拷贝):/etc/kubernetes/pki/front-proxy-ca.crt
1.1.9 Dashboard部署
官方GitHub：https://github.com/kubernetes/dashboard
Dashboard用于展示集群中的各类资源，同时也可以通过Dashboard实时查看Pod的日志和在容器中执行一些命令等。
可以在官方dashboard查看到最新版dashboard
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.3/aio/deploy/recommended.yaml
上传dashboard文件，用create创建
[root@k8s-master01 ~]# kubectl create -f recommended-2.0.4.yaml
namespace/kubernetes-dashboard created
serviceaccount/kubernetes-dashboard created
service/kubernetes-dashboard created
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-csrf created
secret/kubernetes-dashboard-key-holder created
configmap/kubernetes-dashboard-settings created
role.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
service/dashboard-metrics-scraper created
Warning: spec.template.metadata.annotations[seccomp.security.alpha.kubernetes.io/pod]: deprecated since v1.19, non-functional in v1.25+; use the "seccompProfile" field instead
deployment.apps/dashboard-metrics-scraper created
[root@k8s-master01 ~]# kubectl get po -n kubernetes-dashboard
NAME READY STATUS RESTARTS AGE
dashboard-metrics-scraper-79459f84f-s4qgd 1/1 Running 0 118s
kubernetes-dashboard-5fc4c598cf-zqft2 1/1 Running 0 118s
集群验证
[root@k8s-master01 ~]# kubectl top po -n kube-system
[root@k8s-master01 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 58m
[root@k8s-master01 ~]# kubectl get svc -n kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP,9153/TCP 58m
metrics-server ClusterIP 10.100.137.143 <none> 443/TCP 2m40s
[root@k8s-master01 ~]# telnet 10.96.0.1 443
Trying 10.96.0.1...
Connected to 10.96.0.1.
Escape character is '^]'.
^CConnection closed by foreign host.
[root@k8s-master01 ~]# telnet 10.96.0.10 53
Trying 10.96.0.10...
Connected to 10.96.0.10.
Escape character is '^]'.
^CConnection closed by foreign host.
[root@k8s-master01 ~]# kubectl get po --all-namespaces -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-kube-controllers-647d84984b-bpghh 1/1 Running 0 28m 172.168.85.194 k8s-node01 <none> <none>
kube-system calico-kube-controllers-647d84984b-rqhx4 0/1 Terminating 0 51m <none> k8s-node02 <none> <none>
kube-system calico-node-74s8h 1/1 Running 0 51m 10.0.0.100 k8s-master01 <none> <none>
kube-system calico-node-8bm2m 0/1 Init:0/3 0 51m 10.0.0.102 k8s-master03 <none> <none>
kube-system calico-node-lxkph 1/1 Running 0 51m 10.0.0.103 k8s-node01 <none> <none>
kube-system calico-node-rzbst 0/1 PodInitializing 0 51m 10.0.0.104 k8s-node02 <none> <none>
kube-system calico-node-wgzfm 1/1 Running 0 51m 10.0.0.101 k8s-master02 <none> <none>
kube-system coredns-65c54cc984-9jmf4 1/1 Running 0 60m 172.168.85.193 k8s-node01 <none> <none>
kube-system coredns-65c54cc984-w64kz 1/1 Running 0 28m 172.168.122.129 k8s-master02 <none> <none>
kube-system coredns-65c54cc984-xcc9t 0/1 Terminating 0 60m <none> k8s-node02 <none> <none>
kube-system etcd-k8s-master01 1/1 Running 3 (35m ago) 60m 10.0.0.100 k8s-master01 <none> <none>
kube-system etcd-k8s-master02 1/1 Running 2 (37m ago) 59m 10.0.0.101 k8s-master02 <none> <none>
kube-system etcd-k8s-master03 1/1 Running 0 58m 10.0.0.102 k8s-master03 <none> <none>
kube-system kube-apiserver-k8s-master01 1/1 Running 3 (35m ago) 60m 10.0.0.100 k8s-master01 <none> <none>
kube-system kube-apiserver-k8s-master02 1/1 Running 2 (37m ago) 59m 10.0.0.101 k8s-master02 <none> <none>
kube-system kube-apiserver-k8s-master03 1/1 Running 1 (<invalid> ago) 58m 10.0.0.102 k8s-master03 <none> <none>
kube-system kube-controller-manager-k8s-master01 1/1 Running 4 (35m ago) 60m 10.0.0.100 k8s-master01 <none> <none>
kube-system kube-controller-manager-k8s-master02 1/1 Running 3 (37m ago) 59m 10.0.0.101 k8s-master02 <none> <none>
kube-system kube-controller-manager-k8s-master03 1/1 Running 0 57m 10.0.0.102 k8s-master03 <none> <none>
kube-system kube-proxy-28lj7 1/1 Running 0 57m 10.0.0.104 k8s-node02 <none> <none>
kube-system kube-proxy-2tttp 1/1 Running 0 58m 10.0.0.102 k8s-master03 <none> <none>
kube-system kube-proxy-49cs9 1/1 Running 2 (35m ago) 60m 10.0.0.100 k8s-master01 <none> <none>
kube-system kube-proxy-j6rrq 1/1 Running 1 (37m ago) 59m 10.0.0.101 k8s-master02 <none> <none>
kube-system kube-proxy-z75kb 1/1 Running 1 (37m ago) 57m 10.0.0.103 k8s-node01 <none> <none>
kube-system kube-scheduler-k8s-master01 1/1 Running 4 (35m ago) 60m 10.0.0.100 k8s-master01 <none> <none>
kube-system kube-scheduler-k8s-master02 1/1 Running 3 (37m ago) 59m 10.0.0.101 k8s-master02 <none> <none>
kube-system kube-scheduler-k8s-master03 1/1 Running 0 57m 10.0.0.102 k8s-master03 <none> <none>
kube-system metrics-server-6bcff985dc-tsjsj 0/1 CrashLoopBackOff 5 (61s ago) 4m 172.168.85.200 k8s-node01 <none> <none>
kubernetes-dashboard dashboard-metrics-scraper-79459f84f-s4qgd 1/1 Running 0 18m 172.168.85.197 k8s-node01 <none> <none>
kubernetes-dashboard kubernetes-dashboard-5fc4c598cf-zqft2 1/1 Running 0 18m 172.168.85.196 k8s-node01 <none> <none>
# 更改dashboard的svc为NodePort,将ClusterIP更改为NodePort（如果已经为NodePort忽略此步骤）：
[root@k8s-master01 ~]# kubectl edit svc kubernetes-dashboard -n !$
...
sessionAffinity: None
type: NodePort
status:
...
kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard
service/kubernetes-dashboard edited
# 查看端口号：
[root@k8s-master01 ~]# kubectl get svc -n kubernetes-dashboard
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
dashboard-metrics-scraper ClusterIP 10.108.188.180 <none> 8000/TCP 26m
kubernetes-dashboard NodePort 10.111.83.159 <none> 443:30668/TCP 26m
根据自己的实例端口号，通过任意安装了kube-proxy的宿主机或者VIP的IP+端口即可访问到dashboard：
访问Dashboard：https://10.0.0.200:30668（请更改30668为自己的端口），选择登录方式为令牌（即token方式）
在谷歌浏览器（Chrome）启动文件中加入启动参数，用于解决无法访问Dashboard的问题，参考图1-1：
--test-type --ignore-certificate-errors
查看token值：
[root@k8s-master01 ~]# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')
Name: attachdetach-controller-token-84cg6
Namespace: kube-system
Labels: <none>
Annotations: kubernetes.io/service-account.name: attachdetach-controller
kubernetes.io/service-account.uid: 4ef3c043-eb63-4e9a-86e3-5ebc89fe83fc
Type: kubernetes.io/service-account-token
Data
====
namespace: 11 bytes
token: eyJhbGciOiJSUzI1NiIsImtpZCI6IlZoMzVDb3NCMjE0aDBpUFdLQUtDM0xibFBPeWNlTWtkWk40RkVTX29VMjAifQ.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.nyAucUTujqeNw1TP0zJQdCvdR3_Yy0LTQu2s0bGQeW0tHthewCfgIHqocxvzcfHGSUyyndSQB7U2gqHPyuVah8JRRsjcWbR6XzFXAbDh_xoZ32EN5l9sBaFUNElwfQo0GTRwL9JBS_H1uAYxhMermUPKbs1jeNusPKz-K2RHh69hqzfaZ9fmZ70C7m1aeosKWrDCoDhw19VT9XHdT8OLHBBNwhlTG4kkmbQ8MOQH96xyYHmH0up563JOB26nYj4xtDShQdoAmJkgCQ8PDu33wJ7_GU-WxgHqZQfF-LbI8DzxHYjC_zO26-LSN6YFoMDRW0SbkisUHaWJir1bOMGMAg
ca.crt: 1099 bytes
......
图1-2 Dashboard登录方式
创建管理员用户vim admin.yaml
[root@k8s-master01 ~]# vim admin.yaml
[root@k8s-master01 ~]# cat admin.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: admin-user
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: admin-user
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: admin-user
namespace: kube-system
[root@k8s-master01 ~]# kubectl create -f admin.yaml
serviceaccount/admin-user created
clusterrolebinding.rbac.authorization.k8s.io/admin-user created
[root@k8s-master01 ~]# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')
Name: admin-user-token-6nfc8
Namespace: kube-system
Labels: <none>
Annotations: kubernetes.io/service-account.name: admin-user
kubernetes.io/service-account.uid: a66053ed-fa66-4bd7-b57b-fa69672012e9
Type: kubernetes.io/service-account-token
Data
====
ca.crt: 1099 bytes
namespace: 11 bytes
token: eyJhbGciOiJSUzI1NiIsImtpZCI6IlZoMzVDb3NCMjE0aDBpUFdLQUtDM0xibFBPeWNlTWtkWk40RkVTX29VMjAifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJhZG1pbi11c2VyLXRva2VuLTZuZmM4Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQubmFtZSI6ImFkbWluLXVzZXIiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiJhNjYwNTNlZC1mYTY2LTRiZDctYjU3Yi1mYTY5NjcyMDEyZTkiLCJzdWIiOiJzeXN0ZW06c2VydmljZWFjY291bnQ6a3ViZS1zeXN0ZW06YWRtaW4tdXNlciJ9.SjR1LFcKJLkLHk4uiayQs3nsSbIrUSpCNvdL77jPnCYAIs6xgfN_D3wXY7Fpw9Zn-K-bAQHPI4zVgKOmTYRKIfOGup90j0HkrQ2epLrK6Ys7RgZ8MPEzMM0thayc7XCK9KRkSeOzJuLXo9MmsYcc6T8zn2RyAlvHm1lYtb5hgyZqH1KN02ZmU2BVf09NUbZ5BSzk7J1wF-DwJvxrKPs5wtjf4jsH9a_hSVT4B2QaYPYFccXL1I0G8l25xTg6beyd3wZCZ5WLjyzzx6-VvdF102UoO-WbbtOGX0LZx4Px4GKh6q9zjp9BPX4pjQT1_2NIsQpA58hECpiemcUHWUaq1w
[root@k8s-master01 ~]#
将token值输入到令牌后，单击登录即可访问Dashboard
1.1.10 一些必须的配置更改
将Kube-proxy改为ipvs模式，因为在初始化集群的时候注释了ipvs配置，所以需要自行修改一下：
在master01节点执行
kubectl edit cm kube-proxy -n kube-system
mode: “ipvs”
更新Kube-Proxy的Pod：
kubectl patch daemonset kube-proxy -p "{\"spec\":{\"template\":{\"metadata\":{\"annotations\":{\"date\":\"`date +'%s'`\"}}}}}" -n kube-system
验证Kube-Proxy模式
[root@k8s-master01 1.1.1]# curl 127.0.0.1:10249/proxyMode
ipvs
在所有的master节点
开启keepalived的健康检查：
[root@k8s-master01 etc]# vim /etc/keepalived
[root@k8s-master01 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 3
weight -5
fall 2
}
vrrp_instance VI_1 {
state MASTER
interface ens160
mcast_src_ip 10.0.0.100
virtual_router_id 51
priority 100
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
10.0.0.200
}
# 将此块注释打开
track_script {
chk_apiserver
}
}
重启keepalived
systemctl daemon-reload
systemctl restart keepalived
推荐
https://www.kuboard.cn/
[root@k8s-master01 ~]# kubectl apply -f https://addons.kuboard.cn/kuboard/kuboard-v3.yaml
namespace/kuboard created
configmap/kuboard-v3-config created
serviceaccount/kuboard-boostrap created
clusterrolebinding.rbac.authorization.k8s.io/kuboard-boostrap-crb created
daemonset.apps/kuboard-etcd created
deployment.apps/kuboard-v3 created
service/kuboard-v3 created
[root@k8s-master01 ~]# kubectl get pods -n kuboard
NAME READY STATUS RESTARTS AGE
kuboard-etcd-74nxg 1/1 Running 0 96s
kuboard-etcd-txvr7 1/1 Running 0 96s
kuboard-v3-56b4b954c9-dck9h 0/1 Running 0 96s
[root@k8s-master01 ~]# kubectl get svc -n !$
kubectl get svc -n kuboard
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kuboard-v3 NodePort 10.97.251.199 <none> 80:30080/TCP,10081:30081/TCP,10081:30081/UDP 114s
账号：admin
密码：Kuboard123
注意事项
注意：kubeadm安装的集群，证书有效期默认是一年。master节点的kube-apiserver、kube-scheduler、kube-controller-manager、etcd都是以容器运行的。可以通过kubectl get po -n kube-system查看。
启动和二进制不同的是，kubelet的配置文件在/etc/sysconfig/Kubelet
其他组件的配置文件在/etc/kubernetes目录下，比如kube-apiserver.yaml，该yaml文件更改后，kubelet会自动刷新配置，也就是会重启pod。不能再次创建该文件