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   -> 系统运维 -> 生产级二进制安装k8s-1.23.x版本 -> 正文阅读

[系统运维]生产级二进制安装k8s-1.23.x版本

目录

1.准备环境

图图

在这里插入图片描述

主机清单

在这里插入图片描述

网段分配

  • 物理主机：192.168.10.0/24
  • service：10.96.0.0/12
  • pod：172.16.0.0/12

生产环境需求

  • master节点数：3个及以上master节点，必须为单数
节点数：0-100	8C16G+
节点数：100-250	8C32G+
节点数：250-500	16C32G+
  • etcd节点：3个及以上实现高可用，最好使用ssd磁盘
节点数：0-50		2C8G+	50G SSD
节点数：50-250	4C16G+	150G SSD
节点数：250-1000	8C32G+	250G SSD
  • 如果有条件建议k8s集群与etcd集群分开安装

1.1.k8s基础系统环境配置

k8s基础环境配置

  • 里面可能没有1.2和1.3两项，参考下面两项

1.2.所有节点配置hosts本地解析

[root@k8s-master01 ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.10.2 k8s-master01
192.168.10.3 k8s-master02
192.168.10.4 k8s-master03
192.168.10.5 k8s-node01
192.168.10.6 k8s-node02
192.168.10.7 lb01
192.168.10.8 lb02
192.168.10.100 lb-vip

1.3.k8s-master01节点向所有节点配置免密登录

[root@k8s-master01 ~]# ssh-keygen -t rsa
[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

2.k8s基本组件安装

2.1.所有k8s节点安装Containerd作为Runtime

  • 废弃docker第一步，安装docker-20.10（安装了，不适用，哎，就是玩！！！）
yum install docker-ce-20.10.* docker-ce-cli-20.10.* containerd -y
  • 配置Containerd所需的模块
cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF

# 查看
cat /etc/modules-load.d/containerd.conf 
overlay
br_netfilter
  • 加载模块
modprobe -- overlay
modprobe -- br_netfilter
  • 配置Containerd所需的内核
cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

# 加载内核
sysctl --system
  • 创建Containerd的配置文件
mkdir -p /etc/containerd
containerd config default | tee /etc/containerd/config.toml
  • 修改Containerd的配置文件
vim /etc/containerd/config.toml

# 找到containerd.runtimes.runc.options，在其下加入SystemdCgroup = true
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
              SystemdCgroup = true
    [plugins."io.containerd.grpc.v1.cri".cni]

# 将sandbox_image默认地址改为符合版本地址
    sandbox_image = "registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.6"
  • 启动并设置为开机启动
systemctl daemon-reload
systemctl enable --now containerd
  • 配置crictl客户端连接的运行时位置
cat > /etc/crictl.yaml <<EOF
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 10
debug: false
EOF

2.2.k8s与etcd下载及安装（仅在master01操作）

  • 下载k8s安装包（你用哪个下哪个）
wget https://dl.k8s.io/v1.23.3/kubernetes-server-linux-amd64.tar.gz
  • 下载etcd安装包
wget https://github.com/etcd-io/etcd/releases/download/v3.5.1/etcd-v3.5.1-linux-amd64.tar.gz
  • 解压k8s安装文件
tar -xf kubernetes-server-linux-amd64.tar.gz  --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}
  • 解压etcd安装文件
tar -xf etcd-v3.5.1-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.1-linux-amd64/etcd{,ctl}

# 查看/usr/local/bin下内容
ls /usr/local/bin/
etcd  etcdctl  kube-apiserver  kube-controller-manager  kubectl  kubelet  kube-proxy  kube-scheduler
  • 查看版本
[root@k8s-master01 ~]# kubelet --version
Kubernetes v1.23.3
[root@k8s-master01 ~]# etcdctl version
etcdctl version: 3.5.1
API version: 3.5
  • 将组件发送至其他k8s节点
Master='k8s-master02 k8s-master03'
Work='k8s-node01 k8s-node02'
for NODE in $Master; do echo $NODE; scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/; scp /usr/local/bin/etcd* $NODE:/usr/local/bin/; done
for NODE in $Work; do     scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/ ; done
  • 克隆证书相关文件（自己创建也可以，我就用现成的了）
git clone https://github.com/dotbalo/k8s-ha-install.git
cd k8s-ha-install/ && git checkout manual-installation-v1.23.x
  • 所有k8s节点创建目录
mkdir -p /opt/cni/bin

3.相关证书生成

  • master01节点下载证书生成工具
wget "https://github.com/cloudflare/cfssl/releases/download/v1.6.1/cfssl_1.6.1_linux_amd64" -O /usr/local/bin/cfssl
wget "https://github.com/cloudflare/cfssl/releases/download/v1.6.1/cfssljson_1.6.1_linux_amd64" -O /usr/local/bin/cfssljson
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson

3.1.生成etcd证书

  • 特别说明除外，以下操作在所有master节点操作
  • 所有master节点创建证书存放目录
mkdir /etc/etcd/ssl -p
  • master01节点生成etcd证书
cd /root/k8s-ha-install/pki/

# 生成etcd证书和etcd证书的key（如果你觉得以后可能会扩容，可以在ip那多写几个预留出来）
cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca

cfssl gencert \
   -ca=/etc/etcd/ssl/etcd-ca.pem \
   -ca-key=/etc/etcd/ssl/etcd-ca-key.pem \
   -config=ca-config.json \
   -hostname=127.0.0.1,k8s-master01,k8s-master02,k8s-master03,192.168.10.2,192.168.10.3,192.168.10.4 \
   -profile=kubernetes \
   etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd
  • 将证书复制到其他节点
Master='k8s-master02 k8s-master03'
for NODE in $Master; do
     ssh $NODE "mkdir -p /etc/etcd/ssl"
     for FILE in etcd-ca-key.pem  etcd-ca.pem  etcd-key.pem  etcd.pem; do
       scp /etc/etcd/ssl/${FILE} $NODE:/etc/etcd/ssl/${FILE}
     done
 done

3.2.生成k8s相关证书

  • 特别说明除外，以下操作在所有master节点操作
  • 所有k8s节点创建证书存放目录
mkdir -p /etc/kubernetes/pki
  • master01节点生成k8s证书
# 生成一个根证书
cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca

# 10.96.0.1是service网段的第一个地址，需要计算，192.168.10.100为高可用vip地址
cfssl gencert   -ca=/etc/kubernetes/pki/ca.pem   -ca-key=/etc/kubernetes/pki/ca-key.pem   -config=ca-config.json   -hostname=10.96.0.1,192.168.10.100,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.10.2,192.168.10.3,192.168.10.4   -profile=kubernetes   apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver
  • 生成apiserver聚合证书
cfssl gencert   -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca 

# 有一个警告，可以忽略
cfssl gencert   -ca=/etc/kubernetes/pki/front-proxy-ca.pem   -ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem   -config=ca-config.json   -profile=kubernetes   front-proxy-client-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-client
  • 生成controller-manage的证书
cfssl gencert \
   -ca=/etc/kubernetes/pki/ca.pem \
   -ca-key=/etc/kubernetes/pki/ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   manager-csr.json | cfssljson -bare /etc/kubernetes/pki/controller-manager

# 设置一个集群项
kubectl config set-cluster kubernetes \
     --certificate-authority=/etc/kubernetes/pki/ca.pem \
     --embed-certs=true \
     --server=https://192.168.10.100:8443 \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

# 设置一个环境项，一个上下文
kubectl config set-context system:kube-controller-manager@kubernetes \
    --cluster=kubernetes \
    --user=system:kube-controller-manager \
    --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

# 设置一个用户项
kubectl config set-credentials system:kube-controller-manager \
     --client-certificate=/etc/kubernetes/pki/controller-manager.pem \
     --client-key=/etc/kubernetes/pki/controller-manager-key.pem \
     --embed-certs=true \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
# 设置默认环境
kubectl config use-context system:kube-controller-manager@kubernetes \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

cfssl gencert \
   -ca=/etc/kubernetes/pki/ca.pem \
   -ca-key=/etc/kubernetes/pki/ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler

kubectl config set-cluster kubernetes \
     --certificate-authority=/etc/kubernetes/pki/ca.pem \
     --embed-certs=true \
     --server=https://192.168.10.100:8443 \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

kubectl config set-credentials system:kube-scheduler \
     --client-certificate=/etc/kubernetes/pki/scheduler.pem \
     --client-key=/etc/kubernetes/pki/scheduler-key.pem \
     --embed-certs=true \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

kubectl config set-context system:kube-scheduler@kubernetes \
     --cluster=kubernetes \
     --user=system:kube-scheduler \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

kubectl config use-context system:kube-scheduler@kubernetes \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

cfssl gencert \
   -ca=/etc/kubernetes/pki/ca.pem \
   -ca-key=/etc/kubernetes/pki/ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin

kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://192.168.10.100:8443     --kubeconfig=/etc/kubernetes/admin.kubeconfig

kubectl config set-credentials kubernetes-admin     --client-certificate=/etc/kubernetes/pki/admin.pem     --client-key=/etc/kubernetes/pki/admin-key.pem     --embed-certs=true     --kubeconfig=/etc/kubernetes/admin.kubeconfig

kubectl config set-context kubernetes-admin@kubernetes     --cluster=kubernetes     --user=kubernetes-admin     --kubeconfig=/etc/kubernetes/admin.kubeconfig

kubectl config use-context kubernetes-admin@kubernetes     --kubeconfig=/etc/kubernetes/admin.kubeconfig
  • 创建ServiceAccount Key ——secret
openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub
  • 将证书发送到其他master节点
for NODE in k8s-master02 k8s-master03; do 
for FILE in $(ls /etc/kubernetes/pki | grep -v etcd); do 
scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE};
done; 
for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig; do 
scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE};
done;
done
  • 查看证书
[root@k8s-master01 pki]# ls /etc/kubernetes/pki/
admin.csr      apiserver-key.pem  ca.pem                      front-proxy-ca.csr      front-proxy-client-key.pem  scheduler.csr
admin-key.pem  apiserver.pem      controller-manager.csr      front-proxy-ca-key.pem  front-proxy-client.pem      scheduler-key.pem
admin.pem      ca.csr             controller-manager-key.pem  front-proxy-ca.pem      sa.key                      scheduler.pem
apiserver.csr  ca-key.pem         controller-manager.pem      front-proxy-client.csr  sa.pub

# 一共23个就对了
[root@k8s-master01 pki]# ls /etc/kubernetes/pki/ |wc -l
23

4.k8s系统组件配置

4.1.etcd配置

  • master01配置
cat /etc/etcd/etcd.config.yml 

name: 'k8s-master01'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.10.2:2380'
listen-client-urls: 'https://192.168.10.2:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.10.2:2380'
advertise-client-urls: 'https://192.168.10.2:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.10.2:2380,k8s-master02=https://192.168.10.3:2380,k8s-master03=https://192.168.10.4:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
  • master02配置
cat /etc/etcd/etcd.config.yml 

name: 'k8s-master02'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.10.3:2380'
listen-client-urls: 'https://192.168.10.3:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.10.3:2380'
advertise-client-urls: 'https://192.168.10.3:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.10.2:2380,k8s-master02=https://192.168.10.3:2380,k8s-master03=https://192.168.10.4:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
  • master03配置
cat /etc/etcd/etcd.config.yml
name: 'k8s-master03'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.10.4:2380'
listen-client-urls: 'https://192.168.10.4:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.10.4:2380'
advertise-client-urls: 'https://192.168.10.4:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.10.2:2380,k8s-master02=https://192.168.10.3:2380,k8s-master03=https://192.168.10.4:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false

4.2.创建service（所有master节点操作）

  • 创建etcd.service并启动
vim /usr/lib/systemd/system/etcd.service
cat /usr/lib/systemd/system/etcd.service 

[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target

[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
Alias=etcd3.service
  • 创建etcd证书目录
mkdir /etc/kubernetes/pki/etcd
ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
systemctl daemon-reload
systemctl enable --now etcd
  • 查看etcd状态
export ETCDCTL_API=3
etcdctl --endpoints="192.168.10.4:2379,192.168.10.3:2379,192.168.10.2:2379" --cacert=/etc/kubernetes/pki/etcd/etcd-ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem  endpoint status --write-out=table
+-------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|     ENDPOINT      |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+-------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 192.168.10.4:2379 | 56875ab4a12c94e8 |   3.5.1 |   25 kB |     false |      false |         2 |          8 |                  8 |        |
| 192.168.10.3:2379 | 33df6a8fe708d3fd |   3.5.1 |   25 kB |      true |      false |         2 |          8 |                  8 |        |
| 192.168.10.2:2379 | 58fbe5ec9743048f |   3.5.1 |   20 kB |     false |      false |         2 |          8 |                  8 |        |
+-------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

5.高可用配置

  • 在lb01和lb02两台服务器上操作
  • 安装keepalived和haproxy服务（想用新版可自行安装也行）
yum -y install keepalived haproxy
  • 修改haproxy配置文件（两台配置文件一样）
[root@lb01 ~]# cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.bak
[root@lb01 ~]# vim /etc/haproxy/haproxy.cfg
[root@lb01 ~]# cat /etc/haproxy/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 k8s-master
  bind 0.0.0.0:8443
  bind 127.0.0.1:8443
  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    192.168.10.2:6443  check
  server k8s-master02    192.168.10.3:6443  check
  server k8s-master03    192.168.10.4:6443  check
  • lb01配置keepalived master节点
[root@lb01 ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
[root@lb01 ~]# vim /etc/keepalived/keepalived.conf
[root@lb01 ~]# cat /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 5 
    weight -5
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    mcast_src_ip 192.168.10.7
    virtual_router_id 51
    priority 100
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.10.100
    }
    track_script {
      chk_apiserver 
} }
  • lb02配置keepalived backup节点
[root@lb02 ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
您在 /var/spool/mail/root 中有新邮件
[root@lb02 ~]# vim /etc/keepalived/keepalived.conf
[root@lb02 ~]# cat /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 5 
    weight -5
    fall 2
    rise 1
 
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    mcast_src_ip 192.168.10.8
    virtual_router_id 51
    priority 50
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.10.100
    }
    track_script {
      chk_apiserver 
} }
  • 健康检查脚本配置（两台lb主机）
vim /etc/keepalived/check_apiserver.sh
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

# 给脚本授权
chmod +x /etc/keepalived/check_apiserver.sh
  • 启动服务
systemctl daemon-reload
systemctl enable --now haproxy
systemctl enable --now keepalived
  • 测试高可用
# 能ping同
[root@k8s-node02 ~]# ping 192.168.10.100
# 能telnet访问
[root@k8s-node02 ~]# telnet 192.168.10.100 8443
# 关闭主节点，看vip是否漂移到备节点

6.k8s组件配置（区别于第4点）

  • 所有k8s节点创建以下目录
mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes

6.1.创建apiserver（所有master节点）

  • master01节点配置
vim /usr/lib/systemd/system/kube-apiserver.service
cat /usr/lib/systemd/system/kube-apiserver.service

[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --insecure-port=0  \
      --advertise-address=192.168.10.2 \
      --service-cluster-ip-range=10.96.0.0/12  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://192.168.10.2:2379,https://192.168.10.3:2379,https://192.168.10.4:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname  \
      --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota  \
      --authorization-mode=Node,RBAC  \
      --enable-bootstrap-token-auth=true  \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem  \
      --requestheader-allowed-names=aggregator  \
      --requestheader-group-headers=X-Remote-Group  \
      --requestheader-extra-headers-prefix=X-Remote-Extra-  \
      --requestheader-username-headers=X-Remote-User
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
  • master02节点配置
vim  /usr/lib/systemd/system/kube-apiserver.service
cat  /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --insecure-port=0  \
      --advertise-address=192.168.10.3 \
      --service-cluster-ip-range=10.96.0.0/12  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://192.168.10.2:2379,https://192.168.10.3:2379,https://192.168.10.4:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname  \
      --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota  \
      --authorization-mode=Node,RBAC  \
      --enable-bootstrap-token-auth=true  \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem  \
      --requestheader-allowed-names=aggregator  \
      --requestheader-group-headers=X-Remote-Group  \
      --requestheader-extra-headers-prefix=X-Remote-Extra-  \
      --requestheader-username-headers=X-Remote-User
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
  • master03节点配置
vim  /usr/lib/systemd/system/kube-apiserver.service 
cat  /usr/lib/systemd/system/kube-apiserver.service 

[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --insecure-port=0  \
      --advertise-address=192.168.10.4 \
      --service-cluster-ip-range=10.96.0.0/12  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://192.168.10.2:2379,https://192.168.10.3:2379,https://192.168.10.4:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname  \
      --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota  \
      --authorization-mode=Node,RBAC  \
      --enable-bootstrap-token-auth=true  \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem  \
      --requestheader-allowed-names=aggregator  \
      --requestheader-group-headers=X-Remote-Group  \
      --requestheader-extra-headers-prefix=X-Remote-Extra-  \
      --requestheader-username-headers=X-Remote-User
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
  • 启动apiserver（所有master节点）
systemctl daemon-reload && systemctl enable --now kube-apiserver

# 注意查看状态是否启动正常
systemctl status kube-apiserver

6.2.配置kube-controller-manager service

  • 所有master节点配置，且配置相同
  • 172.16.0.0/12为pod网段，按需求设置你自己的网段
vim /usr/lib/systemd/system/kube-controller-manager.service
cat /usr/lib/systemd/system/kube-controller-manager.service

[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
      --v=2 \
      --logtostderr=true \
      --address=127.0.0.1 \
      --root-ca-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \
      --service-account-private-key-file=/etc/kubernetes/pki/sa.key \
      --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \
      --leader-elect=true \
      --use-service-account-credentials=true \
      --node-monitor-grace-period=40s \
      --node-monitor-period=5s \
      --pod-eviction-timeout=2m0s \
      --controllers=*,bootstrapsigner,tokencleaner \
      --allocate-node-cidrs=true \
      --cluster-cidr=172.16.0.0/12 \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
      --node-cidr-mask-size=24
      
Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target
  • 启动kube-controller-manager，并查看状态
systemctl daemon-reload
systemctl enable --now kube-controller-manager
systemctl  status kube-controller-manager

6.3.配置kube-scheduler service

  • 所有master节点配置，且配置相同
vim /usr/lib/systemd/system/kube-scheduler.service
cat /usr/lib/systemd/system/kube-scheduler.service

[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-scheduler \
      --v=2 \
      --logtostderr=true \
      --address=127.0.0.1 \
      --leader-elect=true \
      --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target
  • 启动并查看服务状态
systemctl daemon-reload
systemctl enable --now kube-scheduler
systemctl status kube-scheduler

7.TLS Bootstrapping配置

  • 在master01上配置
cd /root/k8s-ha-install/bootstrap

kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://192.168.10.100:8443     --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

kubectl config set-credentials tls-bootstrap-token-user     --token=c8ad9c.2e4d610cf3e7426e --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

kubectl config set-context tls-bootstrap-token-user@kubernetes     --cluster=kubernetes     --user=tls-bootstrap-token-user     --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

kubectl config use-context tls-bootstrap-token-user@kubernetes     --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

# token的位置在bootstrap.secret.yaml，如果修改的话到这个文件修改

mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config
  • 查看集群状态，没问题的话继续后续操作
kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS    MESSAGE                         ERROR
controller-manager   Healthy   ok                              
etcd-0               Healthy   {"health":"true","reason":""}   
scheduler            Healthy   ok                              
etcd-1               Healthy   {"health":"true","reason":""}   
etcd-2               Healthy   {"health":"true","reason":""}  

kubectl create -f bootstrap.secret.yaml

8.node节点配置

8.1.在master01上将证书复制到node节点

cd /etc/kubernetes/

for NODE in k8s-master02 k8s-master03 k8s-node01 k8s-node02; do
     ssh $NODE mkdir -p /etc/kubernetes/pki
     for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig; do
       scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE}
 done
 done

8.2.kubelet配置

  • 所有k8s节点创建相关目录
mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/
  • 所有k8s节点配置kubelet service
vim  /usr/lib/systemd/system/kubelet.service
cat  /usr/lib/systemd/system/kubelet.service

[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service

[Service]
ExecStart=/usr/local/bin/kubelet

Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target
  • 所有k8s节点配置kubelet service的配置文件
vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf
cat /etc/systemd/system/kubelet.service.d/10-kubelet.conf
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig"
Environment="KUBELET_SYSTEM_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin --container-runtime=remote --runtime-request-timeout=15m --container-runtime-endpoint=unix:///run/containerd/containerd.sock --cgroup-driver=systemd"
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' "
ExecStart=
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS
  • 所有k8s节点创建kubelet的配置文件
vim /etc/kubernetes/kubelet-conf.yml

apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s
  • 启动kubelet
systemctl daemon-reload
systemctl enable --now kubelet
  • 查看集群
kubectl get node
NAME           STATUS     ROLES    AGE   VERSION
k8s-master01   NotReady   <none>   18m   v1.23.3
k8s-master02   NotReady   <none>   18m   v1.23.3
k8s-master03   NotReady   <none>   18m   v1.23.3
k8s-node01     NotReady   <none>   18m   v1.23.3
k8s-node02     NotReady   <none>   18m   v1.23.3

8.3.kube-proxy配置

  • 此配置只在master01操作
cd /root/k8s-ha-install
kubectl -n kube-system create serviceaccount kube-proxy

kubectl create clusterrolebinding system:kube-proxy         --clusterrole system:node-proxier         --serviceaccount kube-system:kube-proxy

SECRET=$(kubectl -n kube-system get sa/kube-proxy \
    --output=jsonpath='{.secrets[0].name}')

JWT_TOKEN=$(kubectl -n kube-system get secret/$SECRET \
--output=jsonpath='{.data.token}' | base64 -d)

PKI_DIR=/etc/kubernetes/pki
K8S_DIR=/etc/kubernetes

kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://192.168.10.100:8443     --kubeconfig=${K8S_DIR}/kube-proxy.kubeconfig

kubectl config set-credentials kubernetes     --token=${JWT_TOKEN}     --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig

kubectl config set-context kubernetes     --cluster=kubernetes     --user=kubernetes     --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig

kubectl config use-context kubernetes     --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
  • 将kubeconfig发送至其他节点
for NODE in k8s-master02 k8s-master03; do
     scp /etc/kubernetes/kube-proxy.kubeconfig  $NODE:/etc/kubernetes/kube-proxy.kubeconfig
 done

for NODE in k8s-node01 k8s-node02; do
     scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
 done
  • 所有k8s节点添加kube-proxy的配置和service文件
vim /usr/lib/systemd/system/kube-proxy.service
cat /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-proxy \
  --config=/etc/kubernetes/kube-proxy.yaml \
  --v=2

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target

vim /etc/kubernetes/kube-proxy.yaml
cat /etc/kubernetes/kube-proxy.yaml
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
  acceptContentTypes: ""
  burst: 10
  contentType: application/vnd.kubernetes.protobuf
  kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
  qps: 5
clusterCIDR: 172.16.0.0/12 
configSyncPeriod: 15m0s
conntrack:
  max: null
  maxPerCore: 32768
  min: 131072
  tcpCloseWaitTimeout: 1h0m0s
  tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
  masqueradeAll: false
  masqueradeBit: 14
  minSyncPeriod: 0s
  syncPeriod: 30s
ipvs:
  masqueradeAll: true
  minSyncPeriod: 5s
  scheduler: "rr"
  syncPeriod: 30s
kind: KubeProxyConfiguration
metricsBindAddress: 127.0.0.1:10249
mode: "ipvs"
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
udpIdleTimeout: 250ms
  • 启动kube-proxy
 systemctl daemon-reload
 systemctl enable --now kube-proxy

9.安装Calico

  • 以下步骤只在master01操作
  • 更改calico网段
cd /root/k8s-ha-install/calico/
sed -i "s#POD_CIDR#172.16.0.0/12#g" calico.yaml
grep "IPV4POOL_CIDR" calico.yaml  -A 1
            - name: CALICO_IPV4POOL_CIDR
              value: "172.16.0.0/12"
# 创建
kubectl apply -f calico.yaml
  • 查看容器状态
kubectl get po -n kube-system
NAME                                       READY   STATUS    RESTARTS        AGE
calico-kube-controllers-5dffd5886b-4blh6   1/1     Running   0               4m24s
calico-node-fvbdq                          1/1     Running   1 (2m51s ago)   4m23s
calico-node-g8nqd                          1/1     Running   0               4m23s
calico-node-mdps8                          1/1     Running   0               4m24s
calico-node-nf4nt                          1/1     Running   0               4m24s
calico-node-sq2ml                          1/1     Running   0               4m24s
calico-typha-8445487f56-mg6p8              1/1     Running   0               4m24s
calico-typha-8445487f56-pxbpj              1/1     Running   0               4m24s
calico-typha-8445487f56-tnssl              1/1     Running   0               4m24s

10.安装CoreDNS

  • 以下步骤只在master01操作
  • 修改文件
cd /root/k8s-ha-install/
vim CoreDNS/coredns.yaml

  clusterIP: 10.96.0.10
  • 安装
kubectl  create -f CoreDNS/coredns.yaml 
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created

11.安装Metrics Server

  • 以下步骤只在master01操作
  • 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
  • 安装metrics server
cd /root/k8s-ha-install/metrics-server
kubectl  create -f . 

serviceaccount/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
service/metrics-server created
deployment.apps/metrics-server created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created
  • 稍等片刻查看状态
kubectl  top node
NAME           CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
k8s-master01   244m         12%    1152Mi          30%       
k8s-master02   357m         17%    1228Mi          32%       
k8s-master03   230m         11%    1232Mi          32%       
k8s-node01     98m          4%     642Mi           16%       
k8s-node02     90m          4%     644Mi           16%

12.集群验证

  • 创建pod
cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: busybox
  namespace: default
spec:
  containers:
  - name: busybox
    image: busybox:1.28
    command:
      - sleep
      - "3600"
    imagePullPolicy: IfNotPresent
  restartPolicy: Always
EOF

# 查看
kubectl get po
NAME      READY   STATUS    RESTARTS   AGE
busybox   1/1     Running   0          84s
  • 用pod解析默认命名空间中的kubernetes
[root@k8s-master01 dashboard]# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   178m
[root@k8s-master01 dashboard]# kubectl exec  busybox -n default -- nslookup kubernetes
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local
  • 测试跨命名空间是否可以解析
[root@k8s-master01 dashboard]# kubectl exec  busybox -n default -- nslookup kube-dns.kube-system
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      kube-dns.kube-system
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
  • 每个节点都必须要能访问Kubernetes的kubernetes svc 443和kube-dns的service 53
telnet 10.96.0.1 443
Trying 10.96.0.1...
Connected to 10.96.0.1.
Escape character is '^]'.

 telnet 10.96.0.10 53
Trying 10.96.0.10...
Connected to 10.96.0.10.
Escape character is '^]'.
Connection closed by foreign host.

curl 10.96.0.10:53
curl: (52) Empty reply from server
  • Pod和Pod之前要能通
kubectl get po -owide
NAME      READY   STATUS    RESTARTS   AGE   IP              NODE         NOMINATED NODE   READINESS GATES
busybox   1/1     Running   0          17m   172.27.14.193   k8s-node02   <none>           <none>

 kubectl get po -n kube-system -owide
NAME                                       READY   STATUS    RESTARTS      AGE   IP               NODE           NOMINATED NODE   READINESS GATES
calico-kube-controllers-5dffd5886b-4blh6   1/1     Running   0             77m   172.25.244.193   k8s-master01   <none>           <none>
calico-node-fvbdq                          1/1     Running   1 (75m ago)   77m   192.168.10.2     k8s-master01   <none>           <none>
calico-node-g8nqd                          1/1     Running   0             77m   192.168.10.5     k8s-node01     <none>           <none>
calico-node-mdps8                          1/1     Running   0             77m   192.168.10.6     k8s-node02     <none>           <none>
calico-node-nf4nt                          1/1     Running   0             77m   192.168.10.4     k8s-master03   <none>           <none>
calico-node-sq2ml                          1/1     Running   0             77m   192.168.10.3     k8s-master02   <none>           <none>
calico-typha-8445487f56-mg6p8              1/1     Running   0             77m   192.168.10.6     k8s-node02     <none>           <none>
calico-typha-8445487f56-pxbpj              1/1     Running   0             77m   192.168.10.2     k8s-master01   <none>           <none>
calico-typha-8445487f56-tnssl              1/1     Running   0             77m   192.168.10.5     k8s-node01     <none>           <none>
coredns-5db5696c7-67h79                    1/1     Running   0             63m   172.25.92.65     k8s-master02   <none>           <none>
metrics-server-6bf7dcd649-5fhrw            1/1     Running   0             61m   172.18.195.1     k8s-master03   <none>           <none>

# 进入busybox ping其他节点上的pod
kubectl exec -ti busybox -- sh
/ # ping 192.168.10.5
PING 192.168.10.5 (192.168.10.5): 56 data bytes
64 bytes from 192.168.10.5: seq=0 ttl=63 time=0.358 ms
64 bytes from 192.168.10.5: seq=1 ttl=63 time=0.668 ms
64 bytes from 192.168.10.5: seq=2 ttl=63 time=0.637 ms
64 bytes from 192.168.10.5: seq=3 ttl=63 time=0.624 ms
64 bytes from 192.168.10.5: seq=4 ttl=63 time=0.907 ms

# 可以连通证明这个pod是可以跨命名空间和跨主机通信的
  • 创建三个副本，可以看到3个副本分布在不同的节点上（用完可以删了）
[root@k8s-master01 ~]# kubectl create deploy nginx --image=nginx --replicas=3
deployment.apps/nginx created
[root@k8s-master01 ~]# kubectl get po -owide
NAME                     READY   STATUS              RESTARTS   AGE   IP              NODE           NOMINATED NODE   READINESS GATES
busybox                  1/1     Running             0          25m   172.27.14.193   k8s-node02     <none>           <none>
nginx-85b98978db-2cxkl   0/1     ContainerCreating   0          18s   <none>          k8s-node02     <none>           <none>
nginx-85b98978db-dvmnx   0/1     ContainerCreating   0          18s   <none>          k8s-master02   <none>           <none>
nginx-85b98978db-lmwl7   0/1     ContainerCreating   0          18s   <none>          k8s-master03   <none>           <none>

# 删除nginx
[root@k8s-master01 ~]# kubectl delete deploy nginx
  • 以上验证都没有问题的话基本这个集群就可以正常使用了。（不容易啊！！！！！！）

13.安装dashboard

  • 安装dashboard
cd /root/k8s-ha-install/dashboard/
kubectl  create -f .
# 结果显示
serviceaccount/admin-user created
clusterrolebinding.rbac.authorization.k8s.io/admin-user created
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
deployment.apps/dashboard-metrics-scraper created
  • 创建管理员用户
vim admin.yaml
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
  • 执行yaml文件
kubectl apply -f admin.yaml -n kube-system
  • 更改dashboard的svc为NodePort，如果已是请忽略
kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard
  type: NodePort
  • 查看端口号
kubectl get svc kubernetes-dashboard -n kubernetes-dashboard
NAME                   TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)         AGE
kubernetes-dashboard   NodePort   10.109.245.229   <none>        443:31608/TCP   7m32s
  • 查看token
kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')

Name:         admin-user-token-b29sl
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: admin-user
              kubernetes.io/service-account.uid: 66516eff-7898-4fdc-aeb5-844cf09897e7

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1363 bytes
namespace:  11 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6InRRR3ppeFhhOWs5ZHU2VEhDMGxQT2pjMGhDSjVMSGVsRm5PWVpRdlloRlkifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJhZG1pbi11c2VyLXRva2VuLWIyOXNsIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQubmFtZSI6ImFkbWluLXVzZXIiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiI2NjUxNmVmZi03ODk4LTRmZGMtYWViNS04NDRjZjA5ODk3ZTciLCJzdWIiOiJzeXN0ZW06c2VydmljZWFjY291bnQ6a3ViZS1zeXN0ZW06YWRtaW4tdXNlciJ9.yZEczshc-dnf7DMdQHm2tBngjJD2KDOLfUEi_8i-4YIgmew6it3JPlhEMGTbFdcMSqm85JxJ2rwXMAplCgtKcJdiARKMgb1umpoIcRSoVYeZC4jzR5Z1f3cVHSNdbEoOfSMEJpdGVjI7l2naDMQxvehngEmQD8EOJe_9Ua9yeL5uoN5QpnzjQY1n7n7kHIOcJq9yNYCxtUFs_rBavAZvCDR-rvGnkxu-7E3tncf0LPxm9PEOKyHgXyf2socFLgFNp3aOX23H9vwhSwTUYot0iJRrP-ZbjfqjmPDPoKPi1s57q6iEC871xUNvbm1QdlQDLYT3XkjNSm7--NHEUr-lhA
  • 登录dashboard,注意一定要是https://
    在这里插入图片描述

在这里插入图片描述

14. 生产环境关键性配置(根据需求配置)

  • 配置kube-controller-manager有效期100年（能不能生效的先配上再说）
vim /usr/lib/systemd/system/kube-controller-manager.service

# [Service]下找个地方加上
--cluster-signing-duration=876000h0m0s \


# 重启
systemctl daemon-reload 
systemctl restart kube-controller-manager
  • 防止漏洞扫描
vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf

[Service] 
Environment="KUBELET_KUBECONFIG_ARGS=--kubeconfig=/etc/kubernetes/kubelet.kubeconfig --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig" 
Environment="KUBELET_SYSTEM_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin" 
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml  --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.6" 
Environment="KUBELET_EXTRA_ARGS=--tls-cipher-suites=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384    --image-pull-progress-deadline=30m" 
ExecStart= 
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS
  • 预留空间，按需分配
vim /etc/kubernetes/kubelet-conf.yml

rotateServerCertificates: true
allowedUnsafeSysctls:
 - "net.core*"
 - "net.ipv4.*"
kubeReserved:
  cpu: "1"
  memory: 1Gi
  ephemeral-storage: 10Gi
systemReserved:
  cpu: "1"
  memory: 1Gi
  ephemeral-storage: 10Gi
  • 数据盘要与系统盘分开；etcd使用ssd磁盘
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