[系统运维] 二进制安装kubernets 1.20

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[系统运维]二进制安装kubernets 1.20

1、基础环境准备

1.1 服务器环境

最小化安装基础系统，并关闭防火墙 selinux和swap，更新软件源、时间同步、安装常用命令，重启后验证基础配置
这里使用Ubuntu18.04部署

角色	主机名	ip
k8s-master1	k8s-master1	10.10.100.101
k8s-master2	k8s-master2	10.10.100.102
k8s-master3	k8s-master2	10.10.100.103
haproxy1	haproxy1	10.10.100.104
haproxy2	haproxy2	10.10.100.105
harbor	harbor	10.10.100.111
node1	k8s-node1	10.10.100.107
node2	k8s-node2	10.10.100.108
node3	k8s-node3	10.10.100.109
etcd1	k8s-etcd1	10.10.100.112
etcd2	k8s-etcd2	10.10.100.113
etcd3	k8s-etcd3	10.10.100.114

2、反向代理

2.1 keepalived安装配置

2.1.1 安装

#安装keepalived
root@haproxy1:~# apt-get install keepalived -y

#拷贝配置文件
root@haproxy1:~# cp /usr/share/doc/keepalived/samples/keepalived.conf.vrrp /etc/keepalived/keepalived.conf

2.1.2 配置

master

root@haproxy1:~# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     acassen
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_garp_interval 0
   vrrp_gna_interval 0
   vrrp_mcast_group4 224.0.0.18
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 80
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    unicast_src_ip 10.10.100.104
    unicast_peer {
      10.10.100.105
    }
    virtual_ipaddress {
        10.10.100.188 dev eth0 label eth0:1
    }
}

BACKUP

root@haproxy2:~# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     acassen
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_garp_interval 0
   vrrp_gna_interval 0
   vrrp_mcast_group4 224.0.0.18
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 80
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    unicast_src_ip 10.10.100.105
    unicast_peer {
      10.10.100.104
    }
    virtual_ipaddress {
        10.10.100.188 dev eth0 label eth0:1
    }
}

2.2 haproxy安装配置

2.2.1 安装

root@haproxy1:~# apt-get install software-properties-common
root@haproxy1:~# add-apt-repository ppa:vbernat/haproxy-2.0
root@haproxy1:~# apt update
root@haproxy1:~# apt-cache madison haproxy
root@haproxy1:~# apt install haproxy=2.0.28-1ppa1~bionic -y

2.2.3 配置文件

listen stats
    mode http
    bind 0.0.0.0:9999
    stats enable
    log global
    stats uri    /haproxy-status
    stats auth   haadmin:123456

listen k8s-6443
  bind 10.10.100.188:6443
  mode tcp
  balance roundrobin
  server 10.10.100.101 10.10.100.101:6443 check inter 2s fall 3 rise 5 
  server 10.10.100.102 10.10.100.102:6443 check inter 2s fall 3 rise 5 
  server 10.10.100.103 10.10.100.103:6443 check inter 2s fall 3 rise 5

2.2.4 修改内核参数

允许绑定非本机ip

echo "net.ipv4.ip_nonlocal_bind=1" >> /etc/sysctl.conf

sysctl -p

3、安装 harbor

#安装docker
curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
add-apt-repository "deb [arch=amd64] https://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
apt-get -y update
apt-get -y install docker-ce=5:20.10.10~3-0~ubuntu-bionic

#安装docker-compose
apt install python-pip -y
pip install --upgrade pip
pip install docker-compose

#安装harbor
cd /usr/local/src
wget https://storage.googleapis.com/harbor-releases/release-1.7.0/harbor-offline-installer-v1.7.6.tgz
tar xf harbor-offline-installer-v1.7.6.tgz
ln -sv /usr/local/src/harbor /usr/local/

#修改harbor配置文件
cd /usr/local/harbor
vim harbor.cfg
#修改如下配置
hostname = 10.10.100.111
ui_url_protocol = http
harbor_admin_password = 123456

#执行安装脚本
./install.sh

4、二进制部署k8s

4.1 系统初始化

#关闭swap
swapoff -a  # 临时关闭
sed -ri 's/.*swap.*/#&/' /etc/fstab    # 永久关闭

#根据规划设置主机名
hostnamectl set-hostname <hostname> #设置对应的主机名

# 各节点添加hosts
cat >> /etc/hosts <<EOF
10.10.100.101 k8s-master1
10.10.100.102 k8s-master2
10.10.100.103 k8s-master3
10.10.100.107 k8s-node1
10.10.100.108 k8s-node2
10.10.100.109 k8s-node3
EOF

#修改内核参数
cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 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
net.bridge.bridge-nf-call-ip6tables = 1 
net.bridge.bridge-nf-call-iptables = 1 
EOF

sysctl --system  # 生效

#安装ipvsadm
apt install ipvsadm ipset -y


cat >> /etc/modules-load.d/ipvs.conf <<EOF
ip_vs
ip_vs_rr
ip_vs_wrr
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF

systemctl restart systemd-modules-load.service

cat >> /etc/security/limits.conf <<EOF
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* seft memlock unlimited
* hard memlock unlimitedd
EOF

#时间同步
apt install ntpdate -y
ntpdate time1.aliyun.com

5、部署etcd集群

5.1 准备cfssl 证书生成工具

找任意一台服务器操作即可

#下载cfssl工具
mkdir /opt/cfssl -p && cd /opt/cfssl
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64

cp cfssl_linux-amd64 /usr/local/bin/cfssl
cp cfssljson_linux-amd64 /usr/local/bin/cfssljson
cp cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

5.2 生成Etcd证书

5.2.1 自签CA证书

#创建工作目录
mkdir -p ~/TLS/{etcd,k8s}
cd ~/TLS/etcd/

#自签CA证书
#证书生成模板
cat > ca-config.json << EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "www": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}

#csr请求模板
cat > ca-csr.json << EOF
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "GuangDong",
            "ST": "ShenZhen"
        }
    ]
}
EOF

#生成证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

5.2.2 签发ETCD证书

#创建证书申请文件，hosts 填写etcd所有节点ip
cat > server-csr.json << EOF
{
    "CN": "etcd",
    "hosts": [
    "10.10.100.112",
    "10.10.100.113",
    "10.10.100.114"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "GuangDong",
            "ST": "ShenZhen"
        }
    ]
}
EOF

#签发证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

5.3 下载安装etcd集群

5.3.1 下载etcd二进制文件

cd /opt
wget https://github.com/etcd-io/etcd/releases/download/v3.4.9/etcd-v3.4.9-linux-amd64.tar.gz

5.3.2 配置文件准备

#解压
tar xf etcd-v3.4.9-linux-amd64.tar.gz

#拷贝二进制文件
mkdir /opt/etcd/{bin,cfg,ssl} -p
cp etcd-v3.4.9-linux-amd64/{etcd,etcdctl} /opt/etcd/bin

#创建etcd配置文件
cat > /opt/etcd/cfg/etcd.conf << EOF
#[Member]
ETCD_NAME="etcd-1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd" 
ETCD_LISTEN_PEER_URLS="https://10.10.100.112:2380" 
ETCD_LISTEN_CLIENT_URLS="https://10.10.100.112:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.10.100.112:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://10.10.100.112:2379" 
ETCD_INITIAL_CLUSTER="etcd-1=https://10.10.100.112:2380,etcd-2=https://10.10.100.113:2380,etcd-3=https://10.10.100.114:2380" 
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" 
ETCD_INITIAL_CLUSTER_STATE="new" 
EOF

?ETCD_NAME：节点名称，集群中唯一
?ETCD_DATA_DIR：数据目录
?ETCD_LISTEN_PEER_URLS：集群通信监听地址
?ETCD_LISTEN_CLIENT_URLS：客户端访问监听地址

?ETCD_INITIAL_ADVERTISE_PEERURLS：集群通告地址
?ETCD_ADVERTISE_CLIENT_URLS：客户端通告地址
?ETCD_INITIAL_CLUSTER：集群节点地址
?ETCD_INITIALCLUSTER_TOKEN：集群Token
?ETCD_INITIALCLUSTER_STATE：加入集群的当前状态，new是新集群，existing表示加入已有集群
#配置文件中不可以有注释，不然会启动报错。

#创建systemd启动文件
cat > /lib/systemd/system//etcd.service << EOF
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd.conf
ExecStart=/opt/etcd/bin/etcd --cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem --peer-cert-file=/opt/etcd/ssl/server.pem --peer-key-file=/opt/etcd/ssl/server-key.pem --trusted-ca-file=/opt/etcd/ssl/ca.pem --peer-trusted-ca-file=/opt/etcd/ssl/ca.pem --logger=zap
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

5.3.3 拷贝刚生成的证书文件

#将刚刚生成的证书拷贝到etcd节点
scp ./*pem 10.10.100.112/opt/etcd/ssl/

5.3.4 将节点1的所有etcd文件拷贝到其他节点

scp -r /opt/etcd 10.10.100.113:/opt/
scp -r /lib/systemd/system/etcd.service  10.10.100.114:/lib/systemd/system/

scp -r /opt/etcd 10.10.100.114:/opt/
scp -r /lib/systemd/system/etcd.service  10.10.100.113:/lib/systemd/system/

5.3.5 修改node2,node3节点etcd.conf配置文件

vim /opt/etcd/cfg/etcd.conf 
#[Member]
ETCD_NAME="etcd-2"  # 修改此处，节点2改为etcd-2，节点3改为etcd-3
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://10.10.100.113:2380" # 修改此处为当前服务器IP
ETCD_LISTEN_CLIENT_URLS="https://10.10.100.113:2379" # 修改此处为当前服务器IP

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.10.100.113:2380" # 修改此处为当前服务器IP
ETCD_ADVERTISE_CLIENT_URLS="https://10.10.100.113:2379" # 修改此处为当前服务器IP
ETCD_INITIAL_CLUSTER="etcd-1=https://10.10.100.112:2380,etcd-2=https://10.10.100.113:2380,etcd-3=https://10.10.100.114:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

5.3.6 启动并验证etcd集群信息

#启动
systemctl daemon-reload
systemctl start etcd && systemctl enable etcd

#验证etcd集群信息，输出下面信息，说明部署成功
ETCDCTL_API=3 /opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://10.10.100.112:2379,https://10.10.100.113:2379,https://10.10.100.114:2379" endpoint health --write-out=table
+----------------------------+--------+-------------+-------+
|          ENDPOINT          | HEALTH |    TOOK     | ERROR |
+----------------------------+--------+-------------+-------+
| https://10.10.100.112:2379 |   true |  6.255737ms |       |
| https://10.10.100.113:2379 |   true |  9.044208ms |       |
| https://10.10.100.114:2379 |   true | 11.886294ms |       |
+----------------------------+--------+-------------+-------+

6、 Master 部署

6.1 安装docker

master及node节点都安装docker

curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
add-apt-repository "deb [arch=amd64] https://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
apt-get -y update
#安装20.10.15版本docker
apt-get -y install docker-ce=5:20.10.15~3-0~ubuntu-bionic docker-ce-cli=5:20.10.15~3-0~ubuntu-bionic

#启动docker
root@docker-node1:~# systemctl start docker
root@docker-node1:~# systemctl enable docker

6.2 kube-apiserver 部署

6.2.1 生成kube-apiserver 证书

6.2.1.1 自签CA证书

cd ~/TLS/k8s/
cat > ca-config.json << EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

cat > ca-csr.json << EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "GuangDong",
            "ST": "ShenZhen",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

#生成CA证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

6.2.1.2 签发kube-apiserver HTTPS证书

上述文件hosts字段中IP为所有Master/LB/VIP IP，一个都不能少！为了方便后期扩容可以多写几个预留的IP。

cat > server-csr.json << EOF
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "10.10.100.101",
      "10.10.100.102",
      "10.10.100.103",
      "10.10.100.188",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "GuangDong",
            "ST": "ShenZhen",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

#生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

6.2.2 下载k8s二进制文件

下载地址：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.20.md

只需要下载server包就够了，包含了Master和Worker Node二进制文件

#下载v1.20.13版本
wget https://dl.k8s.io/v1.20.13/kubernetes-server-linux-amd64.tar.gz

##解压
tar xf kubernetes-server-linux-amd64.tar.gz

#拷贝二进制文件
mkdir -p /opt/kubernetes/{bin,cfg,ssl,logs}
cd kubernetes/server/bin/
cp kube-apiserver kube-scheduler kube-controller-manager /opt/kubernetes/bin/
cp kubectl /usr/bin/

6.2.3 部署kube-apiserver

6.2.3.1 创建kube-apiserver配置文件

3个master节点都配置，注意–bind-address --advertise-address两个参数需配置成对应节点的ip

cat > /opt/kubernetes/cfg/kube-apiserver.conf << EOF
KUBE_APISERVER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--etcd-servers=https://10.10.100.112:2379,https://10.10.100.113:2379,https://10.10.100.114:2379 \\
--bind-address=10.10.100.101 \\
--secure-port=6443 \\
--advertise-address=10.10.100.101 \\
--allow-privileged=true \\
--service-cluster-ip-range=10.0.0.0/24 \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \\
--authorization-mode=RBAC,Node \\
--enable-bootstrap-token-auth=true \\
--token-auth-file=/opt/kubernetes/cfg/token.csv \\
--service-node-port-range=30000-40000 \\
--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem \\
--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem \\
--tls-cert-file=/opt/kubernetes/ssl/server.pem  \\
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \\
--client-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--service-account-issuer=api \\
--service-account-signing-key-file=/opt/kubernetes/ssl/server-key.pem \\
--etcd-cafile=/opt/etcd/ssl/ca.pem \\
--etcd-certfile=/opt/etcd/ssl/server.pem \\
--etcd-keyfile=/opt/etcd/ssl/server-key.pem \\
--requestheader-client-ca-file=/opt/kubernetes/ssl/ca.pem \\
--proxy-client-cert-file=/opt/kubernetes/ssl/server.pem \\
--proxy-client-key-file=/opt/kubernetes/ssl/server-key.pem \\
--requestheader-allowed-names=kubernetes \\
--requestheader-extra-headers-prefix=X-Remote-Extra- \\
--requestheader-group-headers=X-Remote-Group \\
--requestheader-username-headers=X-Remote-User \\
--enable-aggregator-routing=true \\
--audit-log-maxage=30 \\
--audit-log-maxbackup=3 \\
--audit-log-maxsize=100 \\
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"
EOF

#参数详解
–logtostderr：启用日志
—v：日志等级
–log-dir：日志目录
–etcd-servers：etcd集群地址
–bind-address：监听地址
–secure-port：https安全端口
–advertise-address：集群通告地址
–allow-privileged：启用授权
–service-cluster-ip-range：Service虚拟IP地址段
–enable-admission-plugins：准入控制模块
–authorization-mode：认证授权，启用RBAC授权和节点自管理
–enable-bootstrap-token-auth：启用TLS bootstrap机制
–token-auth-file：bootstrap token文件
–service-node-port-range：Service nodeport类型默认分配端口范围
–kubelet-client-xxx：apiserver访问kubelet客户端证书
–tls-xxx-file：apiserver https证书
–service-account-issuer，–service-account-signing-key-file
–etcd-xxxfile：连接Etcd集群证书
–audit-log-xxx：审计日志
启动聚合层相关配置：–requestheader-client-ca-file，–proxy-client-cert-file，–proxy-client-key-file，–requestheader-allowed-names，–requestheader-extra-headers-prefix，–requestheader-group-headers，–requestheader-username-headers，–enable-aggregator-routing

6.2.3.2 拷贝证书

#拷贝etcd证书
mkdir /opt/etcd/ssl/
scp -r ~/TLS/etcd/*pem 10.10.100.101:/opt/etcd/ssl/
#拷贝k8s证书
scp ~/TLS/k8s/*.pem 10.10.100.101:/opt/kubernetes/ssl/

6.2.3.2 启用TLS Bootstrapping 机制

 cat > /opt/kubernetes/cfg/token.csv << EOF
9deea7a5a8b7fa15c500a4dac68209c8,kubelet-bootstrap,10001,"system:node-bootstrapper"
EOF


格式：token，用户名，UID，用户组

token也可自行生成替换：
head -c 16 /dev/urandom | od -An -t x | tr -d ' '

6.2.3.2 配置启动文件

cat > /lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver.conf
ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

#启动
systemctl daemon-reload
systemctl start kube-apiserver  && systemctl enable kube-apiserver

6.3 部署kube-controller-manager

6.3.1 创建配置文件

所有master节点配置都一样

cat > /opt/kubernetes/cfg/kube-controller-manager.conf << EOF
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--leader-elect=true \\
--kubeconfig=/opt/kubernetes/cfg/kube-controller-manager.kubeconfig \\
--bind-address=127.0.0.1 \\
--allocate-node-cidrs=true \\
--cluster-cidr=10.244.0.0/16 \\
--service-cluster-ip-range=10.0.0.0/24 \\
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \\
--root-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--cluster-signing-duration=87600h0m0s"
EOF

–kubeconfig：连接apiserver配置文件
–leader-elect：当该组件启动多个时，自动选举（HA）
–cluster-signing-cert-file/–cluster-signing-key-file：自动为kubelet颁发证书的CA，与apiserver保持一致

6.3.2 生成kube-controller-manager证书

cd ~/TLS/k8s
{
  "CN": "system:kube-controller-manager",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
       "L": "GuangDong",
       "ST": "ShenZhen",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager

6.3.3 生成kubeconfig文件

#拷贝证书,将证书拷贝到所有master节点
scp kube-controller-manager*.pem 10.10.100.101:/opt/kubernetes/ssl/
scp kube-controller-manager*.pem 10.10.100.102:/opt/kubernetes/ssl/
scp kube-controller-manager*.pem 10.10.100.103:/opt/kubernetes/ssl/

#在所有master节点操作
#需要在/opt/kubernetes/ssl/目录下执行命令或脚本
#KUBE_APISERVER可以配置成集群vip，也可以配置对应master的ip
cd /opt/kubernetes/ssl/
KUBE_CONFIG="/opt/kubernetes/cfg/kube-controller-manager.kubeconfig"
KUBE_APISERVER="https://10.10.100.188:6443"

kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials kube-controller-manager \
  --client-certificate=./kube-controller-manager.pem \
  --client-key=./kube-controller-manager-key.pem \
  --embed-certs=true \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-controller-manager \
  --kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}

6.3.4 配置启动文件

cat > /lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-controller-manager.conf
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

#启动
systemctl daemon-reload
systemctl start kube-controller-manager  && systemctl enable kube-controller-manager

6.4 部署kube-scheduler

6.4.1 生成kube-scheduler证书

cd ~/TLS/k8s/
cat > kube-scheduler-csr.json << EOF
{
  "CN": "system:kube-scheduler",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "GuangDong",
      "ST": "ShenZhen",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

#生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler

#拷贝证书到各master节点
scp /root/TLS/k8s/kube-scheduler*.pem 10.10.100.101:/opt/kubernetes/ssl/
scp /root/TLS/k8s/kube-scheduler*.pem 10.10.100.102:/opt/kubernetes/ssl/
scp /root/TLS/k8s/kube-scheduler*.pem 10.10.100.103:/opt/kubernetes/ssl/

6.4.2 创建配置文件

cat > /opt/kubernetes/cfg/kube-scheduler.conf << EOF
KUBE_SCHEDULER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--leader-elect=true \\
--kubeconfig=/opt/kubernetes/cfg/kube-scheduler.kubeconfig \\
--bind-address=127.0.0.1"
EOF

--kubeconfig：连接apiserver配置文件
--leader-elect：当该组件启动多个时，自动选举（HA）

6.4.3 生成kubeconfig文件

#cd到证书目录下执行
cd /opt/kubernetes/ssl

KUBE_CONFIG="/opt/kubernetes/cfg/kube-scheduler.kubeconfig"
KUBE_APISERVER="https://10.10.100.188:6443"

kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials kube-scheduler \
  --client-certificate=./kube-scheduler.pem \
  --client-key=./kube-scheduler-key.pem \
  --embed-certs=true \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-scheduler \
  --kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}

6.4.4 配置启动文件

cat > /lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

#启动
systemctl daemon-reload
systemctl start kube-scheduler && systemctl enable kube-scheduler

6.5 查看集群状态

6.5.1 生成kubectl连接集群的证书

 cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "GuangDong",
      "ST": "ShenZhen",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

#生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

#拷贝证书
scp /root/TLS/k8s/admin*.pem 10.10.100.101:/opt/kubernetes/ssl/
scp /root/TLS/k8s/admin*.pem 10.10.100.102:/opt/kubernetes/ssl/
scp /root/TLS/k8s/admin*.pem 10.10.100.103:/opt/kubernetes/ssl/

6.5.2 生成kubeconfig文件

mkdir /root/.kube
cd /opt/kubernetes/ssl/
KUBE_CONFIG="/root/.kube/config"
KUBE_APISERVER="https://10.10.100.188:6443"

kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials cluster-admin \
  --client-certificate=./admin.pem \
  --client-key=./admin-key.pem \
  --embed-certs=true \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
  --cluster=kubernetes \
  --user=cluster-admin \
  --kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}

6.5.3 验证查看

kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
etcd-0               Healthy   {"health":"true"}   
etcd-2               Healthy   {"health":"true"}   
etcd-1               Healthy   {"health":"true"}

6.5.4 授权kubelet-bootstrap用户允许请求证书

kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap

7、Worker Node部署

如下操作还是在master操作

7.1 部署kubelet

7.1.1 创建配置文件

cat > /opt/kubernetes/cfg/kubelet.conf << EOF
KUBELET_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--hostname-override=k8s-master1 \\
--network-plugin=cni \\
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\
--config=/opt/kubernetes/cfg/kubelet-config.yml \\
--cert-dir=/opt/kubernetes/ssl \\
--pod-infra-container-image=lizhenliang/pause-amd64:3.0"
EOF

?--hostname-override：显示名称，集群中唯一
?--network-plugin：启用CNI
?--kubeconfig：空路径，会自动生成，后面用于连接apiserver
?--bootstrap-kubeconfig：首次启动向apiserver申请证书
?--config：配置参数文件
?--cert-dir：kubelet证书生成目录
?--pod-infra-container-image：管理Pod网络容器的镜像

7.1.2 创建参数文件

cat > /opt/kubernetes/cfg/kubelet-config.yml << EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local 
failSwapOn: false
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /opt/kubernetes/ssl/ca.pem 
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
maxOpenFiles: 1000000
maxPods: 110
EOF

7.1.3 生成kubectl初次加入集群引导kubeconfig文件

KUBE_CONFIG="/opt/kubernetes/cfg/bootstrap.kubeconfig"
KUBE_APISERVER="https://10.10.100.188:6443" 
TOKEN="9deea7a5a8b7fa15c500a4dac68209c8"
 
kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials "kubelet-bootstrap" \
  --token=${TOKEN} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
  --cluster=kubernetes \
  --user="kubelet-bootstrap" \
  --kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}

7.1.4 创建启动文件

cat > /lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
After=docker.service

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet.conf
ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

#启动
systemctl daemon-reload
systemctl start kubelet  && systemctl enable kubelet

7.1.5 批准kubelet证书申请并加入集群

root@k8s-master1:~# kubectl get csr
NAME                                                   AGE   SIGNERNAME                                    REQUESTOR           REQUESTEDDURATION   CONDITION
node-csr-bKoDAsJAuVMRzElq3WcabiL2yRTmMEk6QmQ-VR2VYc0   10s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   <none>              Pending

kubectl certificate approve node-csr-bKoDAsJAuVMRzElq3WcabiL2yRTmMEk6QmQ-VR2VYc0

7.1.6 查看节点信息

root@k8s-master1:~# kubectl get node
NAME          STATUS     ROLES    AGE     VERSION
k8s-master1   NotReady   <none>   21m     v1.20.13
k8s-master2   NotReady   <none>   9m8s    v1.20.13
k8s-master3   NotReady   <none>   8m49s   v1.20.13

7.2 部署kube-proxy

7.2.1 创建配置文件

cat > /opt/kubernetes/cfg/kube-proxy.conf << EOF
KUBE_PROXY_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--config=/opt/kubernetes/cfg/kube-proxy-config.yml"
EOF

7.2.2 创建参数文件

cat > /opt/kubernetes/cfg/kube-proxy-config.yml << EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
metricsBindAddress: 0.0.0.0:10249
clientConnection:
  kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig
hostnameOverride: k8s-master1
clusterCIDR: 10.244.0.0/16
EOF

#
hostnameOverride 修改为对应主机名

7.2.3 生成证书

cd ~/TLS/k8s
cat > kube-proxy-csr.json << EOF
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "GuangDong",
      "ST": "ShenZhen",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

#生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

#拷贝证书文件
scp kube-proxy*.pem 10.10.100.101:/opt/kubernetes/ssl/
scp kube-proxy*.pem 10.10.100.102:/opt/kubernetes/ssl/
scp kube-proxy*.pem 10.10.100.103:/opt/kubernetes/ssl/

7.2.4 生成kube-proxy.kubeconfig文件

cd /opt/kubernetes/ssl/

KUBE_CONFIG="/opt/kubernetes/cfg/kube-proxy.kubeconfig"
KUBE_APISERVER="https://10.10.100.188:6443"

kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials kube-proxy \
  --client-certificate=./kube-proxy.pem \
  --client-key=./kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}

7.2.5 创建启动文件

cat > /lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-proxy.conf
ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

#启动
systemctl daemon-reload
systemctl start kube-proxy  && systemctl enable kube-proxy

7.3 部署calico网络组件

以下步骤只在master01操作
Calico是一个纯三层的数据中心网络方案，是目前Kubernetes主流的网络方案。

#下载yaml文件
 wget https://docs.projectcalico.org/manifests/calico.yaml
#启用
 kubectl apply -f calico.yaml
kubectl get pods -A
NAMESPACE     NAME                                       READY   STATUS    RESTARTS   AGE
kube-system   calico-kube-controllers-7c968d79b6-4wvxs   1/1     Running   0          7m58s
kube-system   calico-node-55ndv                          1/1     Running   0          7m58s
kube-system   calico-node-mmcmk                          1/1     Running   0          7m58s
kube-system   calico-node-rm7lc                          1/1     Running   3          7m58s
root@k8s-master1:~# kubectl get node
NAME          STATUS   ROLES    AGE   VERSION
k8s-master1   Ready    <none>   45m   v1.20.13
k8s-master2   Ready    <none>   33m   v1.20.13
k8s-master3   Ready    <none>   33m   v1.20.13

7.4 或者部署Flanne网络组件

7.4.1 部署CNI网络

CNI二进制包下载地址：
https://github.com/containernetworking/plugins/releases

v1.0.1下载链接：
https://github.com/containernetworking/plugins/releases/download/v1.0.1/cni-plugins-linux-amd64-v1.0.1.tgz

7.4.2 解压并安装CNI

#下载CNI二进制安装包
cd /opt/k8s/package
wget https://github.com/containernetworking/plugins/releases/download/v1.0.1/cni-plugins-linux-amd64-v1.0.1.tgz

#创建配置目录
mkdir /opt/cni/bin /etc/cni/net.d -p
tar xf cni-plugins-linux-amd64-v1.0.1.tgz -C /opt/cni/bin

#将CNI配置上传到每个Node
scp -r /opt/cni/ 10.10.100.102:/opt/
scp -r /opt/cni/ 10.10.100.103:/opt/
scp -r /opt/cni/ 10.10.100.107:/opt/
scp -r /opt/cni/ 10.10.100.108/opt/
scp -r /opt/cni/ 10.10.100.108:/opt/
scp -r /opt/cni/ 10.10.100.109:/opt/

#确保kubelet启用CNI
cat /opt/kubernetes/cfg/kubelet.conf 
--network-plugin=cni

7.4.3 安装flannel网络插件

wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

kubectl apply -f kube-flannel.yml

7.5 授权apiserver访问kubelet

应用场景：例如kubectl logs

cat > apiserver-to-kubelet-rbac.yaml << EOF
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:kube-apiserver-to-kubelet
rules:
  - apiGroups:
      - ""
    resources:
      - nodes/proxy
      - nodes/stats
      - nodes/log
      - nodes/spec
      - nodes/metrics
      - pods/log
    verbs:
      - "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: system:kube-apiserver
  namespace: ""
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:kube-apiserver-to-kubelet
subjects:
  - apiGroup: rbac.authorization.k8s.io
    kind: User
    name: kubernetes
EOF

kubectl apply -f apiserver-to-kubelet-rbac.yaml

7.6 添加其他node节点

7.6.1 创建工作目录并拷贝二进制文件及配置文件

从master节点拷贝到所有node节点


#拷贝二进制包
cd ~/kubernetes/server/bin/ 
scp kubelet kube-proxy root@10.10.100.107:/opt/kubernetes/bin 
scp kubelet kube-proxy root@10.10.100.108:/opt/kubernetes/bin 
scp kubelet kube-proxy root@10.10.100.109:/opt/kubernetes/bin 

#拷贝k8s所有配置
scp -r /opt/kubernetes root@10.10.100.107:/opt/
scp -r /opt/kubernetes root@10.10.100.108:/opt/
scp -r /opt/kubernetes root@10.10.100.109:/opt/

#拷贝启动文件
scp -r /lib/systemd/system/{kubelet,kube-proxy}.service root@10.10.100.107:/lib/systemd/system
scp -r /lib/systemd/system/{kubelet,kube-proxy}.service root@10.10.100.108:/lib/systemd/system
scp -r /lib/systemd/system/{kubelet,kube-proxy}.service root@10.10.100.109:/lib/systemd/system

7.6.2 删除对应文件

在刚拷贝的node节点操作

rm -f /opt/kubernetes/cfg/kubelet.kubeconfig 
rm -f /opt/kubernetes/ssl/kubelet*

#注：这几个文件是证书申请审批后自动生成的，每个Node不同，必须删除

7.6.3 生成kubectl连接集群的证书

需要安装cfssl，安装参考5.1
在node1节点操作

cd /opt/kubernetes/ssl
cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF
cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "GuangDong",
      "ST": "ShenZhen",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

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

#拷贝证书到其他节点
scp /opt/kubernetes/ssl/admin*.pem 10.10.100.108:/opt/kubernetes/ssl/
scp /opt/kubernetes/ssl/admin*.pem 10.10.100.109:/opt/kubernetes/ssl/

7.6.4 生成kubeconfig文件

mkdir /root/.kube

KUBE_CONFIG="/root/.kube/config"
KUBE_APISERVER="https://10.10.100.188:6443"

kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-credentials cluster-admin \
  --client-certificate=./admin.pem \
  --client-key=./admin-key.pem \
  --embed-certs=true \
  --kubeconfig=${KUBE_CONFIG}
kubectl config set-context default \
  --cluster=kubernetes \
  --user=cluster-admin \
  --kubeconfig=${KUBE_CONFIG}
kubectl config use-context default --kubeconfig=${KUBE_CONFIG}

#查看集群状态
kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok                  
scheduler            Healthy   ok                  
etcd-0               Healthy   {"health":"true"}   
etcd-2               Healthy   {"health":"true"}   
etcd-1               Healthy   {"health":"true"}

7.6.5 修改配置文件主机名

vim /opt/kubernetes/cfg/kubelet.conf
--hostname-override=k8s-node1

vim /opt/kubernetes/cfg/kube-proxy-config.yml
hostnameOverride: k8s-node1

#修改成对应node节点的主机名

7.6.6 启动kubelet kube-proxy

systemctl daemon-reload
systemctl start kubelet kube-proxy  && systemctl enable kubelet kube-proxy

7.6.7 在Master上批准新Node kubelet证书申请

#查看请求
kubectl get csr
NAME                                                   AGE   SIGNERNAME                                    REQUESTOR           CONDITION
node-csr-LxU_i-sMmkHdLTBp85yTRHGhvrdAmWhQeXXn-flh7aU   73m   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending
node-csr-Tr4RBOFVI_OsLzpyzFVVVNFjKfUoTGzTWBBqIYWiBY8   26s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending
node-csr-aQ1l1Uz99tJXcg_Fu-by290QCuNg5MNGwnz9dO0SnpE   38m   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending

#批准请求
kubectl certificate approve node-csr-Tr4RBOFVI_OsLzpyzFVVVNFjKfUoTGzTWBBqIYWiBY8 
kubectl certificate approve node-csr-LxU_i-sMmkHdLTBp85yTRHGhvrdAmWhQeXXn-flh7aU
kubectl certificate approve node-csr-aQ1l1Uz99tJXcg_Fu-by290QCuNg5MNGwnz9dO0SnpE

7.7 查看节点状态

root@k8s-master1:~# kubectl get nodes
NAME          STATUS   ROLES    AGE     VERSION
k8s-master1   Ready    <none>   2d15h   v1.20.13
k8s-master2   Ready    <none>   2d15h   v1.20.13
k8s-master3   Ready    <none>   2d15h   v1.20.13
k8s-node1     Ready    <none>   12m     v1.20.13
k8s-node2     Ready    <none>   8m50s   v1.20.13
k8s-node3     Ready    <none>   77s     v1.20.13

8、部署Dashboard

8.1 下载部署

#下载
cd /opt/kubernetes/dashboard
wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.4.0/aio/deploy/recommended.yaml

#启动
mv recommended.yaml  dashboard.yaml
kubectl apply -f dashboard.yaml

#将ClusterIP修改为NodePort
kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard
type: ClusterIP #修改为NodePort

kubectl edit svc dashboard-metrics-scraper -n kubernetes-dashboard
type: ClusterIP #修改为NodePort

#创建cluster-admin管理员集群角色：
cat > dashboard-adminuser.yaml <<EOF
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kubernetes-dashboard
EOF

#启动
kubectl apply -f dashboard-adminuser.yaml


# 获取用户Token
kubectl -n kubernetes-dashboard describe secret $(kubectl -n kubernetes-dashboard get secret | grep admin-user | awk '{print $1}')

8.2 访问

访问地址：https://NodeIP:30001

在这里插入图片描述

9、部署CoreDNS

9.1 coredns.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: coredns
  namespace: kube-system
  labels:
      kubernetes.io/cluster-service: "true"
      addonmanager.kubernetes.io/mode: Reconcile
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
    addonmanager.kubernetes.io/mode: Reconcile
  name: system:coredns
rules:
- apiGroups:
  - ""
  resources:
  - endpoints
  - services
  - pods
  - namespaces
  verbs:
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
    addonmanager.kubernetes.io/mode: EnsureExists
  name: system:coredns
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:coredns
subjects:
- kind: ServiceAccount
  name: coredns
  namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns
  namespace: kube-system
  labels:
      addonmanager.kubernetes.io/mode: EnsureExists
data:
  Corefile: |
    .:53 {
        errors
        health
        kubernetes cluster.local in-addr.arpa ip6.arpa {
            pods insecure
            upstream
            fallthrough in-addr.arpa ip6.arpa
        }
        prometheus :9153
        proxy . /etc/resolv.conf
        cache 30
        loop
        reload
        loadbalance
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "CoreDNS"
spec:
  # replicas: not specified here:
  # 1. In order to make Addon Manager do not reconcile this replicas parameter.
  # 2. Default is 1.
  # 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
  selector:
    matchLabels:
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        k8s-app: kube-dns
      annotations:
        seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
    spec:
      serviceAccountName: coredns
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
        - key: "CriticalAddonsOnly"
          operator: "Exists"
      containers:
      - name: coredns
        image: lizhenliang/coredns:1.2.2
        imagePullPolicy: IfNotPresent
        resources:
          limits:
            memory: 170Mi
          requests:
            cpu: 100m
            memory: 70Mi
        args: [ "-conf", "/etc/coredns/Corefile" ]
        volumeMounts:
        - name: config-volume
          mountPath: /etc/coredns
          readOnly: true
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        - containerPort: 9153
          name: metrics
          protocol: TCP
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 5
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            add:
            - NET_BIND_SERVICE
            drop:
            - all
          readOnlyRootFilesystem: true
      dnsPolicy: Default
      volumes:
        - name: config-volume
          configMap:
            name: coredns
            items:
            - key: Corefile
              path: Corefile
---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "CoreDNS"
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: 10.0.0.2 
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP