实验环境规划

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概述

使用VMwork虚拟机部署单master双node的小型集群，并且在master和node上都安装etcd来实现etcd集群。

软件采用版本

软件名称	版本
Linux系统	Linux version 4.8.5
Kubernetes	1.9
Docker	Docker version 19.03.5
Etcd	v3.3.10

服务器角色分配

角色	地址	安装组件
master	192.168.142.220	kube-apiserver kube-controller-manager kube-scheduler etcd
node1	192.168.142.136	kubelet kube-proxy docker flannel etcd
node2	192.168.142.132	kubelet kube-proxy docker flannel etcd

前期注意

所有实验虚拟机均已关闭selinux核心防护功能

建立工作目录用于存放二进制软件包

[root@master ~]# cd /
[root@master /]# mkdir k8s

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安装ETCD数据库（三节点备份）

master端方面

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下载ca证书创建、管理工具cfssl

[root@master k8s]# curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
[root@master k8s]# curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
[root@master k8s]# curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
[root@master k8s]# chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo

生成ca证书

//定义ca证书，生成ca证书配置文件
[root@master k8s]# cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "www": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

//生成证书签名文件
[root@master k8s]# cat > ca-csr.json <<EOF
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing"
        }
    ]
}
EOF

//生成ca证书，ca.pem、ca-key.pem
[root@master k8s]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

[root@master k8s]# ls
ca-config.json  ca-csr.json  ca.pem   ca.csr     ca-key.pem   
“ca.pem”         //ca证书文件
“ca-key.pem”         //ca密钥证书文件

生成etcd各节点之间通信证书

（注意IP地址的变化）

//生成etcd节点之间的通信验证签名
//节点地址必须要更改
[root@master k8s]# cat > server-csr.json <<EOF
{
    "CN": "etcd",
    "hosts": [
    "192.168.142.220",
    "192.168.142.136",
    "192.168.142.132"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}
EOF

//生成ETCD通信证书，用于etcd之间通信验证
[root@master k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

[root@master k8s]# ls
ca-config.json  ca-csr.json  ca.pem        server.csr       server-key.pem
ca.csr          ca-key.pem   etcd-cert.sh  server-csr.json  server.pem
“server.pem”&“server-key.pem”      //etcd之间通信的验证证书

配置etcd二进制文件包

//解压安装etcd
[root@master k8s]# tar zxf etcd-v3.3.10-linux-amd64.tar.gz

//建立存放etcd配置文件、命令、证书的目录
[root@master k8s]# mkdir -p /opt/etcd/{cfg,bin,ssl}
[root@master k8s]# ls /opt/etcd/
bin  cfg  ssl

//将etcd中的文件分门别类存放
[root@master k8s]# mv etcd-v3.3.10-linux-amd64/etcd /opt/etcd/bin/
[root@master k8s]# mv etcd-v3.3.10-linux-amd64/etcdctl /opt/etcd/bin/
[root@master k8s]# cp -p *.pem /opt/etcd/ssl/
    
//etcd命令文件
[root@master k8s]# ls /opt/etcd/bin/
etcd  etcdctl

//etcd证书
[root@master k8s]# ls /opt/etcd/ssl/
ca-key.pem  ca.pem  server-key.pem  server.pem

建立etcd配置文件

[root@master k8s]# cat <<EOF >/opt/etcd/cfg/etcd
//[Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.142.220:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.142.220:2379"

//[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.142.220:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.142.220:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.142.220:2380,etcd02=https://192.168.142.136:2380,etcd03=https://192.168.142.132:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

建立etcd启动脚本

[root@master k8s]# cat <<EOF >/usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd
ExecStart=/opt/etcd/bin/etcd \
--name=etcd01 \
--data-dir=\${ETCD_DATA_DIR} \
--listen-peer-urls=\${ETCD_LISTEN_PEER_URLS} \
--listen-client-urls=\${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
--advertise-client-urls=\${ETCD_ADVERTISE_CLIENT_URLS} \
--initial-advertise-peer-urls=\${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
--initial-cluster=\${ETCD_INITIAL_CLUSTER} \
--initial-cluster-token=\${ETCD_INITIAL_CLUSTER_TOKEN} \
--initial-cluster-state=new \
--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
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

推送证书、配置文件、启动脚本至node节点上

//将证书、配置文件推送至其它节点
[root@master ~]# scp -r /opt/etcd/ root@192.168.142.136:/opt/
[root@master ~]# scp -r /opt/etcd/ root@192.168.142.132:/opt/

//推送启动脚本
[root@master ~]# scp /usr/lib/systemd/system/etcd.service root@192.168.142.136:/usr/lib/systemd/system/
[root@master ~]# scp /usr/lib/systemd/system/etcd.service root@192.168.142.132:/usr/lib/systemd/system/

node端方面

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更改各node节点收到的配置文件

node1

[root@node1 etcd]# vim /opt/etcd/cfg/etcd
//[Member]
ETCD_NAME="etcd02"                      //节点名称
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.142.136:2380"               //节点地址
ETCD_LISTEN_CLIENT_URLS="https://192.168.142.136:2379"               //节点地址

//[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.142.136:2380"               //节点地址
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.142.136:2379"               //节点地址

node 2

[root@node2 ~]# vim /opt/etcd/cfg/etcd
//[Member]
ETCD_NAME="etcd03"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.142.132:2380"                      //节点名称
ETCD_LISTEN_CLIENT_URLS="https://192.168.142.132:2379"                      //节点名称

//[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.142.132:2380"                      //节点名称
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.142.132:2379"                      //节点名称

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所有节点！！！！

开启服务

//各节点关防火墙
[root@node1 etcd]# systemctl stop firewalld.service
[root@node1 etcd]# setenforce 0
[root@node1 etcd]# systemctl disable firewalld.service

//开启etcd服务
[root@node1 etcd]# systemctl start etcd
[root@node1 etcd]# systemctl enable etcd

群集健康检查，查看群集成员

//群集各节点健康检查
[root@master ~]# /opt/etcd/bin/etcdctl --ca-file=/opt/etcd/ssl/ca.pem \
--cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem \
--endpoints="https://192.168.142.220:2379,https://192.168.142.136:2379,https://192.168.142.132:2379" \
cluster-health

//查看etcd群集成员
[root@master ~]# /opt/etcd/bin/etcdctl --ca-file=/opt/etcd/ssl/ca.pem \
--cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem \
--endpoints="https://192.168.142.220:2379,https://192.168.142.136:2379,https://192.168.142.132:2379" member list

未完待续~~~