实验环境规划
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。
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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 |
| 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
安装ETCD数据库（三节点备份）
master端方面
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 < ca-csr.json <
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 <
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 </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 </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
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
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~~~
名称栏目：K8S单master部署一：环境规划、ETCD部署
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