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。
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
[[email protected] ~]# cd /
[[email protected] /]# 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
[[email protected] k8s]# curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
[[email protected] k8s]# curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
[[email protected] k8s]# curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
[[email protected] 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
[[email protected] 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
[[email protected] 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
[[email protected] k8s]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
[[email protected] 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
[[email protected] 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
[[email protected] k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
[[email protected] 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
[[email protected] 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
[[email protected] k8s]# mkdir -p /opt/etcd/{cfg,bin,ssl}
[[email protected] k8s]# ls /opt/etcd/
bin cfg ssl
//将etcd中的文件分门别类存放
[[email protected] k8s]# mv etcd-v3.3.10-linux-amd64/etcd /opt/etcd/bin/
[[email protected] k8s]# mv etcd-v3.3.10-linux-amd64/etcdctl /opt/etcd/bin/
[[email protected] k8s]# cp -p *.pem /opt/etcd/ssl/
//etcd命令文件
[[email protected] k8s]# ls /opt/etcd/bin/
etcd etcdctl
//etcd证书
[[email protected] k8s]# ls /opt/etcd/ssl/
ca-key.pem ca.pem server-key.pem server.pem建立etcd配置文件
[[email protected] 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
[[email protected] 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
[[email protected] ~]# scp -r /opt/etcd/ [email protected]:/opt/
[[email protected] ~]# scp -r /opt/etcd/ [email protected]:/opt/
//推送启动脚本
[[email protected] ~]# scp /usr/lib/systemd/system/etcd.service [email protected]:/usr/lib/systemd/system/
[[email protected] ~]# scp /usr/lib/systemd/system/etcd.service [email protected]:/usr/lib/systemd/system/
node端方面
更改各node节点收到的配置文件
node1
[[email protected] 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
[[email protected] ~]# 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
[[email protected] etcd]# systemctl stop firewalld.service
[[email protected] etcd]# setenforce 0
[[email protected] etcd]# systemctl disable firewalld.service
//开启etcd服务
[[email protected] etcd]# systemctl start etcd
[[email protected] 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
[[email protected] ~]# /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
[[email protected] ~]# /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~~~
原文地址：https://blog.51cto.com/14484404/2469221
时间： 2024-07-29 10:53:39