一、静态配置部署 etcd 集群

主机名	私网 IP
etcd01	172.17.86.250
etcd02	172.17.86.251
etcd03	172.17.86.252

二、下载并安装

• GitHub 地址：https://github.com/etcd-io/etcd/releases/
• 官网地址：https://etcd.io/docs/v3.5/install/
• k8s地址：https://kubernetes.io/zh/docs/tasks/administer-cluster/configure-upgrade-etcd/

2.1 GitHub安装指导（此处参考）

ETCD_VER=v3.5.0

# choose either URL
GOOGLE_URL=https://storage.googleapis.com/etcd
GITHUB_URL=https://github.com/etcd-io/etcd/releases/download
DOWNLOAD_URL=${GOOGLE_URL}

rm -f /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
rm -rf /tmp/etcd-download-test && mkdir -p /tmp/etcd-download-test

curl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
tar xzvf /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz -C /tmp/etcd-download-test --strip-components=1
rm -f /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz

/tmp/etcd-download-test/etcd --version
/tmp/etcd-download-test/etcdctl version
/tmp/etcd-download-test/etcdutl version

# start a local etcd server
/tmp/etcd-download-test/etcd

# write,read to etcd
/tmp/etcd-download-test/etcdctl --endpoints=localhost:2379 put foo bar
/tmp/etcd-download-test/etcdctl --endpoints=localhost:2379 get foo

2.2 下载并安装

cat get_etcd_package.sh

ETCD_VER=v3.5.0

GOOGLE_URL=https://storage.googleapis.com/etcd
GITHUB_URL=https://github.com/etcd-io/etcd/releases/download
DOWNLOAD_URL=${GITHUB_URL}  #下载地址，二选一，此处选 GITHUB_URL

mkdir -p /usr/local/etcd # 创建安装目录

curl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o /usr/local/etcd-${ETCD_VER}-linux-amd64.tar.gz
tar xzvf /usr/local/etcd-${ETCD_VER}-linux-amd64.tar.gz -C /usr/local/etcd/ --strip-components=1  # 解压并指定解压路径 usr/local/etcd/

#/usr/local/etcd/etcd --version
#/usr/local/etcd/etcdctl version

chmod +x get_etcd_package.sh
sh get_etcd_package.sh

3、创建数据存储目录

mkdir /usr/local/etcd/data

4、设置配置文件
      创建配置文件 /usr/local/etcd/conf.yml，三个节点配置文件内容分别如下：

（1）etcd01：172.17.86.250

name: etcd01
data-dir: /usr/local/etcd/data
initial-advertise-peer-urls: http://172.17.86.250:2380
listen-peer-urls: http://172.17.86.250:2380
listen-client-urls: http://172.17.86.250:2379,http://127.0.0.1:2379
advertise-client-urls: http://172.17.86.250:2379
initial-cluster-token: my-etcd-cluster
initial-cluster: etcd01=http://172.17.86.250:2380,etcd02=http://172.17.86.251:2380,etcd03=http://172.17.86.252:2380
initial-cluster-state: new

（2）etcd02：172.17.86.251

name: etcd02
data-dir: /usr/local/etcd/data
initial-advertise-peer-urls: http://172.17.86.251:2380
listen-peer-urls: http://172.17.86.251:2380
listen-client-urls: http://172.17.86.251:2379,http://127.0.0.1:2379
advertise-client-urls: http://172.17.86.251:2379
initial-cluster-token: my-etcd-cluster
initial-cluster: etcd01=http://172.17.86.250:2380,etcd02=http://172.17.86.251:2380,etcd03=http://172.17.86.252:2380
initial-cluster-state: new

（3）etcd03：172.17.86.252

name: etcd03
data-dir: /usr/local/etcd/data
initial-advertise-peer-urls: http://172.17.86.252:2380
listen-peer-urls: http://172.17.86.252:2380
listen-client-urls: http://172.17.86.252:2379,http://127.0.0.1:2379
advertise-client-urls: http://172.17.86.252:2379
initial-cluster-token: my-etcd-cluster
initial-cluster: etcd01=http://172.17.86.250:2380,etcd02=http://172.17.86.251:2380,etcd03=http://172.17.86.252:2380
initial-cluster-state: new

（4）配置参数说明：
	name：当前etcd节点名称。
	data-dir：数据存储目录。
	initial-advertise-peer-urls：集群的其他节点通过该地址与当前节点通信。
	listen-peer-urls：当前节点通过该地址监听集群其他节点发送的信息。
	listen-client-urls：当前节点通过该地址监听客户端发送的信息。
	advertise-client-urls：客户端通过该地址与当前节点通信
	initial-cluster-token：用于区分不同的集群，同一集群的所有节点配置相同的值。
	initial-cluster：当前集群的所有节点信息，当前节点根据此信息与其他节点取得联系。
	initial-cluster-state： 本次是否为新建集群，有两个取值：new和existing。

三、开放端口（此处不执行，仅供参考）

etcd server默认使用2379端口监听客户端的请求，使用2380端口监听其他server的请求。本文配置使用的也是2379和2380两个端口。

（1）开放 2379 和 2380 两个端口：

firewall-cmd --zone=public --add-port=2379/tcp --permanent
firewall-cmd --zone=public --add-port=2380/tcp --permanent

（2）重启防火墙：

firewall-cmd --reload

（3）验证端口是否开放成功：

firewall-cmd --zone=public --query-port=2379/tcp
firewall-cmd --zone=public --query-port=2380/tcp

四、配置服务

（1）创建服务配置文件 /usr/lib/systemd/system/etcd.service，内容如下：

[Unit]
Description=etcd
After=network.target
 
[Service]
Type=notify
ExecStart=/usr/local/etcd/etcd --config-file=/usr/local/etcd/conf.yml
 
[Install]
WantedBy=multi-user.target

（2）启动服务：

systemctl daemon-reload
systemctl start etcd.service

（3）查看服务是否启动成功：

systemctl status etcd.service

（4）设置服务为开机自启动：

systemctl enable etcd.service

五、验证

（1）将 etcdctl 二进制文件复制到 /usr/local/bin/ 目录下，方便执行命令：

cp /usr/local/etcd/etcdctl /usr/local/bin/

（2）查看集群成员列表：

[root@etcd02 etcd]# etcdctl member list

6af7376e529f02f, started, etcd03, http://172.17.86.252:2380, http://172.17.86.252:2379, false
6e7aa2f6e450a1e7, started, etcd02, http://172.17.86.251:2380, http://172.17.86.251:2379, false
f9509c61761f7beb, started, etcd01, http://172.17.86.250:2380, http://172.17.86.250:2379, false

（3）查看集群LEADER：

etcdctl --endpoints=http://172.17.86.250:2380,http://172.17.86.251:2380,http://172.17.86.252:2380 endpoint status  -w table

（4）查看集群健康状况：

[root@etcd02 etcd]# etcdctl --endpoints=http://172.17.86.250:2380,http://172.17.86.251:2380,http://172.17.86.252:2380 endpoint health
http://172.17.86.252:2380 is healthy: successfully committed proposal: took = 2.120406ms
http://172.17.86.251:2380 is healthy: successfully committed proposal: took = 2.086449ms
http://172.17.86.250:2380 is healthy: successfully committed proposal: took = 2.090922ms