etcd集群搭建

环境配置

etcd-v3.5.0

192.168.108.128 节点1

192.168.108.129 节点2

192.168.108.130 节点3

ETCD下载

https://github.com/etcd-io/etcd/releases/download/v3.5.0/etcd-v3.5.0-linux-amd64.tar.gz

ETCD安装配置

 

• 解压安装：

$ tar -zxvf  etcd-v3.5.0-linux-amd64.tar.gz -C /opt/
$ cd /opt
$ mv etcd-v3.5.0-linux-amd64  etcd-v3.5.0
$ mkdir /etc/etcd           # 创建etcd配置文件目录

 

• 创建etcd配置文件：

$ vi /etc/etcd/conf.yml

节点1，添加如下内容：

name: etcd-1

data-dir: /opt/etcd-v3.5.0/data

listen-client-urls: http://192.168.108.128:2379,http://127.0.0.1:2379

advertise-client-urls: http://192.168.108.128:2379,http://127.0.0.1:2379

listen-peer-urls: http://192.168.108.128:2380

initial-advertise-peer-urls: http://192.168.108.128:2380

initial-cluster: etcd-1=http://192.168.108.128:2380,etcd-2=http://192.168.108.129:2380,etcd-3=http://192.168.108.130:2380

initial-cluster-token: etcd-cluster-token

initial-cluster-state: new

 

节点2，添加如下内容：

name: etcd-2

data-dir: /opt/etcd-v3.5.0/data

listen-client-urls: http://192.168.108.129:2379,http://127.0.0.1:2379

advertise-client-urls: http://192.168.108.129:2379,http://127.0.0.1:2379

listen-peer-urls: http://192.168.108.129:2380

initial-advertise-peer-urls: http://192.168.108.129:2380

initial-cluster: etcd-1=http://192.168.108.128:2380,etcd-2=http://192.168.108.129:2380,etcd-3=http://192.168.108.130:2380

initial-cluster-token: etcd-cluster-token

initial-cluster-state: new

 

节点3，添加如下内容：

name: etcd-3

data-dir: /opt/etcd-v3.5.0/data

listen-client-urls: http://192.168.108.130:2379,http://127.0.0.1:2379

advertise-client-urls: http://192.168.108.130:2379,http://127.0.0.1:2379

listen-peer-urls: http://192.168.108.130:2380

initial-advertise-peer-urls: http://192.168.108.130:2380

initial-cluster: etcd-1=http://192.168.108.128:2380,etcd-2=http://192.168.108.129:2380,etcd-3=http://192.168.108.130:2380

initial-cluster-token: etcd-cluster-token

initial-cluster-state: new

 

• 更新etcd系统默认配置：

当前使用的是etcd v3版本，系统默认的是v2，通过下面命令修改配置。

$ vi /etc/profile

在末尾追加

export ETCDCTL_API=3

$ source /etc/profile

 

ETCD命令

$ cd /opt/etcd-v3.5.0

 

• 创建etcd配置文件：

$ ./etcdctl version

etcdctl version: 3.5.0
API version: 3.5

• 启动命令：

$ ./etcd --config-file=/etc/etcd/conf.yml

 

• 查看集群成员信息：

$ ./etcdctl member list
2618ce5cd761aa8e: name=etcd-3 peerURLs=http://192.168.108.130:2380 clientURLs=http://127.0.0.1:2379,http://192.168.108.130:2379 isLeader=false
9c359d48a2f34938: name=etcd-1 peerURLs=http://192.168.108.128:2380 clientURLs=http://127.0.0.1:2379,http://192.168.108.128:2379 isLeader=false
f3c45714407d68f3: name=etcd-2 peerURLs=http://192.168.108.129:2380 clientURLs=http://127.0.0.1:2379,http://192.168.108.129:2379 isLeader=true

• 查看集群状态（Leader节点）：

$ ./etcdctl endpoint health --endpoints=192.168.108.130:2380

192.168.108.130:2380 is healthy: successfully committed proposal: took = 4.780312ms cluster is healthy

 

ECTD读写操作

基于HTTP协议的API使用起来比较简单，这里主要通过etcdctl和curl两种方式来做简单介绍。

下面通过给message key设置Hello值示例：

$ ./etcdctl put /message Hello

OK

读取message的值：

$ ./etcdctl get /message

/message
Hello

删除message key：

$ ./etcdctl del /message

1

说明：因为是集群，所以message在其中一个节点创建后，在集群中的任何节点都可以查询到。

 

配置ETCD为启动服务

 

编辑/usr/lib/systemd/system/etcd.service，添加下面内容：

 

[Unit]

Description=Etcd Server

After=network.target

After=network-online.target

Wants=network-online.target

[Service]

Type=notify

WorkingDirectory=/home/bea2/etcd/etcd-v3.5.0/

# User=etcd

ExecStart=/home/bea2/etcd/etcd-v3.5.0/etcd --config-file=/home/bea2/etcd/etcd-v3.5.0/conf/conf.yml

Restart=on-failure

LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

 

 

更新启动：

systemctl daemon-reload
systemctl enable etcd
systemctl start etcd
systemctl restart etcd

systemctl status etcd.service -l