docker-compose部署etcd集群的实现步骤

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编写docker-compose.yml

version: "3.0"

networks:
  etcd-net:           # 网络
    driver: bridge    # 桥接模式

volumes:
  etcd1_data:         # 挂载到本地的数据卷名
    driver: local
  etcd2_data:
    driver: local
  etcd3_data:
    driver: local
###
### etcd 其他环境配置见：https://doczhcn.gitbook.io/etcd/index/index-1/configuration
###
services:
  etcd1:
    image: bitnami/etcd:latest  # 镜像
    container_name: etcd1       # 容器名 --name
    restart: always             # 总是重启
    networks:
      - etcd-net                # 使用的网络 --network
    ports:                      # 端口映射 -p
      - "20000:2379"
      - "20001:2380"
    environment:                # 环境变量 --env
      - ALLOW_NONE_AUTHENTICATION=yes                       # 允许不用密码登录
      - ETCD_NAME=etcd1                                     # etcd 的名字
      - ETCD_INITIAL_ADVERTISE_PEER_URLS=http://etcd1:2380  # 列出这个成员的伙伴 URL 以便通告给集群的其他成员
      - ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380           # 用于监听伙伴通讯的URL列表
      - ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379         # 用于监听客户端通讯的URL列表
      - ETCD_ADVERTISE_CLIENT_URLS=http://etcd1:2379        # 列出这个成员的客户端URL，通告给集群中的其他成员
      - ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster             # 在启动期间用于 etcd 集群的初始化集群记号
      - ETCD_INITIAL_CLUSTER=etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380 # 为启动初始化集群配置
      - ETCD_INITIAL_CLUSTER_STATE=new                      # 初始化集群状态
    volumes:
      - etcd1_data:/bitnami/etcd                            # 挂载的数据卷

  etcd2:
    image: bitnami/etcd:latest
    container_name: etcd2
    restart: always
    networks:
      - etcd-net
    ports:
      - "20002:2379"
      - "20003:2380"
    environment:
      - ALLOW_NONE_AUTHENTICATION=yes
      - ETCD_NAME=etcd2
      - ETCD_INITIAL_ADVERTISE_PEER_URLS=http://etcd2:2380
      - ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380
      - ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379
      - ETCD_ADVERTISE_CLIENT_URLS=http://etcd2:2379
      - ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster
      - ETCD_INITIAL_CLUSTER=etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380
      - ETCD_INITIAL_CLUSTER_STATE=new
    volumes:
      - etcd2_data:/bitnami/etcd

  etcd3:
    image: bitnami/etcd:latest
    container_name: etcd3
    restart: always
    networks:
      - etcd-net
    ports:
      - "20004:2379"
      - "20005:2380"
    environment:
      - ALLOW_NONE_AUTHENTICATION=yes
      - ETCD_NAME=etcd3
      - ETCD_INITIAL_ADVERTISE_PEER_URLS=http://etcd3:2380
      - ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380
      - ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379
      - ETCD_ADVERTISE_CLIENT_URLS=http://etcd3:2379
      - ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster
      - ETCD_INITIAL_CLUSTER=etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380
      - ETCD_INITIAL_CLUSTER_STATE=new
    volumes:
      - etcd3_data:/bitnami/etcd

运行docker-compose

[root@centos8 etcdtest]# tree
.
└── docker-compose.yml

0 directories, 1 file
[root@centos8 etcdtest]# docker-compose up -d
[+] Running 4/4
 ⠿ Network etcdtest_etcd-net  Created                                                                                                                                 0.1s
 ⠿ Container etcd3            Started                                                                                                                                 0.6s
 ⠿ Container etcd1            Started                                                                                                                                 0.7s
 ⠿ Container etcd2            Started                                                                                                                                 0.7s
[root@centos8 etcdtest]#

检查搭建状态

查看节点启动情况

[root@centos8 etcdtest]# docker ps
CONTAINER ID   IMAGE                 COMMAND                  CREATED          STATUS          PORTS                                                                                      NAMES
89469f98491f   bitnami/etcd:latest   "/opt/bitnami/script…"   54 seconds ago   Up 53 seconds   0.0.0.0:20004->2379/tcp, :::20004->2379/tcp, 0.0.0.0:20005->2380/tcp, :::20005->2380/tcp   etcd3
5454f5a719a2   bitnami/etcd:latest   "/opt/bitnami/script…"   54 seconds ago   Up 53 seconds   0.0.0.0:20000->2379/tcp, :::20000->2379/tcp, 0.0.0.0:20001->2380/tcp, :::20001->2380/tcp   etcd1
bf989f9512b5   bitnami/etcd:latest   "/opt/bitnami/script…"   54 seconds ago   Up 53 seconds   0.0.0.0:20002->2379/tcp, :::20002->2379/tcp, 0.0.0.0:20003->2380/tcp, :::20003->2380/tcp   etcd2

查看挂载的数据卷

[root@centos8 etcdtest]# docker volume ls
DRIVER    VOLUME NAME
local     etcdtest_etcd1_data
local     etcdtest_etcd2_data
local     etcdtest_etcd3_data

[root@centos8 etcdtest]# docker inspect etcd1 

"Mounts": [
    {
        "Type": "volume",
        "Name": "etcdtest_etcd1_data",
        "Source": "/var/lib/docker/volumes/etcdtest_etcd1_data/_data",
        "Destination": "/bitnami/etcd",
        "Driver": "local",
        "Mode": "z",
        "RW": true,
        "Propagation": ""
    }
]

测试节点

从etcd1写一个key

[root@centos8 etcdtest]# docker exec -it etcd1 bash
I have no name!@5454f5a719a2:/opt/bitnami/etcd$ etcdctl put name "i am wxf"
OK

从etcd2读一个value

[wxf@centos8 ~]$ docker exec -it etcd2 bash
I have no name!@bf989f9512b5:/opt/bitnami/etcd$ etcdctl get name
name
i am wxf

搭建成功！

Golang 与 etcd 简单交互

package main

import (
 "context"
 "fmt"
 "go.etcd.io/etcd/client/v3"
 "time"
)

func main() {
 cli, err := clientv3.New(clientv3.Config{
  Endpoints:   []string{"http://192.168.135.10:20000", "http://192.168.135.10:20002", "http://192.168.135.10:20004"},
  DialTimeout: 5 * time.Second,
 })
 if err != nil {
  fmt.Printf("connect to etcd failed, err:%v\n", err)
  return
 }
 defer cli.Close()
 fmt.Println("connect to etcd success")
 defer cli.Close()

 go Watch(cli)

 Create(cli)
 Read(cli)
 Delete(cli)
 Update(cli)
 select {}
}

func Watch(cli *clientv3.Client) {
 rch := cli.Watch(context.Background(), "name") // type WatchChan <-chan WatchResponse
 for wresp := range rch {
  for _, ev := range wresp.Events {
   fmt.Printf("Type: %s Key:%s Value:%s\n", ev.Type, ev.Kv.Key, ev.Kv.Value)
  }
 }
 fmt.Println("out")
}

func Create(cli *clientv3.Client) {
 // put
 ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 _, err := cli.Put(ctx, "name", "wxf")
 cancel()
 if err != nil {
  fmt.Printf("put to etcd failed, err:%v\n", err)
  return
 }
}

func Read(cli *clientv3.Client) {
 //get
 ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 resp, err := cli.Get(ctx, "name")
 cancel()
 if err != nil {
  fmt.Printf("get from etcd failed, err:%v\n", err)
  return
 }
 for _, ev := range resp.Kvs {
  fmt.Printf("Type: %s Key:%s Value:%s\n", "READ", ev.Key, ev.Value)
 }
}

func Update(cli *clientv3.Client) {
 // put
 ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 _, err := cli.Put(ctx, "name", "xyy")
 cancel()
 if err != nil {
  fmt.Printf("put to etcd failed, err:%v\n", err)
  return
 }
}

func Delete(cli *clientv3.Client) {
 //del
 ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 _, err := cli.Delete(ctx, "name")
 cancel()
 if err != nil {
  fmt.Printf("delete from etcd failed, err:%v\n", err)
  return
 }
}

go run main.go

connect to etcd success
Type: PUT Key:name Value:wxf
Type: READ Key:name Value:wxf
Type: DELETE Key:name Value:
Type: PUT Key:name Value:xyy
Type: PUT Key:name Value:test for terminal
Type: PUT Key:name Value:test for terminal aabbccdd

I have no name!@5454f5a719a2:/opt/bitnami/etcd$ etcdctl put name "test for terminal"
OK
I have no name!@5454f5a719a2:/opt/bitnami/etcd$ etcdctl put name "test for terminal aabbccdd"
OK

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