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首页 > 系统 > Linux教程

docker-compose部署etcd集群的实现步骤

admin Linux教程 2022-02-10 05:17:58 docker-compose部署etcd集群   docker   compose部署etcd"
目录

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

到此这篇关于docker-compose部署etcd集群的实现步骤的文章就介绍到这了,更多相关docker-compose部署etcd集群内容请搜索潘少俊衡以前的文章或继续浏览下面的相关文章希望大家以后多多支持潘少俊衡！

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