记录一下wsl下的使用docker-composer创建etcd集群

因为需要用到etcd，开发环境是wsl，所以要装一下 首先，安装docker，因为是windows10系统，直接安装docker Desktop

安装过程网上多的是，不再赘述。 安装完成后，要把docker调整成wsl

找右上角的齿轮按钮->选择Resources->选择WSL integration-> 设置Enable为wsl，打对号就行了

进入wsl，找一个目录，随便，你觉得舒服的目录就行，最好是空白的目录 比如我的是/root/work_space/etcd_cluster

执行命令创建n个目录，用于存放不同的节点

mkdir -p etcd-node{1,2,3,4,5}

因为我打算创建5个节点，如需要可以删减，最低不要低于3个，因为etcd要求是奇数个。

执行命令构建一个docker网络

docker network create --driver bridge --subnet 172.20.0.0/16 --gateway 172.20.0.1 etcd-cluster

构建docker-compose.yaml文件，注意，这个文件的名字默认最好是docker-compose.yaml，扩展名是yaml，如果你的docker有额外配置，或者指定了某个文件是另一说，如果没有，默认就是这个

version: '3'
 
networks:
  etcd-cluster:
    external: true
 
services:
  etcd-node1:
    image: quay.io/coreos/etcd:v3.5.5
    container_name: etcd-node1
    ports:
      - "12379:2379"
      - "12380:2380"
    restart: always
    volumes:
      - /root/work_space/etcd_cluster/node1:/data/app/etcd
    command: etcd --name etcd-node1 --data-dir /data/app/etcd/ --advertise-client-urls http://172.20.0.10:2379 --initial-advertise-peer-urls http://172.20.0.10:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.20.0.10:2380,etcd-node2=http://172.20.0.11:2380,etcd-node3=http://172.20.0.12:2380,etcd-node4=http://172.20.0.13:2380,etcd-node5=http://172.20.0.14:2380" --initial-cluster-state new
    networks:
      etcd-cluster:
        ipv4_address: 172.20.0.10
 
  etcd-node2:
    image: quay.io/coreos/etcd:v3.5.5
    container_name: etcd-node2
    ports:
      - "12381:2379"
      - "12382:2380"
    restart: always
    volumes:
      - /root/work_space/etcd_cluster/node2:/data/app/etcd
    command: etcd --name etcd-node2 --data-dir /data/app/etcd/ --advertise-client-urls http://172.20.0.11:2379 --initial-advertise-peer-urls http://172.20.0.11:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.20.0.10:2380,etcd-node2=http://172.20.0.11:2380,etcd-node3=http://172.20.0.12:2380,etcd-node4=http://172.20.0.13:2380,etcd-node5=http://172.20.0.14:2380" --initial-cluster-state new
    networks:
      etcd-cluster:
        ipv4_address: 172.20.0.11
 
  etcd-node3:
    image: quay.io/coreos/etcd:v3.5.5
    container_name: etcd-node3
    ports:
      - "12383:2379"
      - "12384:2380"
    restart: always
    volumes:
      - /root/work_space/etcd_cluster/node3:/data/app/etcd
    command: etcd --name etcd-node3 --data-dir /data/app/etcd/ --advertise-client-urls http://172.20.0.12:2379 --initial-advertise-peer-urls http://172.20.0.12:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.20.0.10:2380,etcd-node2=http://172.20.0.11:2380,etcd-node3=http://172.20.0.12:2380,etcd-node4=http://172.20.0.13:2380,etcd-node5=http://172.20.0.14:2380" --initial-cluster-state new
    networks:
      etcd-cluster:
        ipv4_address: 172.20.0.12
 
  etcd-node4:
    image: quay.io/coreos/etcd:v3.5.5
    container_name: etcd-node4
    ports:
      - "12385:2379"
      - "12386:2380"
    restart: always
    volumes:
      - /root/work_space/etcd_cluster/node4:/data/app/etcd
    command: etcd --name etcd-node4 --data-dir /data/app/etcd/ --advertise-client-urls http://172.20.0.13:2379 --initial-advertise-peer-urls http://172.20.0.13:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.20.0.10:2380,etcd-node2=http://172.20.0.11:2380,etcd-node3=http://172.20.0.12:2380,etcd-node4=http://172.20.0.13:2380,etcd-node5=http://172.20.0.14:2380" --initial-cluster-state new
    networks:
      etcd-cluster:
        ipv4_address: 172.20.0.13
 
  etcd-node5:
    image: quay.io/coreos/etcd:v3.5.5
    container_name: etcd-node5
    ports:
      - "12387:2379"
      - "12388:2380"
    restart: always
    volumes:
      - /root/work_space/etcd_cluster/node5:/data/app/etcd
    command: etcd --name etcd-node5 --data-dir /data/app/etcd/ --advertise-client-urls http://172.20.0.14:2379 --initial-advertise-peer-urls http://172.20.0.14:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.20.0.10:2380,etcd-node2=http://172.20.0.11:2380,etcd-node3=http://172.20.0.12:2380,etcd-node4=http://172.20.0.13:2380,etcd-node5=http://172.20.0.14:2380" --initial-cluster-state new
    networks:
      etcd-cluster:
        ipv4_address: 172.20.0.14

这里用的是官方维护的自己的镜像 quay.io/coreos/etcd:v3.5.5 如果有需要可以换成其他的，这个无所谓

执行命令启动etcd集群

docker-compose up -d

第一次启动需要下载镜像，会慢一些

启动完成后，效果如下：