etcd 集群

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集群包含三个node：etcd1, etcd2, etcd3

1> 下载镜像

docker pull quay.io/coreos/etcd

2>docker-compose.yaml

version: '2'
networks:
  byfn:

services:
  etcd1:
    image: quay.io/coreos/etcd
    container_name: etcd1
    command: etcd -name etcd1 -advertise-client-urls http://0.0.0.0:2379 -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 "etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380" -initial-cluster-state new
    ports:
      - 2379
      - 2380
    networks:
      - byfn

  etcd2:
    image: quay.io/coreos/etcd
    container_name: etcd2
    command: etcd -name etcd2 -advertise-client-urls http://0.0.0.0:2379 -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 "etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380" -initial-cluster-state new
    ports:
      - 2379
      - 2380
    networks:
      - byfn

  etcd3:
    image: quay.io/coreos/etcd
    container_name: etcd3
    command: etcd -name etcd3 -advertise-client-urls http://0.0.0.0:2379 -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 "etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380" -initial-cluster-state new
    ports:
      - 2379
      - 2380
    networks:
      - byfn

docker-compose up

启动后
D:\gopromod\zz.etcd.group
λ

 docker ps

CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS              PORTS                                              NAMES
a8169434bef3        quay.io/coreos/etcd   "etcd -name etcd2 -a…"   41 seconds ago      Up 37 seconds       0.0.0.0:32773->2379/tcp, 0.0.0.0:32772->2380/tcp   etcd2
12ca0bb9666f        quay.io/coreos/etcd   "etcd -name etcd3 -a…"   41 seconds ago      Up 38 seconds       0.0.0.0:32771->2379/tcp, 0.0.0.0:32770->2380/tcp   etcd3
c704a36cb8e6        quay.io/coreos/etcd   "etcd -name etcd1 -a…"   41 seconds ago      Up 38 seconds       0.0.0.0:32769->2379/tcp, 0.0.0.0:32768->2380/tcp   etcd1
49b682bdbf1f        v3_nginx              "nginx -g 'daemon of…"   6 weeks ago         Up 20 minutes       0.0.0.0:80->80/tcp                                 v3_nginx_1
dce9cd05611e        v3_php-fpm            "/docker-entrypoint.…"   6 weeks ago         Up 20 minutes       0.0.0.0:9000->9000/tcp                             v3_php-fpm_1

docker exec -t etcd1 etcdctl member list

ade526d28b1f92f7: name=etcd1 peerURLs=http://etcd1:2380 clientURLs=http://0.0.0.0:2379 isLeader=true
bd388e7810915853: name=etcd3 peerURLs=http://etcd3:2380 clientURLs=http://0.0.0.0:2379 isLeader=false
d282ac2ce600c1ce: name=etcd2 peerURLs=http://etcd2:2380 clientURLs=http://0.0.0.0:2379 isLeader=false

D:\gopromod\zz.etcd.group
λ

docker exec -t etcd3 etcdctl -C

http://etcd1:2379,http://etcd2:2379,http://etcd3:2379 member list
ade526d28b1f92f7: name=etcd1 peerURLs=http://etcd1:2380 clientURLs=http://0.0.0.0:2379 isLeader=true
bd388e7810915853: name=etcd3 peerURLs=http://etcd3:2380 clientURLs=http://0.0.0.0:2379 isLeader=false
d282ac2ce600c1ce: name=etcd2 peerURLs=http://etcd2:2380 clientURLs=http://0.0.0.0:2379 isLeader=false

测试数据：

curl -L http://127.0.0.1:32773/v2/keys/foo -XPUT -d value="Hello foo"
curl -L http://127.0.0.1:32769/v2/keys/foo1/foo1 -XPUT -d value="Hello foo1"
curl -L http://127.0.0.1:32773/v2/keys/foo2/foo2 -XPUT -d value="Hello foo2"
curl -L http://127.0.0.1:32773/v2/keys/foo2/foo21/foo21 -XPUT -d value="Hello foo21"
curl -L http://127.0.0.1:32771/v2/keys/foo
curl -L http://127.0.0.1:32771/v2/keys/foo2
curl -L http://127.0.0.1:32771/v2/keys/foo2?recursive=true

https://github.com/moonlong/etcd-discovery/blob/master/discovery/master.go

https://yuerblog.cc/2017/12/12/etcd-v3-sdk-usage/
raft 算法 https://github.com/maemual/raft-zh_cn/blob/master/raft-zh_cn.md