集群 - Docker — 从入门到实践

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集群
下面我们使用 Docker Compose 模拟启动一个 3 节点的 etcd 集群。
编辑 docker-compose.yml 文件
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version: "3.6"
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services:
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​
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  node1:
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    image: quay.io/coreos/etcd:v3.4.0
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    volumes:
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      - node1-data:/etcd-data
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    expose:
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      - 2379
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      - 2380
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    networks:
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      cluster_net:
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        ipv4_address: 172.16.238.100
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    environment:
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      - ETCDCTL_API=3
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    command:
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      - /usr/local/bin/etcd
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      - --data-dir=/etcd-data
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      - --name
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      - node1
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      - --initial-advertise-peer-urls
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      - http://172.16.238.100:2380
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      - --listen-peer-urls
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      - http://0.0.0.0:2380
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      - --advertise-client-urls
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      - http://172.16.238.100:2379
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      - --listen-client-urls
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      - http://0.0.0.0:2379
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      - --initial-cluster
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      - node1=http://172.16.238.100:2380,node2=http://172.16.238.101:2380,node3=http://172.16.238.102:2380
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      - --initial-cluster-state
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      - new
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      - --initial-cluster-token
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      - docker-etcd
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​
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  node2:
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    image: quay.io/coreos/etcd:v3.4.0
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    volumes:
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      - node2-data:/etcd-data
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    networks:
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      cluster_net:
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        ipv4_address: 172.16.238.101
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    environment:
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      - ETCDCTL_API=3
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    expose:
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      - 2379
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      - 2380
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    command:
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      - /usr/local/bin/etcd
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      - --data-dir=/etcd-data
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      - --name
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      - node2
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      - --initial-advertise-peer-urls
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      - http://172.16.238.101:2380
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      - --listen-peer-urls
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      - http://0.0.0.0:2380
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      - --advertise-client-urls
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      - http://172.16.238.101:2379
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      - --listen-client-urls
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      - http://0.0.0.0:2379
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      - --initial-cluster
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      - node1=http://172.16.238.100:2380,node2=http://172.16.238.101:2380,node3=http://172.16.238.102:2380
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      - --initial-cluster-state
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      - new
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      - --initial-cluster-token
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      - docker-etcd
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​
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  node3:
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    image: quay.io/coreos/etcd:v3.4.0
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    volumes:
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      - node3-data:/etcd-data
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    networks:
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      cluster_net:
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        ipv4_address: 172.16.238.102
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    environment:
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      - ETCDCTL_API=3
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    expose:
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      - 2379
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      - 2380
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    command:
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      - /usr/local/bin/etcd
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      - --data-dir=/etcd-data
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      - --name
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      - node3
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      - --initial-advertise-peer-urls
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      - http://172.16.238.102:2380
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      - --listen-peer-urls
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      - http://0.0.0.0:2380
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      - --advertise-client-urls
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      - http://172.16.238.102:2379
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      - --listen-client-urls
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      - http://0.0.0.0:2379
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      - --initial-cluster
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      - node1=http://172.16.238.100:2380,node2=http://172.16.238.101:2380,node3=http://172.16.238.102:2380
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      - --initial-cluster-state
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      - new
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      - --initial-cluster-token
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      - docker-etcd
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​
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volumes:
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  node1-data:
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  node2-data:
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  node3-data:
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​
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networks:
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  cluster_net:
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    driver: bridge
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    ipam:
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      driver: default
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      config:
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      -
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        subnet: 172.16.238.0/24
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使用 docker-compose up 启动集群之后使用 docker exec 命令登录到任一节点测试 etcd 集群。
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/ # etcdctl member list
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daf3fd52e3583ff, started, node3, http://172.16.238.102:2380, http://172.16.238.102:2379
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422a74f03b622fef, started, node1, http://172.16.238.100:2380, http://172.16.238.100:2379
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ed635d2a2dbef43d, started, node2, http://172.16.238.101:2380, http://172.16.238.101:2379
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