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

    1. version: "3.6"
    2. services:
    4.   node1:
    5.     image: quay.io/coreos/etcd:v3.4.0
    6.     volumes:
    7.       - node1-data:/etcd-data
    8.     expose:
    9.       - 2379
    10.       - 2380
    11.     networks:
    12.       cluster_net:
    13.         ipv4_address: 172.16.238.100
    14.     environment:
    15.       - ETCDCTL_API=3
    16.     command:
    17.       - /usr/local/bin/etcd
    18.       - --data-dir=/etcd-data
    19.       - --name
    20.       - node1
    21.       - --initial-advertise-peer-urls
    22.       - http://172.16.238.100:2380
    23.       - --listen-peer-urls
    24.       - http://0.0.0.0:2380
    25.       - --advertise-client-urls
    26.       - http://172.16.238.100:2379
    27.       - --listen-client-urls
    28.       - http://0.0.0.0:2379
    29.       - --initial-cluster
    30.       - node1=http://172.16.238.100:2380,node2=http://172.16.238.101:2380,node3=http://172.16.238.102:2380
    31.       - --initial-cluster-state
    32.       - new
    33.       - --initial-cluster-token
    34.       - docker-etcd
    36.   node2:
    37.     image: quay.io/coreos/etcd:v3.4.0
    38.     volumes:
    39.       - node2-data:/etcd-data
    40.     networks:
    41.       cluster_net:
    42.         ipv4_address: 172.16.238.101
    43.     environment:
    44.       - ETCDCTL_API=3
    45.     expose:
    46.       - 2379
    47.       - 2380
    48.     command:
    49.       - /usr/local/bin/etcd
    50.       - --data-dir=/etcd-data
    51.       - --name
    52.       - node2
    53.       - --initial-advertise-peer-urls
    54.       - http://172.16.238.101:2380
    55.       - --listen-peer-urls
    56.       - http://0.0.0.0:2380
    57.       - --advertise-client-urls
    58.       - http://172.16.238.101:2379
    59.       - --listen-client-urls
    60.       - http://0.0.0.0:2379
    61.       - --initial-cluster
    62.       - node1=http://172.16.238.100:2380,node2=http://172.16.238.101:2380,node3=http://172.16.238.102:2380
    63.       - --initial-cluster-state
    64.       - new
    65.       - --initial-cluster-token
    66.       - docker-etcd
    68.   node3:
    69.     image: quay.io/coreos/etcd:v3.4.0
    70.     volumes:
    71.       - node3-data:/etcd-data
    72.     networks:
    73.       cluster_net:
    74.         ipv4_address: 172.16.238.102
    75.     environment:
    76.       - ETCDCTL_API=3
    77.     expose:
    78.       - 2379
    79.       - 2380
    80.     command:
    81.       - /usr/local/bin/etcd
    82.       - --data-dir=/etcd-data
    83.       - --name
    84.       - node3
    85.       - --initial-advertise-peer-urls
    86.       - http://172.16.238.102:2380
    87.       - --listen-peer-urls
    88.       - http://0.0.0.0:2380
    89.       - --advertise-client-urls
    90.       - http://172.16.238.102:2379
    91.       - --listen-client-urls
    92.       - http://0.0.0.0:2379
    93.       - --initial-cluster
    94.       - node1=http://172.16.238.100:2380,node2=http://172.16.238.101:2380,node3=http://172.16.238.102:2380
    95.       - --initial-cluster-state
    96.       - new
    97.       - --initial-cluster-token
    98.       - docker-etcd
    100. volumes:
    101.   node1-data:
    102.   node2-data:
    103.   node3-data:
    105. networks:
    106.   cluster_net:
    107.     driver: bridge
    108.     ipam:
    109.       driver: default
    110.       config:
    111.       -
    112.         subnet: 172.16.238.0/24

    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。

    1. / # etcdctl member list
    2. daf3fd52e3583ff, started, node3, http://172.16.238.102:2380, http://172.16.238.102:2379
    3. 422a74f03b622fef, started, node1, http://172.16.238.100:2380, http://172.16.238.100:2379
    4. ed635d2a2dbef43d, started, node2, http://172.16.238.101:2380, http://172.16.238.101:2379