etcd 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

  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