# 集群 下面我们使用 [Docker Compose](../compose/) 模拟启动一个 3 节点的 `etcd` 集群。 编辑 `docker-compose.yml` 文件 ```yaml version: "3.6" services: node1: image: quay.io/coreos/etcd:v3.4.0 volumes: - node1-data:/etcd-data expose: - 2379 - 2380 networks: cluster_net: ipv4_address: 172.16.238.100 environment: - ETCDCTL_API=3 command: - /usr/local/bin/etcd - --data-dir=/etcd-data - --name - node1 - --initial-advertise-peer-urls - http://172.16.238.100:2380 - --listen-peer-urls - http://0.0.0.0:2380 - --advertise-client-urls - http://172.16.238.100:2379 - --listen-client-urls - http://0.0.0.0:2379 - --initial-cluster - node1=http://172.16.238.100:2380,node2=http://172.16.238.101:2380,node3=http://172.16.238.102:2380 - --initial-cluster-state - new - --initial-cluster-token - docker-etcd node2: image: quay.io/coreos/etcd:v3.4.0 volumes: - node2-data:/etcd-data networks: cluster_net: ipv4_address: 172.16.238.101 environment: - ETCDCTL_API=3 expose: - 2379 - 2380 command: - /usr/local/bin/etcd - --data-dir=/etcd-data - --name - node2 - --initial-advertise-peer-urls - http://172.16.238.101:2380 - --listen-peer-urls - http://0.0.0.0:2380 - --advertise-client-urls - http://172.16.238.101:2379 - --listen-client-urls - http://0.0.0.0:2379 - --initial-cluster - node1=http://172.16.238.100:2380,node2=http://172.16.238.101:2380,node3=http://172.16.238.102:2380 - --initial-cluster-state - new - --initial-cluster-token - docker-etcd node3: image: quay.io/coreos/etcd:v3.4.0 volumes: - node3-data:/etcd-data networks: cluster_net: ipv4_address: 172.16.238.102 environment: - ETCDCTL_API=3 expose: - 2379 - 2380 command: - /usr/local/bin/etcd - --data-dir=/etcd-data - --name - node3 - --initial-advertise-peer-urls - http://172.16.238.102:2380 - --listen-peer-urls - http://0.0.0.0:2380 - --advertise-client-urls - http://172.16.238.102:2379 - --listen-client-urls - http://0.0.0.0:2379 - --initial-cluster - node1=http://172.16.238.100:2380,node2=http://172.16.238.101:2380,node3=http://172.16.238.102:2380 - --initial-cluster-state - new - --initial-cluster-token - docker-etcd volumes: node1-data: node2-data: node3-data: networks: cluster_net: driver: bridge ipam: driver: default config: - 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。 ```bash / # etcdctl member list daf3fd52e3583ff, started, node3, http://172.16.238.102:2380, http://172.16.238.102:2379 422a74f03b622fef, started, node1, http://172.16.238.100:2380, http://172.16.238.100:2379 ed635d2a2dbef43d, started, node2, http://172.16.238.101:2380, http://172.16.238.101:2379 ```