etcd docker-compose 跨机器三节点集群部署 手工加入节点

三台服务器组成一个集群，ip分别为 10.100.46.6 10.100.46.7 10.100.46.10 。

启动顺序为 10.100.46.10 =》 10.100.46.6 =》10.100.46.7

主节点 docker-compose文件

10.100.46.10的docker-compose.yml

version: '2'
services:
  etcd:
    container_name: etcd-offline-10
    image: registry.cn-hangzhou.aliyuncs.com/coreos_etcd/etcd:v3
    network_mode: "host"
    ports:
      - "2379:2379"
      - "2380:2380"
    environment:
      - TZ=CST-8
      - LANG=zh_CN.UTF-8
    command:
      /usr/local/bin/etcd
      -name etcd-offline-10
      -data-dir /etcd-data
      -advertise-client-urls http://10.100.46.10:2379
      -listen-client-urls http://10.100.46.10:2379,http://127.0.0.1:2379
      -initial-advertise-peer-urls http://10.100.46.10:2380
      -listen-peer-urls http://10.100.46.10:2380
      -initial-cluster-token xingchen
      -initial-cluster-state new
    volumes:
      - "/data/etcd/data:/etcd-data"

使用命令 docker-compose up后启动

然后使用本地的 etcdctl进行添加节点的操作（注意：要向集群添加节点再启动节点）

46.10的操作记录

[root@localhost etcd]# ./etcdctl member add etcd-offline-6 http://10.100.46.6:2380
Added member named etcd-offline-6 with ID 3bf8c1715d31b529 to cluster
 
ETCD_NAME="etcd-offline-6"
ETCD_INITIAL_CLUSTER="etcd-offline-6=http://10.100.46.6:2380,etcd-offline-10=http://10.100.46.10:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"

然后根据提示在46.6上修改docker-compose文件 增加 -name etcd-offline-6 -initial-cluster etcd-offline-6=http://10.100.46.6:2380,etcd-offline-10=http://10.100.46.10:2380 -initial-cluster-state existing
10.100.46.6 上的docker-compose.yml

version: '2'
services:
  etcd:
    container_name: etcd-offline-6
    image: registry.cn-hangzhou.aliyuncs.com/coreos_etcd/etcd:v3
    network_mode: "host"
    ports:
      - "2379:2379"
      - "2380:2380"
    environment:
      - TZ=CST-8
      - LANG=zh_CN.UTF-8
    command:
      /usr/local/bin/etcd
      -name etcd-offline-6
      -data-dir /etcd-data
      -advertise-client-urls http://10.100.46.6:2379
      -listen-client-urls http://10.100.46.6:2379,http://127.0.0.1:2379
      -initial-advertise-peer-urls http://10.100.46.6:2380
      -listen-peer-urls http://10.100.46.6:2380
      -initial-cluster-token xingchen
      -initial-cluster etcd-offline-6=http://10.100.46.6:2380,etcd-offline-10=http://10.100.46.10:2380
      -initial-cluster-state existing
    volumes:
      - "/data/etcd/data:/etcd-data"

然后运行docker-compose up 启动节点 在46.10上查看集群状态 etcdctl member list

节点状态

[root@localhost etcd]# ./etcdctl --endpoint http://10.100.46.6:2379 member list
3bf8c1715d31b529: name=etcd-offline-6 peerURLs=http://10.100.46.6:2380 clientURLs=http://10.100.46.6:2379 isLeader=false
51430d988a335e3c: name=etcd-offline-10 peerURLs=http://10.100.46.10:2380 clientURLs=http://10.100.46.10:2379 isLeader=true

可以看到集群中有两个节点了 然后在增加46.7进入集群

增加46.7

[root@localhost etcd]# ./etcdctl member add etcd-offline-7 http://10.100.46.7:2380
Added member named etcd-offline-7 with ID f61051e7f96e81f2 to cluster
 
ETCD_NAME="etcd-offline-7"
ETCD_INITIAL_CLUSTER="etcd-offline-6=http://10.100.46.6:2380,etcd-offline-10=http://10.100.46.10:2380,etcd-offline-7=http://10.100.46.7:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"

在46.7上修改配置，启动docker容器 docker-compose up

version: '2'
services:
  etcd:
    container_name: etcd-offline-7
    image: registry.cn-hangzhou.aliyuncs.com/coreos_etcd/etcd:v3
    network_mode: "host"
    ports:
      - "2379:2379"
      - "2380:2380"
    environment:
      - TZ=CST-8
      - LANG=zh_CN.UTF-8
    command:
      /usr/local/bin/etcd
      -name etcd-offline-7
      -data-dir /etcd-data
      -advertise-client-urls http://10.100.46.7:2379
      -listen-client-urls http://10.100.46.7:2379,http://127.0.0.1:2379
      -initial-advertise-peer-urls http://10.100.46.7:2380
      -listen-peer-urls http://10.100.46.7:2380
      -initial-cluster-token xingchen
      -initial-cluster etcd-offline-6=http://10.100.46.6:2380,etcd-offline-7=http://10.100.46.7:2380,etcd-offline-10=http://10.100.46.10:2380
      -initial-cluster-state existing
    volumes:
      - "/data/etcd/data:/etcd-data"

在46.10上查看新的集群状态发现已经是三节点了。

三节点状态

[root@localhost etcd]# ./etcdctl --endpoint http://10.100.46.6:2379 member list
3bf8c1715d31b529: name=etcd-offline-6 peerURLs=http://10.100.46.6:2380 clientURLs=http://10.100.46.6:2379 isLeader=false
51430d988a335e3c: name=etcd-offline-10 peerURLs=http://10.100.46.10:2380 clientURLs=http://10.100.46.10:2379 isLeader=true
f61051e7f96e81f2: name=etcd-offline-7 peerURLs=http://10.100.46.7:2380 clientURLs=http://10.100.46.7:2379 isLeader=false

在一开始单节点时写入的数据会自动同步到整个集群！

搞定！