Docker 搭建 etcd 集群及管理
环境
host1 10.1.99.13
host2 10.1.99.14
host3 10.1.99.15
host4 10.1.99.12（用于测试添加删除节点）
初始化集群
host1
$ docker run --restart always -d -v /usr/share/ca-certificates/:/etc/ssl/certs -p 4001:4001 -p 2380:2380 -p 2379:2379 \ --name etcd quay.io/coreos/etcd \ etcd \ --name etcd0 \ --advertise-client-urls http://10.1.99.13:2379,http://10.1.99.13:4001 \ --listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001 \ --initial-advertise-peer-urls http://10.1.99.13:2380 \ --listen-peer-urls http://0.0.0.0:2380 \ --initial-cluster-token etcd-cluster-1 \ --initial-cluster etcd0=http://10.1.99.13:2380,etcd1=http://10.1.99.14:2380,etcd2=http://10.1.99.15:2380 \ --initial-cluster-state new
host2
$ docker run --restart always -d -v /usr/share/ca-certificates/:/etc/ssl/certs -p 4001:4001 -p 2380:2380 -p 2379:2379 \ --name etcd quay.io/coreos/etcd \ etcd \ --name etcd1 \ --advertise-client-urls http://10.1.99.14:2379,http://10.1.99.14:4001 \ --listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001 \ --initial-advertise-peer-urls http://10.1.99.14:2380 \ --listen-peer-urls http://0.0.0.0:2380 \ --initial-cluster-token etcd-cluster-1 \ --initial-cluster etcd0=http://10.1.99.13:2380,etcd1=http://10.1.99.14:2380,etcd2=http://10.1.99.15:2380 \ --initial-cluster-state new
host3
$ docker run --restart always -d -v /usr/share/ca-certificates/:/etc/ssl/certs -p 4001:4001 -p 2380:2380 -p 2379:2379 \ --name etcd quay.io/coreos/etcd \ etcd \ -name etcd2 \ --advertise-client-urls http://10.1.99.15:2379,http://10.1.99.15:4001 \ --listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001 \ --initial-advertise-peer-urls http://10.1.99.15:2380 \ --listen-peer-urls http://0.0.0.0:2380 \ --initial-cluster-token etcd-cluster-1 \ --initial-cluster etcd0=http://10.1.99.13:2380,etcd1=http://10.1.99.14:2380,etcd2=http://10.1.99.15:2380 \ --initial-cluster-state new
验证
#选择任意一个节点 进入 etcd shell $ docker exec -it etcd bin/sh # 查看节点状态 $ etcdctl member list 52a25183c1fa5a39: name=etcd0 peerURLs=http://10.1.99.13:2380 clientURLs=http://10.1.99.13:2379,http://10.1.99.13:4001 isLeader=false 69aa775a244f2954: name=etcd1 peerURLs=http://10.1.99.14:2380 clientURLs=http://10.1.99.14:2379,http://10.1.99.14:4001 isLeader=true f18991cb367747f3: name=etcd2 peerURLs=http://10.1.99.15:2380 clientURLs=http://10.1.99.15:2379,http://10.1.99.15:4001 isLeader=false #查看集群状态 etcdctl cluster-health member 52a25183c1fa5a39 is healthy: got healthy result from http://10.1.99.13:2379 member 69aa775a244f2954 is healthy: got healthy result from http://10.1.99.14:2379 member f18991cb367747f3 is healthy: got healthy result from http://10.1.99.15:2379 cluster is healthy #插入一条记录 $ etcdctl set /home/etcdtest value value #读取插入记录 在其他节点执行获取到相同结果 $ etcdctl get /home/etcdtest value
集群管理在集群中加入一个节点
#在现有的集群中执行以下命令 $ etcdctl member add etcd3 http://10.1.99.12:2380 Added member named etcd3 with ID 7b33d7070ed90c25 to cluster ETCD_NAME="etcd3" ETCD_INITIAL_CLUSTER="etcd0=http://10.1.99.13:2380,etcd1=http://10.1.99.14:2380,etcd3=http://10.1.99.12:2380,etcd2=http://10.1.99.15:2380" ETCD_INITIAL_CLUSTER_STATE="existing" #在对应的待加入的节点上 $ docker run --restart always -d -v /usr/share/ca-certificates/:/etc/ssl/certs -p 4001:4001 -p 2380:2380 -p 2379:2379 \ --name etcd quay.io/coreos/etcd \ etcd \ --name etcd3 \ --advertise-client-urls http://10.1.99.12:2379,http://10.1.99.12:4001 \ --listen-client-urls http://0.0.0.0:2379,http://0.0.0.0:4001 \ --initial-advertise-peer-urls http://10.1.99.12:2380 \ --listen-peer-urls http://0.0.0.0:2380 \ --initial-cluster-token etcd-cluster-1 \ --initial-cluster etcd0=http://10.1.99.13:2380,etcd1=http://10.1.99.14:2380,etcd3=http://10.1.99.12:2380,etcd2=http://10.1.99.15:2380 \ --initial-cluster-state existing 注意事项： 1 使用上面生成的配置内容分别修改对应的属性 2 设置 --initial-cluster-state existing 删除节点， #在现有的集群中执行以下命令 #显示当前集群中的所用节点信息 $ etcdctl member list 52a25183c1fa5a39: name=etcd0 peerURLs=http://10.1.99.13:2380 clientURLs=http://10.1.99.13:2379,http://10.1.99.13:4001 isLeader=false 69aa775a244f2954: name=etcd1 peerURLs=http://10.1.99.14:2380 clientURLs=http://10.1.99.14:2379,http://10.1.99.14:4001 isLeader=true 7b33d7070ed90c25: name=etcd3 peerURLs=http://10.1.99.12:2380 clientURLs=http://10.1.99.12:2379,http://10.1.99.12:4001 isLeader=false f18991cb367747f3: name=etcd2 peerURLs=http://10.1.99.15:2380 clientURLs=http://10.1.99.15:2379,http://10.1.99.15:4001 isLeader=false #在集群中剔除待删除节点 $ etcdctl member remove 7b33d7070ed90c25
