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docker部署etcd集群
etcd版本:v3.5.5
创建etcd数据目录
mkdir -p etcd-node{1,2,3}
创建docker网络
docker network create --driver bridge --subnet 172.20.0.0/16 --gateway 172.20.0.1 etcd-cluster
docker-compose.yml
version: '3'
networks:
etcd-cluster:
external: true
services:
etcd-node1:
image: quay.io/coreos/etcd:v3.5.5
container_name: etcd-node1
ports:
- "12379:2379"
- "12380:2380"
restart: always
volumes:
- ./etcd-node1:/data/app/etcd
command: etcd --name etcd-node1 --data-dir /data/app/etcd/ --advertise-client-urls http://172.20.0.10:2379 --initial-advertise-peer-urls http://172.20.0.10:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.20.0.10:2380,etcd-node2=http://172.20.0.11:2380,etcd-node3=http://172.20.0.12:2380" --initial-cluster-state new
networks:
etcd-cluster:
ipv4_address: 172.20.0.10
etcd-node2:
image: quay.io/coreos/etcd:v3.5.5
container_name: etcd-node2
ports:
- "22379:2379"
- "22380:2380"
restart: always
volumes:
- ./etcd-node2:/data/app/etcd
command: etcd --name etcd-node2 --data-dir /data/app/etcd/ --advertise-client-urls http://172.20.0.11:2379 --initial-advertise-peer-urls http://172.20.0.11:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.20.0.10:2380,etcd-node2=http://172.20.0.11:2380,etcd-node3=http://172.20.0.12:2380" --initial-cluster-state new
networks:
etcd-cluster:
ipv4_address: 172.20.0.11
etcd-node3:
image: quay.io/coreos/etcd:v3.5.5
container_name: etcd-node3
ports:
- "32379:2379"
- "32380:2380"
restart: always
volumes:
- ./etcd-node3:/data/app/etcd
command: etcd --name etcd-node3 --data-dir /data/app/etcd/ --advertise-client-urls http://172.20.0.12:2379 --initial-advertise-peer-urls http://172.20.0.12:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.20.0.10:2380,etcd-node2=http://172.20.0.11:2380,etcd-node3=http://172.20.0.12:2380" --initial-cluster-state new
networks:
etcd-cluster:
ipv4_address: 172.20.0.12
启动集群
docker-compose up -d
验证集群
docker exec -it etcd-node1 bash
etcdctl member list -w table
etcdctl --endpoints=172.20.0.10:2379,172.20.0.11:2379,172.20.0.12:2379 endpoint status -w table
可以看出etcd-node2为leader。
读写数据
etcdctl put /foo bar
etcdctl get /foo
任意节点写入，任意节点都可以读取。
节点故障测试1
停掉etcd-node1节点(非leader)。进行读写测试。
恢复etcd-node1节点。进行读写测试。
节点故障测试2
停掉etcd-node2节点(leader)。观察新leader。进行读写测试。
恢复etcd-node2节点。进行读写测试。
添加节点
etcd4.yml
创建数据目录
mkdir etcd-node4
version: '3'
networks:
etcd-cluster:
external: true
services:
etcd-node4:
image: quay.io/coreos/etcd:v3.5.5
container_name: etcd-node4
ports:
- "42379:2379"
- "42380:2380"
restart: always
volumes:
- ./etcd-node4:/data/app/etcd
command: etcd --name etcd-node4 --data-dir /data/app/etcd/ --advertise-client-urls http://172.20.0.13:2379 --initial-advertise-peer-urls http://172.20.0.13:2380 --listen-client-urls http://0.0.0.0:2379 --listen-peer-urls http://0.0.0.0:2380 --initial-cluster-token etcd-cluster --initial-cluster "etcd-node1=http://172.20.0.10:2380,etcd-node2=http://172.20.0.11:2380,etcd-node3=http://172.20.0.12:2380,etcd-node4=http://172.20.0.13:2380" --initial-cluster-state existing
networks:
etcd-cluster:
ipv4_address: 172.20.0.13
启动：
docker-compose -f etcd4.yml up -d
进入任意容器执行:
etcdctl member add etcd-node4 --peer-urls=http://172.20.0.13:2380
重启容器:
docker-compose -f etcd4.yml stop
docker-compose -f etcd4.yml start
验证集群。
删除节点
etcdctl member remove b7476e957868d2df
Member b7476e957868d2df removed from cluster fcb94ddca70b9db2
etcdctl member list -w table
etcdctl --endpoints=172.20.0.10:2379,172.20.0.11:2379,172.20.0.12:2379 endpoint status -w table
