doccker-compose运维etcd集群。
1、单实例etcd集群
doccker-compose管理的单实例etcd集群，支持数据持久化，支持公网访问，支持开机启动
配置文件docker-compose.yml:
services:
etcd-1:
image: quay.io/coreos/etcd:v3.5.7
entrypoint: /usr/local/bin/etcd
command:
- '--name=etcd-1'
- '--initial-advertise-peer-urls=http://etcd-1:2380'
- '--listen-peer-urls=http://0.0.0.0:2380'
- '--listen-client-urls=http://0.0.0.0:2379'
- '--advertise-client-urls=http://etcd-1:2379'
- '--heartbeat-interval=250'
- '--election-timeout=1250'
- '--data-dir=/etcd-data'
- '--initial-cluster=etcd-1=http://etcd-1:2380'
- '--initial-cluster-state=new'
- '--initial-cluster-token=mys3cr3ttok3n'
restart: always
ports:
- "12379:2379"
volumes:
- ./data/etcd1:/etcd-data:rw
networks:
- bridge-network
networks:
bridge-network:
driver: bridge
enable_ipv6: false
说明：
- 使用官方镜像：quay.io/coreos/etcd:v3.5.7
- 使用bind volume，即映射宿主机目录
./data/etcd1到容器目录/etcd-data，配合--data-dir=/etcd-data让etcd使用 - 禁用IPv6网络
enable_ipv6: false，以便重启时不会报port已被占用错误 - 支持开机启动
restart: always - 端口映射
"12379:2379"将宿主机端口12379映射到容器2379端口，给公网访问使用
实际使用：
## 在nuc上运行
# 启动etcd cluster
nuc$ docker-compose up -d
Creating network "etcd-single-node_bridge-network" with driver "bridge"
Creating etcd-single-node_etcd-1_1 ... done
# 查看容器状态
nuc$ docker-compose ps
Name Command State Ports
------------------------------------------------------------------------------------------------------
etcd-single-node_etcd-1_1 /usr/local/bin/etcd --name ... Up 0.0.0.0:12379->2379/tcp, 2380/tcp
# 查看data目录树，etcd已经初始化好了数据目录
nuc$ tree
.
├── README.md
├── data
│ └── etcd1
│ └── member
│ ├── snap
│ │ └── db
│ └── wal
│ ├── 0.tmp
│ └── 0000000000000000-0000000000000000.wal
└── docker-compose.yml
5 directories, 5 files
## 下面是在
# 集群只有一个etcd节点
mac$ etcdctl --endpoints=$NUC:12379 -w=table member list
+------------------+---------+--------+--------------------+--------------------+------------+
| ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER |
+------------------+---------+--------+--------------------+--------------------+------------+
| b8c6addf901e4e46 | started | etcd-1 | http://etcd-1:2380 | http://etcd-1:2379 | false |
+------------------+---------+--------+--------------------+--------------------+------------+
# 数据读写
mac$ etcdctl --endpoints=$NUC:12379 put secret gongpengjun
OK
mac$ etcdctl --endpoints=$NUC:12379 get secret
secret
gongpengjun
2、三实例etcd集群
doccker-compose管理的3实例etcd集群，支持数据持久化，支持公网访问
配置文件docker-compose.yml:
x-variables:
flag_initial_cluster_token: &flag_initial_cluster_token '--initial-cluster-token=mys3cr3ttok3n'
common_settings: &common_settings
image: quay.io/coreos/etcd:v3.5.7
entrypoint: /usr/local/bin/etcd
ports:
- 2379
services:
etcd-1:
<<: *common_settings
command:
- '--name=etcd-1'
- '--initial-advertise-peer-urls=http://etcd-1:2380'
- '--listen-peer-urls=http://0.0.0.0:2380'
- '--listen-client-urls=http://0.0.0.0:2379'
- '--advertise-client-urls=http://etcd-1:2379'
- '--heartbeat-interval=250'
- '--election-timeout=1250'
- '--data-dir=/etcd-data'
- '--initial-cluster=etcd-1=http://etcd-1:2380,etcd-2=http://etcd-2:2380,etcd-3=http://etcd-3:2380'
- '--initial-cluster-state=new'
- *flag_initial_cluster_token
ports:
- "12379:2379"
- "12380:2380"
volumes:
- ./data/etcd1:/etcd-data:rw
networks:
- bridge-network
etcd-2:
<<: *common_settings
command:
- '--name=etcd-2'
- '--initial-advertise-peer-urls=http://etcd-2:2380'
- '--listen-peer-urls=http://0.0.0.0:2380'
- '--listen-client-urls=http://0.0.0.0:2379'
- '--advertise-client-urls=http://etcd-2:2379'
- '--heartbeat-interval=250'
- '--election-timeout=1250'
- '--data-dir=/etcd-data'
- '--initial-cluster=etcd-1=http://etcd-1:2380,etcd-2=http://etcd-2:2380,etcd-3=http://etcd-3:2380'
- '--initial-cluster-state=new'
- *flag_initial_cluster_token
ports:
- "22379:2379"
- "22380:2380"
volumes:
- ./data/etcd2:/etcd-data:rw
networks:
- bridge-network
etcd-3:
<<: *common_settings
command:
- '--name=etcd-3'
- '--initial-advertise-peer-urls=http://etcd-3:2380'
- '--listen-peer-urls=http://0.0.0.0:2380'
- '--listen-client-urls=http://0.0.0.0:2379'
- '--advertise-client-urls=http://etcd-3:2379'
- '--heartbeat-interval=250'
- '--election-timeout=1250'
- '--data-dir=/etcd-data'
- '--initial-cluster=etcd-1=http://etcd-1:2380,etcd-2=http://etcd-2:2380,etcd-3=http://etcd-3:2380'
- '--initial-cluster-state=new'
- *flag_initial_cluster_token
ports:
- "32379:2379"
- "32380:2380"
volumes:
- ./data/etcd3:/etcd-data:rw
networks:
- bridge-network
networks:
bridge-network:
driver: bridge
enable_ipv6: false
实际使用：
$ docker-compose up -d
Creating network "etcd-cluster_default" with the default driver
Creating etcd-cluster_etcd-3_1 ... done
Creating etcd-cluster_etcd-2_1 ... done
Creating etcd-cluster_etcd-1_1 ... done
$ docker-compose ps
Name Command State Ports
--------------------------------------------------------------------------------------------------
etcd-cluster_etcd-1_1 /usr/local/bin/etcd --name ... Up 0.0.0.0:32773->2379/tcp, 2380/tcp
etcd-cluster_etcd-2_1 /usr/local/bin/etcd --name ... Up 0.0.0.0:32771->2379/tcp, 2380/tcp
etcd-cluster_etcd-3_1 /usr/local/bin/etcd --name ... Up 0.0.0.0:32772->2379/tcp, 2380/tcp
$ docker exec -it etcd-cluster_etcd-1_1 etcdctl --write-out=table member list
+------------------+---------+--------+--------------------+--------------------+------------+
| ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER |
+------------------+---------+--------+--------------------+--------------------+------------+
| 88d11e2649dad027 | started | etcd-2 | http://etcd-2:2380 | http://etcd-2:2379 | false |
| b8c6addf901e4e46 | started | etcd-1 | http://etcd-1:2380 | http://etcd-1:2379 | false |
| c3697a4fd7a20dcd | started | etcd-3 | http://etcd-3:2380 | http://etcd-3:2379 | false |
+------------------+---------+--------+--------------------+--------------------+------------+
