# Docker-多节点Etcd部署 ### 1. 环境说明 | 节点 | IP | | ----- | ------------ | | etcd1 | 10.10.239.31 | | etcd2 | 10.10.239.32 | | etcd3 | 10.10.239.33 | ### 2. 部署 #### etcd1 ymal文件 ```yaml version: "3.0" services: etcd: image: bitnami/etcd:latest container_name: etcd1 restart: always ports: - "2379:2379" - "2380:2380" environment: - ALLOW_NONE_AUTHENTICATION=yes #示例中我们不设置密码 - ETCD_NAME=etcd1 #节点自己的名字 - ETCD_ADVERTISE_CLIENT_URLS=http://10.10.239.31:2379 #告知集群自己的客户端地址 - ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379 #设置监听客户端通讯的URL列表 - ETCD_INITIAL_ADVERTISE_PEER_URLS=http://10.10.239.31:2380 #告知集群自己集群通讯地址 - ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380 #用于监听伙伴通讯的URL列表 - ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster #etcd 集群的初始化集群记号 - ETCD_INITIAL_CLUSTER=etcd1=http://10.10.239.31:2380,etcd2=http://10.10.239.32:2380,etcd3=http://10.10.239.33:2380 #集群成员 - ETCD_INITIAL_CLUSTER_STATE=new #初始化集群状态 volumes: - ./data:/bitnami/etc ``` 持久化 如果此时启动，会在当前目录下创建 ./data 目录，挂载到容器的 /bitnami/etcd ，但我们要注意的是，容器中启动etcd的用户并不是root用户，很可能没有在目录下创建文件的权限。我们有两个方案： 【方法一】给777权限（不建议） 【方法二】所属主改成对应宿主机用户（建议） 方法二操作： * 先给./data目录777权限 * 查看新生成的文件属主是宿主机哪个用户，就将./data目录属主改为哪个用户 * 再将权限改回755或750，重启容器 启动服务 ```bash [root@centos-01 etcd1]# docker-compose up -d ``` 查看结果 ```bash [root@centos-01 etcd1]# docker-compose ps Name Command State Ports ----------------------------------------------------------------------------------------------- etcd1 /opt/bitnami/scripts/etcd/ ... Up 0.0.0.0:2379->2379/tcp, 0.0.0.0:2380->2380/tcp ``` ### etcd2 ymal文件 ```yaml version: "3.0" services: etcd: image: bitnami/etcd:latest container_name: etcd2 restart: always ports: - "2379:2379" - "2380:2380" environment: - ALLOW_NONE_AUTHENTICATION=yes - ETCD_NAME=etcd2 - ETCD_ADVERTISE_CLIENT_URLS=http://10.10.239.32:2379 - ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379 - ETCD_INITIAL_ADVERTISE_PEER_URLS=http://10.10.239.32:2380 - ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380 - ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster - ETCD_INITIAL_CLUSTER=etcd1=http://10.10.239.31:2380,etcd2=http://10.10.239.32:2380,etcd3=http://10.10.239.33:2380 - ETCD_INITIAL_CLUSTER_STATE=new volumes: - ./data:/bitnami/etcd ``` 持久化（同上） #### etcd3 启动动服务（同上） yaml文件 ```bash version: "3.0" services: etcd: image: bitnami/etcd:latest container_name: etcd3 restart: always ports: - "2379:2379" - "2380:2380" environment: - ALLOW_NONE_AUTHENTICATION=yes - ETCD_NAME=etcd3 - ETCD_ADVERTISE_CLIENT_URLS=http://10.10.239.33:2379 - ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379 - ETCD_INITIAL_ADVERTISE_PEER_URLS=http://10.10.239.33:2380 - ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380 - ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster - ETCD_INITIAL_CLUSTER=etcd1=http://10.10.239.31:2380,etcd2=http://10.10.239.32:2380,etcd3=http://10.10.239.33:2380 - ETCD_INITIAL_CLUSTER_STATE=new volumes: - ./data:/bitnami/etcd ``` 持久化（同上） 启动服务（同上） ### 3. 验证 #### 3.1 查看集群状态 查看集群成员 ```bash I have no name!@555187fb758c:/opt/bitnami/etcd$ etcdctl --write-out=table member list +------------------+---------+-------+--------------------------+--------------------------+------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | +------------------+---------+-------+--------------------------+--------------------------+------------+ | 57d6f74aaa8d5d3e | started | etcd1 | http://10.10.239.31:2380 | http://10.10.239.31:2379 | false | | 9107e491ab549324 | started | etcd3 | http://10.10.239.33:2380 | http://10.10.239.33:2379 | false | | e7b147006e212ca5 | started | etcd2 | http://10.10.239.32:2380 | http://10.10.239.32:2379 | false | +------------------+---------+-------+--------------------------+--------------------------+------------+ ``` 查看本节点状态 ```bash I have no name!@555187fb758c:/opt/bitnami/etcd$ etcdctl --write-out=table member list +------------------+---------+-------+--------------------------+--------------------------+------------+ | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | +------------------+---------+-------+--------------------------+--------------------------+------------+ | 57d6f74aaa8d5d3e | started | etcd1 | http://10.10.239.31:2380 | http://10.10.239.31:2379 | false | | 9107e491ab549324 | started | etcd3 | http://10.10.239.33:2380 | http://10.10.239.33:2379 | false | | e7b147006e212ca5 | started | etcd2 | http://10.10.239.32:2380 | http://10.10.239.32:2379 | false | +------------------+---------+-------+--------------------------+--------------------------+------------+ ``` 查看本节点健康状态 \`\`\``I have no` `name!@555187fb758c:/opt/bitnami/etcd$ etcdctl --write-out=table endpoint health+----------------+--------+------------+-------+| ENDPOINT | HEALTH | TOOK | ERROR |+----------------+--------+------------+-------+| 127.0.0.1:2379 | true` `| 3.736825ms | |+----------------+--------+------------+-------` ### 3.2 读写测试 登录其中一个节点，进入容器，写一条数据\ zai ```bash [root@centos-01 etcd3]# docker exec -it etcd1 bash I have no name!@788dd01aaa79:/opt/bitnami/etcd$ etcdctl put name "kkk" OK ``` 登录另一个节点，进入容器，读取数据 ```bash [root@centos-01 etcd3]# docker exec -it etcd3 bash I have no name!@788dd01aaa79:/opt/bitnami/etcd$ etcdctl get name name kkk ``` | | | | - | - | --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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