docker-compose搭建etcd集群的实现(三节点）

1. 环境说明

2. 部署

etcd1

ymal文件

version: "3.0"
services:
  etcd1:
    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/etcd

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

[root@liubei-01 etcd1]# docker-compose up -d

查看结果

[root@liubei-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

version: "3.0"
services:
  etcd1:
    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）

启动服务（同上）

etcd3

ymal文件

version: "3.0"
services:
  etcd1:
    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

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

I have no name!@555187fb758c:/opt/bitnami/etcd$ etcdctl --write-out=table  endpoint status
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|    ENDPOINT    |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 127.0.0.1:2379 | 57d6f74aaa8d5d3e |   3.5.4 |   20 kB |      true |      false |         2 |         10 |                 10 |        |
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

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

[root@liubei-01 etcd3]# docker exec -it 788 bash
I have no name!@788dd01aaa79:/opt/bitnami/etcd$ etcd
etcd     etcdctl
I have no name!@788dd01aaa79:/opt/bitnami/etcd$ etcdctl put name "liubei"
OK

登录另一个节点，进入容器，读取数据

[root@liubei-02 ~]# docker exec -it 555 bash
I have no name!@555187fb758c:/opt/bitnami/etcd$ etcdctl get name
name
liubei

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