docker-compose搭建etcd集群的实现(三节点）
目录
2. 部署
etcd1
1. 环境说明
2. 部署
etcd1
etcd2
etcd3
3. 验证
3.1 查看集群状态
3.2 读写测试
1. 环境说明| etcd1 | 10.10.239.31 |
| etcd2 | 10.10.239.32 |
| etcd3 | 10.10.239.33 |
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）
etcd3ymal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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