docker-compose部署etcd集群的实现步骤
目录
- 编写docker-compose.yml
- 运行docker-compose
- 检查搭建状态
- 测试节点
- Golang 与 etcd 简单交互
编写docker-compose.yml
version: “3.0”
networks:
etcd-net: # 网络
driver: bridge # 桥接模式
volumes:
etcd1_data: # 挂载到本地的数据卷名
driver: local
etcd2_data:
driver: local
etcd3_data:
driver: local
###
### etcd 其他环境配置见：https://doczhcn.gitbook.io/etcd/index/index-1/configuration
###
services:
etcd1:
image: bitnami/etcd:latest # 镜像
container_name: etcd1 # 容器名 –name
restart: always # 总是重启
networks:
– etcd-net # 使用的网络 –network
ports: # 端口映射 -p
– “20000:2379”
– “20001:2380”
environment: # 环境变量 –env
– ALLOW_NONE_AUTHENTICATION=yes # 允许不用密码登录
– ETCD_NAME=etcd1 # etcd 的名字
– ETCD_INITIAL_ADVERTISE_PEER_URLS=http://etcd1:2380 # 列出这个成员的伙伴 URL 以便通告给集群的其他成员
– ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380 # 用于监听伙伴通讯的URL列表
– ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379 # 用于监听客户端通讯的URL列表
– ETCD_ADVERTISE_CLIENT_URLS=http://etcd1:2379 # 列出这个成员的客户端URL，通告给集群中的其他成员
– ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster # 在启动期间用于 etcd 集群的初始化集群记号
– ETCD_INITIAL_CLUSTER=etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380 # 为启动初始化集群配置
– ETCD_INITIAL_CLUSTER_STATE=new # 初始化集群状态
volumes:
– etcd1_data:/bitnami/etcd # 挂载的数据卷
etcd2:
image: bitnami/etcd:latest
container_name: etcd2
restart: always
networks:
– etcd-net
ports:
– “20002:2379”
– “20003:2380”
environment:
– ALLOW_NONE_AUTHENTICATION=yes
– ETCD_NAME=etcd2
– ETCD_INITIAL_ADVERTISE_PEER_URLS=http://etcd2:2380
– ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380
– ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379
– ETCD_ADVERTISE_CLIENT_URLS=http://etcd2:2379
– ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster
– ETCD_INITIAL_CLUSTER=etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380
– ETCD_INITIAL_CLUSTER_STATE=new
volumes:
– etcd2_data:/bitnami/etcd
etcd3:
image: bitnami/etcd:latest
container_name: etcd3
restart: always
networks:
– etcd-net
ports:
– “20004:2379”
– “20005:2380”
environment:
– ALLOW_NONE_AUTHENTICATION=yes
– ETCD_NAME=etcd3
– ETCD_INITIAL_ADVERTISE_PEER_URLS=http://etcd3:2380
– ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380
– ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379
– ETCD_ADVERTISE_CLIENT_URLS=http://etcd3:2379
– ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster
– ETCD_INITIAL_CLUSTER=etcd1=http://etcd1:2380,etcd2=http://etcd2:2380,etcd3=http://etcd3:2380
– ETCD_INITIAL_CLUSTER_STATE=new
volumes:
– etcd3_data:/bitnami/etcd
运行docker-compose
[root@centos8 etcdtest]# tree
.
└── docker-compose.yml
0 directories, 1 file
[root@centos8 etcdtest]# docker-compose up -d
[+] Running 4/4
⠿ Network etcdtest_etcd-net Created 0.1s
⠿ Container etcd3 Started 0.6s
⠿ Container etcd1 Started 0.7s
⠿ Container etcd2 Started 0.7s
[root@centos8 etcdtest]#
检查搭建状态
查看节点启动情况
[root@centos8 etcdtest]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
89469f98491f bitnami/etcd:latest “/opt/bitnami/script…” 54 seconds ago Up 53 seconds 0.0.0.0:20004->2379/tcp, :::20004->2379/tcp, 0.0.0.0:20005->2380/tcp, :::20005->2380/tcp etcd3
5454f5a719a2 bitnami/etcd:latest “/opt/bitnami/script…” 54 seconds ago Up 53 seconds 0.0.0.0:20000->2379/tcp, :::20000->2379/tcp, 0.0.0.0:20001->2380/tcp, :::20001->2380/tcp etcd1
bf989f9512b5 bitnami/etcd:latest “/opt/bitnami/script…” 54 seconds ago Up 53 seconds 0.0.0.0:20002->2379/tcp, :::20002->2379/tcp, 0.0.0.0:20003->2380/tcp, :::20003->2380/tcp etcd2
查看挂载的数据卷
[root@centos8 etcdtest]# docker volume ls
DRIVER VOLUME NAME
local etcdtest_etcd1_data
local etcdtest_etcd2_data
local etcdtest_etcd3_data
[root@centos8 etcdtest]# docker inspect etcd1
“Mounts”: [
{
“Type”: “volume”,
“Name”: “etcdtest_etcd1_data”,
“Source”: “/var/lib/docker/volumes/etcdtest_etcd1_data/_data”,
“Destination”: “/bitnami/etcd”,
“Driver”: “local”,
“Mode”: “z”,
“RW”: true,
“Propagation”: “”
}
]
测试节点
从etcd1写一个key
[root@centos8 etcdtest]# docker exec -it etcd1 bash
I have no name!@5454f5a719a2:/opt/bitnami/etcd$ etcdctl put name “i am wxf”
OK
从etcd2读一个value
[wxf@centos8 ~]$ docker exec -it etcd2 bash
I have no name!@bf989f9512b5:/opt/bitnami/etcd$ etcdctl get name
name
i am wxf
搭建成功！
Golang 与 etcd 简单交互
package main
import (
“context”
“fmt”
“go.etcd.io/etcd/client/v3”
“time”
)
func main() {
cli, err := clientv3.New(clientv3.Config{
Endpoints: []string{“http://192.168.135.10:20000”, “http://192.168.135.10:20002”, “http://192.168.135.10:20004”},
DialTimeout: 5 * time.Second,
})
if err != nil {
fmt.Printf(“connect to etcd failed, err:%v\n”, err)
return
}
defer cli.Close()
fmt.Println(“connect to etcd success”)
defer cli.Close()
go Watch(cli)
Create(cli)
Read(cli)
Delete(cli)
Update(cli)
select {}
}
func Watch(cli *clientv3.Client) {
rch := cli.Watch(context.Background(), “name”) // type WatchChan <-chan WatchResponse
for wresp := range rch {
for _, ev := range wresp.Events {
fmt.Printf(“Type: %s Key:%s Value:%s\n”, ev.Type, ev.Kv.Key, ev.Kv.Value)
}
}
fmt.Println(“out”)
}
func Create(cli *clientv3.Client) {
// put
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
_, err := cli.Put(ctx, “name”, “wxf”)
cancel()
if err != nil {
fmt.Printf(“put to etcd failed, err:%v\n”, err)
return
}
}
func Read(cli *clientv3.Client) {
//get
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
resp, err := cli.Get(ctx, “name”)
cancel()
if err != nil {
fmt.Printf(“get from etcd failed, err:%v\n”, err)
return
}
for _, ev := range resp.Kvs {
fmt.Printf(“Type: %s Key:%s Value:%s\n”, “READ”, ev.Key, ev.Value)
}
}
func Update(cli *clientv3.Client) {
// put
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
_, err := cli.Put(ctx, “name”, “xyy”)
cancel()
if err != nil {
fmt.Printf(“put to etcd failed, err:%v\n”, err)
return
}
}
func Delete(cli *clientv3.Client) {
//del
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
_, err := cli.Delete(ctx, “name”)
cancel()
if err != nil {
fmt.Printf(“delete from etcd failed, err:%v\n”, err)
return
}
}
go run main.go
connect to etcd success
Type: PUT Key:name Value:wxf
Type: READ Key:name Value:wxf
Type: DELETE Key:name Value:
Type: PUT Key:name Value:xyy
Type: PUT Key:name Value:test for terminal
Type: PUT Key:name Value:test for terminal aabbccdd
I have no name!@5454f5a719a2:/opt/bitnami/etcd$ etcdctl put name “test for terminal”
OK
I have no name!@5454f5a719a2:/opt/bitnami/etcd$ etcdctl put name “test for terminal aabbccdd”
OK
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