docker-compose搭建etcd集群的實現(xiàn)(三節(jié)點）

更新時間：2022年07月05日 16:36:37 作者：開發(fā)運維玄德公

本文主要介紹了docker-compose搭建etcd集群的實現(xiàn)(三節(jié)點),文中通過示例代碼介紹的非常詳細，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

1. 環(huán)境說明

節(jié)點	IP
etcd1	10.10.239.31
etcd2	10.10.239.32
etcd3	10.10.239.33

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 #示例中我們不設(shè)置密碼
      - ETCD_NAME=etcd1 #節(jié)點自己的名字
      - ETCD_ADVERTISE_CLIENT_URLS=http://10.10.239.31:2379  #告知集群自己的客戶端地址
      - ETCD_LISTEN_CLIENT_URLS=http://0.0.0.0:2379 #設(shè)置監(jiān)聽客戶端通訊的URL列表
      - ETCD_INITIAL_ADVERTISE_PEER_URLS=http://10.10.239.31:2380 #告知集群自己集群通訊地址
      - ETCD_LISTEN_PEER_URLS=http://0.0.0.0:2380 #用于監(jiān)聽伙伴通訊的URL列表
      - ETCD_INITIAL_CLUSTER_TOKEN=etcd-cluster #etcd 集群的初始化集群記號
      - ETCD_INITIAL_CLUSTER=etcd1=http://10.10.239.31:2380,etcd2=http://10.10.239.32:2380,etcd3=http://10.10.239.33:2380 #集群成員
      - ETCD_INITIAL_CLUSTER_STATE=new #初始化集群狀態(tài)
    volumes:
      - ./data:/bitnami/etcd

持久化

如果此時啟動，會在當(dāng)前目錄下創(chuàng)建 ./data 目錄，掛載到容器的 /bitnami/etcd ，但我們要注意的是，容器中啟動etcd的用戶并不是root用戶，很可能沒有在目錄下創(chuàng)建文件的權(quán)限。我們有兩個方案：

【方法一】給777權(quán)限（不建議）

【方法二】所屬主改成對應(yīng)宿主機用戶（建議）

方法二操作：

先給./data目錄777權(quán)限
查看新生成的文件屬主是宿主機哪個用戶，就將./data目錄屬主改為哪個用戶
再將權(quán)限改回755或750，重啟容器

啟動服務(wù)

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

查看結(jié)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）

啟動服務(wù)（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）

啟動服務(wù)（同上）

3. 驗證

3.1 查看集群狀態(tài)

查看集群成員

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 |
+------------------+---------+-------+--------------------------+--------------------------+------------+

查看本節(jié)點狀態(tài)

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 |        |
+----------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

查看本節(jié)點健康狀態(tài)

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 讀寫測試

登錄其中一個節(jié)點，進入容器，寫一條數(shù)據(jù)
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

登錄另一個節(jié)點，進入容器，讀取數(shù)據(jù)

[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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