docker-compase搭建mysql主從複製

rambler_kieran發表於2018-05-18

準備工作

  1. 版本說明

    版本如下所示:

    • mysql:5.7.22

    本教程所有工具和資料目錄存放於/docker目錄下

  2. 安裝docker

    詳情見docs.docker.com/install/lin…

  3. 安裝docker-compose

    這裡簡單介紹下兩種安裝docker-compose的方式,第一種方式相對簡單,但是由於網路問題,常常安裝不上,並且經常會斷開,第二種方式略微麻煩,但是安裝過程比較穩定。

    • 方式一

      curl -L https://github.com/docker/compose/releases/download/1.8.1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
      chmod +x /usr/local/bin/docker-compose
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      檢視版本資訊:

      docker-compose --version
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      但是此方法會經常因為網路的原因而無法安裝

    • 方式二

      安裝python-pip

        ```
        yum -y install epel-release
        yum -y install python-pip
        ```
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      安裝docker-compose

        ```
        pip install docker-compose
        ```
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      待安裝完成後,執行查詢版本的命令,即可安裝docker-compose

    • 安裝完成如下所示:

      [root@VM_0_14_redhat ~]# docker-compose version
      docker-compose version 1.21.0, build 5920eb0
      docker-py version: 3.2.1
      CPython version: 2.7.5
      OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
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    ps:參考www.ilanni.com/?p=13371

環境說明

  1. 要點說明

    • 使用docker bridge網路,設定靜態IP
    • 掛載hosts檔案,以便於使用hostname代替ip地址
  2. 簡要說明

    • /docker/mysql/data/mysql-m1: 存放master配置檔案
    • /docker/mysql/data/mysql-s1: 存放第一個slave配置檔案
    • /docker/mysql/data/mysql-s2: 存放第二個slave配置檔案
    • /docker/mysql/config/hosts: 本地路由

    **注意:配置完成後需要允許命令chown -R 1000:1000 /docker/mysql**

docker-compase.yml編寫

配置完後需要允許命令chown -R 1000:1000 /docker/mysql以及chmod -R 777 /docker/mysql

version: '2'
services:
  mysql-m1:
    image: mysql:5.7.22
    container_name: mysql-m1 #容器名
    volumes:
      - /docker/mysql/data/mysql-m1/:/var/lib/mysql
      - /docker/mysql/config/mysql-m1/my.cnf:/etc/my.cnf 
      - /docker/mysql/config/hosts:/etc/hosts:ro
    ports:
      - "3406:3306"
    networks: #網路
      study_net: #見跟services平級的networks,在最下邊
        ipv4_address: 192.168.8.2 #設定靜態ipv4的地址
    ulimits:
      nproc: 65535
    hostname: mysql-m1
    mem_limit: 256m #最大記憶體使用不超過1024m,
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: {your password}
  mysql-s1:
    image: mysql:5.7.22
    container_name: mysql-s1
    volumes:
      - /docker/mysql/data/mysql-s1/:/var/lib/mysql
      - /docker/mysql/config/mysql-s1/my.cnf:/etc/my.cnf 
      - /docker/mysql/config/hosts:/etc/hosts:ro
    ports:
        - "3407:3306"
    networks:
      study_net:
        ipv4_address: 192.168.8.3
    links:
        - mysql-m1
    ulimits:
        nproc: 65535
    hostname: mysql-s1
    mem_limit: 256m
    restart: always
    environment:
        MYSQL_ROOT_PASSWORD: {your password}
  mysql-s2:
    image: mysql:5.7.22
    container_name: mysql-s2
    volumes:
      - /docker/mysql/data/mysql-s2/:/var/lib/mysql
      - /docker/mysql/config/mysql-s2/my.cnf:/etc/my.cnf 
      - /docker/mysql/config/hosts:/etc/hosts:ro
    ports:
      - "3408:3306"
    links:
      - mysql-m1
    networks:
      study_net:
        ipv4_address: 192.168.8.4
    ulimits:
      nproc: 65535
    hostname: mysql-s2
    mem_limit: 256m
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: {your password}
networks: # docker網路設定
  study_net: # 自定義網路名稱
    ipam: # 要使用靜態ip必須使用ipam外掛
      driver: default
      config:
      - subnet: 192.168.8.0/24
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hosts檔案配置

檔案位置為:/docker/mysql/config/hosts

127.0.0.1   localhost
192.168.8.2  mysql-m1
192.168.8.3  mysql-s1
192.168.8.4  mysql-s2
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mysql配置檔案

  1. mysql-m1配置

配置檔案具體位置分別為:/docker/mysql/config/mysql-m1/my.cnf

配置如下:

[mysqld]
pid-file	= /var/run/mysqld/mysqld.pid
socket		= /var/run/mysqld/mysqld.sock
datadir		= /var/lib/mysql
log-error	= /var/log/mysql/error.log
# By default we only accept connections from localhost
#bind-address	= 127.0.0.1
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
lower_case_table_names=1
#給資料庫服務的唯一標識,一般為大家設定伺服器Ip的末尾號
server-id=2
log-bin=master-bin
log-bin-index=master-bin.index
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  1. mysql-s1配置

配置檔案具體位置分別為:/docker/mysql/config/mysql-s1/my.cnf

配置如下:

[mysqld]
pid-file	= /var/run/mysqld/mysqld.pid
socket		= /var/run/mysqld/mysqld.sock
datadir		= /var/lib/mysql
log-error	= /var/log/mysql/error.log
# By default we only accept connections from localhost
#bind-address	= 127.0.0.1
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
server-id=3
log-bin=s1-bin.log
sync_binlog=1
lower_case_table_names=1
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  1. mysql-s2配置

配置檔案具體位置分別為:/docker/mysql/config/mysql-s1/my.cnf

配置如下:

[mysqld]
pid-file	= /var/run/mysqld/mysqld.pid
socket		= /var/run/mysqld/mysqld.sock
datadir		= /var/lib/mysql
log-error	= /var/log/mysql/error.log
# By default we only accept connections from localhost
#bind-address	= 127.0.0.1
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
server-id=4
log-bin=s2-bin.log
sync_binlog=1
lower_case_table_names=1
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設定mysql主從複製

  1. 配置mysql-m1

進入mysql-m1的mysql命令列

docker exec -it mysql-m1 /bin/bash

mysql -u root -p
#輸入MYSQL_ROOT_PASSWORD:的值,進入mysql命令列模式.

mysql> create user repl;

#給repl使用者授予slave的許可權
#repl使用者必須具有REPLICATION SLAVE許可權,除此之外沒有必要新增不必要的許可權,密碼為repl。說明一下192.168.8.%,這個配置是指明repl使用者所在伺服器,這裡%是萬用字元,表示192.168.8.0-192.168.8.255的Server都可以以repl使用者登陸主伺服器。當然你也可以指定固定Ip。
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.8.%' IDENTIFIED BY 'repl';

mysql> flush privileges;

#鎖庫,不讓資料再進行寫入動作,這個命令在結束終端會話的時候會自動解鎖
mysql> FLUSH TABLES WITH READ LOCK;

#檢視master狀態
mysql> show master status;

#記下master-bin.000003和636一會在slave中要用.

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  1. 配置mysql-s1

進入mysql-s1的mysql命令列

docker exec -it mysql-s1 /bin/bash

mysql -u root -p
#輸入MYSQL_ROOT_PASSWORD:的值,進入mysql命令列模式.

#連線master
mysql> change master to master_host='mysql-m1',master_port=3306,master_user='repl',master_password='repl',master_log_file='master-bin.000003',master_log_pos=636;

#啟動slave
mysql> start salve;

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  1. 配置mysql-s2

參照mysql-s1的配置

驗證環境

測試master寫入後是否能夠同步到slave

#在master的mysql命令列下建立資料庫:mytest
mysql> create database mytest;

#去兩臺slave上檢視是否也有了mstest資料庫.
mysql> show databases;

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