docker-compase搭建mysql主從複製

準備工做

1. 版本說明

   版本以下所示：

   • mysql:5.7.22

   本教程全部工具和數據目錄存放於/docker目錄下

2. 安裝docker

   詳情見docs.docker.com/install/lin…

3. 安裝docker-compose

   這裏簡單介紹下兩種安裝docker-compose的方式，第一種方式相對簡單，可是因爲網絡問題，經常安裝不上，而且常常會斷開，第二種方式略微麻煩，可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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     查看版本信息：

     docker-compose --version
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     可是此方法會常常由於網絡的緣由而沒法安裝

   • 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，便可安裝docker-compose

   • 安裝完成以下所示：

     [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網絡,設置靜態IP
   • 掛載hosts文件,以便於使用hostname代替ip地址

2. 簡要說明

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

   **注意：配置完成後須要容許命令chown -R 1000:1000 /docker/mysql**

docker-compase.yml編寫

配置完後須要容許命令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: #網絡
      study_net: #見跟services平級的networks,在最下邊
        ipv4_address: 192.168.8.2 #設置靜態ipv4的地址
    ulimits:
      nproc: 65535
    hostname: mysql-m1
    mem_limit: 256m #最大內存使用不超過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網絡設置
  study_net: # 自定義網絡名稱
    ipam: # 要使用靜態ip必須使用ipam插件
      driver: default
      config:
      - subnet: 192.168.8.0/24
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hosts文件配置

文件位置爲：/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配置文件

1. mysql-m1配置

配置文件具體位置分別爲：/docker/mysql/config/mysql-m1/my.cnf

配置以下：

[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
#給數據庫服務的惟一標識，通常爲你們設置服務器Ip的末尾號
server-id=2
log-bin=master-bin
log-bin-index=master-bin.index
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2. mysql-s1配置

配置文件具體位置分別爲：/docker/mysql/config/mysql-s1/my.cnf

配置以下：

[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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3. mysql-s2配置

配置文件具體位置分別爲：/docker/mysql/config/mysql-s1/my.cnf

配置以下：

[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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設置mysql主從複製

1. 配置mysql-m1

進入mysql-m1的mysql命令行

docker exec -it mysql-m1 /bin/bash

mysql -u root -p
#輸入MYSQL_ROOT_PASSWORD:的值,進入mysql命令行模式.

mysql> create user repl;

#給repl用戶授予slave的權限
#repl用戶必須具備REPLICATION SLAVE權限，除此以外沒有必要添加沒必要要的權限，密碼爲repl。說明一下192.168.8.%，這個配置是指明repl用戶所在服務器，這裏%是通配符，表示192.168.8.0-192.168.8.255的Server均可以以repl用戶登錄主服務器。固然你也能夠指定固定Ip。
mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.8.%' IDENTIFIED BY 'repl';

mysql> flush privileges;

#鎖庫,不讓數據再進行寫入動做,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;

#查看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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2. 配置mysql-s1

進入mysql-s1的mysql命令行

docker exec -it mysql-s1 /bin/bash

mysql -u root -p
#輸入MYSQL_ROOT_PASSWORD:的值,進入mysql命令行模式.

#鏈接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;

#啓動slave
mysql> start salve;

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3. 配置mysql-s2

參照mysql-s1的配置

驗證環境

測試master寫入後是否可以同步到slave

#在master的mysql命令行下建立數據庫:mytest
mysql> create database mytest;

#去兩臺slave上查看是否也有了mstest數據庫.
mysql> show databases;

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