Docker容器启动Mysql，Docker实现Mysql主从，读写分离

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相关内容原文地址：

博客园： 当我遇上你csy：Docker实战之MySQL主从复制
CSDN：liumiaocn：MySQL: 容器化方式启动

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一、Docker文件编排

编排docker-compose-mysql-cluster.yml,安装master和slave节点：

version: '3'
services:
  mysql-master:
    image: mysql:5.7
    container_name: mysql-master
    environment:
      - MYSQL_ROOT_PASSWORD=root
    ports:
      - "3307:3306"
    volumes:
      - "./mysql/master/my.cnf:/etc/my.cnf"
      - "./mysql/master/data:/var/lib/mysql"
    links:
      - mysql-slave

  mysql-slave:
    image: mysql:5.7
    container_name: mysql-slave
    environment:
      - MYSQL_ROOT_PASSWORD=root
    ports:
      - "3308:3306"
    volumes:
      - "./mysql/slave/my.cnf:/etc/my.cnf"
      - "./mysql/slave/data:/var/lib/mysql"

1. 配置master配置文件my.cnf

[mysqld]
# [必须]启用二进制日志
log-bin=mysql-bin 
# [必须]服务器唯一ID，默认是1，一般取IP最后一段  
server-id=1
## 复制过滤：也就是指定哪个数据库不用同步（mysql库一般不同步）
binlog-ignore-db=mysql

2. 配置slave配置文件my.cnf

[mysqld]
# [必须]服务器唯一ID，默认是1，一般取IP最后一段  
server-id=2

3. 启动docker-compose，创建docker镜像文件

docker-compose -f docker-compose-mysql-cluster.yml up -d

通过docker ps可查看已启动的实例容器。

二、配置主从复制

2.1 配置master

2.2 配置slave

三、验证主从复制

3.1 master创建db

查看slave是否同步创建：

四、读写分离

MySQL主从复制是其自己的功能，实现读写分离就得依靠其他组件了，比如sharding-jdbc。但是sharding-jdbc只是实现读写分离，本身的权限控制还是需要MySQL这边来配置的。

1. 配置master账户及权限
   创建帐号并授予读写权限：

CREATE USER 'master'@'%' IDENTIFIED BY 'Password123';
GRANT select,insert,update,delete ON *.* TO 'master'@'%';
flush privileges;

1. 配置slave账户及权限
   创建帐号并授予只读权限：

use mysql;
CREATE USER 'slave'@'%' IDENTIFIED BY 'Password123';
GRANT select ON *.* TO 'slave'@'%';
FLUSH PRIVILEGES;

五、Docker启动Mysql

docker run --name mysql -d                          \
           -e MYSQL_ROOT_PASSWORD=liumiao123        \
           -e TZ=Asia/Shanghai                      \
           -v `pwd`/mysql/data/:/var/lib/mysql      \
           -v `pwd`/mysql/conf.d/:/etc/mysql/conf.d \
           -p 32011:3306 liumiaocn/mysql:5.7.16

进入mysql容器内部：

docker exec -it mysql sh

六、Docker-Compose方式

liumiaocn:mysql liumiao$ cat docker-compose.yaml 
version: '2'

services:
  # database service: mysql
  mysql:
    image: liumiaocn/mysql:5.7.16
    ports:
      - "32011:3306"
    volumes:
      - ./mysql/data/:/var/lib/mysql
      - ./mysql/conf.d/:/etc/mysql/conf.d
    environment:
      - TZ=Asia/Shanghai
      - MYSQL_ROOT_PASSWORD=liumiao123
    restart: "no"
liumiaocn:mysql liumiao$

启动示例：

liumiaocn:mysql liumiao$ ls
docker-compose.yaml
liumiaocn:mysql liumiao$ docker-compose up -d
Creating network "mysql_default" with the default driver
Creating mysql_mysql_1 ... done
liumiaocn:mysql liumiao$

结果确认：

liumiaocn:mysql liumiao$ docker-compose ps
    Name                  Command             State            Ports         
-----------------------------------------------------------------------------
mysql_mysql_1   docker-entrypoint.sh mysqld   Up      0.0.0.0:32011->3306/tcp
liumiaocn:mysql liumiao$ 
liumiaocn:mysql liumiao$ docker exec -it mysql_mysql_1 sh
# mysql -uroot -pliumiao123
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.16 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
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