Docker installs mysql5.7 master-slave replication

Find the version ready to install mysql

https://hub.docker.com/_/mysql/tags

• docker pull mysql:5.7

Create a new mysql container instance

ps: Change /opt/glpra/mysql/conf to your own local mapping path

Order:

docker run -d -p 3306:3306 --privileged=true -v /opt/glpra/mysql/log:/var/log/mysql -v /opt/glpra/mysql/data:/var/lib/mysql -v /opt/glpra/mysql/conf:/etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD=123456 --name mysql mysql:5.7

Create a new my.cnf to solve the Chinese garbled problem and configuration

[client]
default_character_set=utf8
[mysqld]
collation_server = utf8_general_ci
character_set_server = utf8
## 设置server_id，同一局域网中需要唯一
server_id=101 
## 指定不需要同步的数据库名称
binlog-ignore-db=mysql
## 开启二进制日志功能
log-bin=mall-mysql-bin  
## 设置二进制日志使用内存大小（事务）
binlog_cache_size=1M
## 设置使用的二进制日志格式（mixed,statement,row）
binlog_format=mixed
## 二进制日志过期清理时间。默认值为0，表示不自动清理。
expire_logs_days=7
## 跳过主从复制中遇到的所有错误或指定类型的错误，避免slave端复制中断。
## 如：1062错误是指一些主键重复，1032错误是因为主从数据库数据不一致
slave_skip_errors=1062

Enter the mysql-master container

• docker exec -it mysql /bin/bash
  进入mysql
  mysql -uroot -proot

Create a data synchronization user in the master container instance

1: Create a user
2: Authorize this user, which read and write operation permissions can be done

• CREATE USER ‘slave’@‘%’ IDENTIFIED BY ‘123456’;
• GRANT REPLICATION SLAVE, REPLICATION CLIENT ON . TO ‘slave’@‘%’;

Create a new slave mysql-slave container instance

ps: Change /opt/glpra/mysql/conf to your own local mapping path

• Master-slave replication command parameter description
  master_host: IP address of the master database;
  master_port: running port of the master database;
  master_user: user account created in the master database for synchronizing data;
  master_password: user created in the master database for synchronizing data Password;
  master_log_file: Specifies the log file to copy data from the database, and obtains the File parameter by viewing the status of the master data;
  master_log_pos: specifies where to start copying data from the database, and obtains the Position parameter by viewing the status of the master data;
  master_connect_retry: Interval between retries on connection failures, in seconds.

Order:

docker run -d -p 3307:3306 --privileged=true -v /opt/glpra/mysql-slave/log:/var/log/mysql -v /opt/glpra/mysql-slave/data:/var/lib/mysql -v /opt/glpra/mysql-slave/conf:/etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD=123456 --name mysql-slave mysql:5.7

## 进入/mydata/mysql-slave/conf目录下新建my.cnf
- vim my.cnf

```bash
[mysqld]
## 设置server_id，同一局域网中需要唯一
server_id=102
## 指定不需要同步的数据库名称
binlog-ignore-db=mysql  
## 开启二进制日志功能，以备Slave作为其它数据库实例的Master时使用
log-bin=mall-mysql-slave1-bin  
## 设置二进制日志使用内存大小（事务）
binlog_cache_size=1M  
## 设置使用的二进制日志格式（mixed,statement,row）
binlog_format=mixed  
## 二进制日志过期清理时间。默认值为0，表示不自动清理。
expire_logs_days=7  
## 跳过主从复制中遇到的所有错误或指定类型的错误，避免slave端复制中断。
## 如：1062错误是指一些主键重复，1032错误是因为主从数据库数据不一致
slave_skip_errors=1062  
## relay_log配置中继日志
relay_log=mall-mysql-relay-bin  
## log_slave_updates表示slave将复制事件写进自己的二进制日志
log_slave_updates=1  
## slave设置为只读（具有super权限的用户除外）
read_only=1

Restart the slave instance after modifying the configuration

• docker restart mysql-slave
  

View the master-slave synchronization status in the master database

• show master status;
  

Enter the mysql-slave container

• docker exec -it mysql-slave /bin/bash
• Enter mysql to configure master-slave replication in the slave database

change master to master_host='192.168.58.130', master_user='slave', master_password='123456', master_port=3306, master_log_file='mall-mysql-bin.000001', master_log_pos=617, master_connect_retry=30;

• View the master-slave synchronization status in the slave database

show slave status \G;

• Enable master-slave synchronization in the slave database

start slave;

• Check the status of the slave database and find that it has been synchronized
  

Master-slave replication test

• Host new library - use library - new table - insert data
  main library - create table:
  main library - view inserted table data
  

• Slave use library - view records
  

Finish