Docker installs mysql master-slave replication

1. Create a new main server container instance 3307

docker run -d -p 3307:3306 -v /mydata/mysql-master/log:/var/log/mysql -v /mydata/mysql-master/data:/var/lib/mysql -v /mydata/mysql-master/conf:/etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD=root  --name mysql-master mysql:5.7

2. Enter the /mydata/mysql-master/conf directory to create a new my.cnf

vim my.cnf

[mysqld]
## 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

3. Restart the master instance after modifying the configuration

docker restart mysql-master

4. Enter the mysql-master container

docker exec -it mysql-master /bin/bash
mysql -uroot -proot

5. Create a data synchronization user in the master container instance

CREATE USER 'slave'@'%' IDENTIFIED BY '123456';

GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%';

6. Create a new slave server container instance 3308

docker run -d -p 3308:3306 --privileged=true -v /mydata/mysql-slave/log:/var/log/mysql -v /mydata/mysql-slave/data:/var/lib/mysql -v /mydata/mysql-slave/conf:/etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD=root  --name mysql-slave mysql:5.7

7. Enter the /mydata/mysql-slave/conf directory to create a new my.cnf

vim my.cnf

[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

8. Restart the slave instance after modifying the configuration

docker restart mysql-slave

9. View the master-slave synchronization status in the master database

show master status;

10. Enter the mysql-slave container

docker exec -it mysql-slave /bin/bash

mysql -uroot -proot

11. Configure master-slave replication in the slave database

change master to master_host='宿主机ip', master_user='slave', master_password='123456', master_port=3307, master_log_file='mall-mysql-bin.000001', master_log_pos=617, master_connect_retry=30;

Master-slave replication command parameter description

master_host: the IP address of the master database;

master_port: the running port of the master database;

master_user: the user account created in the master database for synchronizing data;

master_password: the user password created in the master database for synchronizing data;

master_log_file: Specify the log file to copy data from the database, and obtain 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: The time interval for retrying a connection failure, in seconds.

12. View the master-slave synchronization status in the slave database

show slave status \G;

13. Enable master-slave synchronization in the slave database

14. View the status of the slave database and find that it has been synchronized

15. Master-slave replication test

Create a new library on the host - use the library - create a new table - insert data

Slave use library - view records