Docker builds MySQL master-slave replication

First step ： Create a new master server instance 3307

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

The second step ： Get into /mydata/mysql-master/conf New under the directory my.cnf vim my.cnf

[mysqld]
##  Set up server_id, You need to be unique in the same LAN 
server_id=101 
##  Specify the name of the database that does not need to be synchronized 
binlog-ignore-db=mysql  
##  Turn on binary log function 
log-bin=mall-mysql-bin  
##  Set the memory size of binary log （ Business ）
binlog_cache_size=1M  
##  Set the binary log format to use （mixed,statement,row）
binlog_format=mixed  
##  Binary log expiration cleanup time . The default value is 0, Does not automatically clean up .
expire_logs_days=7  
##  Skip all errors encountered in master-slave replication or errors of the specified type , avoid slave End copy interrupt .
##  Such as ：1062 An error is a duplicate of some primary keys ,1032 The error is because the master-slave database data is inconsistent 
slave_skip_errors=1062

The third step ： Restart after modifying the configuration master example

docker restart mysql-master

Step four ： Get into mysql-master Containers ：

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

Step five ：master Create a data synchronization user in the container instance

CREATE USER 'slave'@'%' IDENTIFIED BY '123456';
GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%';

Step six ： Create a new instance from the server container 3308

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

Step seven ： Get into /mydata/mysql-slave/conf New under the directory my.cnf vim my.cnf

[mysqld]
##  Set up server_id, You need to be unique in the same LAN 
server_id=102
##  Specify the name of the database that does not need to be synchronized 
binlog-ignore-db=mysql  
##  Turn on binary log function , in preparation for Slave As an instance of another database Master When using 
log-bin=mall-mysql-slave1-bin  
##  Set the memory size of binary log （ Business ）
binlog_cache_size=1M  
##  Set the binary log format to use （mixed,statement,row）
binlog_format=mixed  
##  Binary log expiration cleanup time . The default value is 0, Does not automatically clean up .
expire_logs_days=7  
##  Skip all errors encountered in master-slave replication or errors of the specified type , avoid slave End copy interrupt .
##  Such as ：1062 An error is a duplicate of some primary keys ,1032 The error is because the master-slave database data is inconsistent 
slave_skip_errors=1062  
## relay_log Configure relay logs 
relay_log=mall-mysql-relay-bin  
## log_slave_updates Express slave Write the copy event to your own binary log 
log_slave_updates=1  
## slave Set to read only （ have super Except for users with permission ）
read_only=1

Step eight ： Restart after modifying the configuration slave example

docker restart mysql-slave

Step nine ： View the master-slave synchronization status in the master database

show master status;

Step 10 ： Get into mysql-slave Containers ：

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

Step 11 ： Configure master slave replication in the slave database

change master to master_host=' The host machine 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;

aster_host： The main database IP Address ;
master_port： The running port of the primary database ;
master_user： A user account created in the master database to synchronize 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 , By looking at the status of the master data , obtain File Parameters ;
master_log_pos： Specify where to start copying data from the database , By looking at the status of the master data , obtain Position Parameters ;
master_connect_retry： The connection failed and the time interval between retries , The unit is in seconds

The twelfth step ： View the master-slave synchronization status in the slave database

show slave status \G;

Thirteenth Step ： Start master-slave synchronization in the slave database

The fourteenth step ： Check the database status and find that it has been synchronized

The fifteenth step ：

Master slave replication test
Host new library - Use the library - new table - insert data ,ok

Slave use library - View records ,ok