Mysql5.7 master-slave hot standby settings on CentOS

mysql Installation ：https://blog.csdn.net/qq_37135484/article/details/78594782
Premise ： Make sure that servers can communicate with each other ping through , Mutual login .

1. Server introduction

Lord （master）：192.168.78.154
from （slave）：192.168.78.155
All users are root, The password for ：123456

2. Main server configuration

1） Set up /etc/my.cnf
Main configuration server-id（ Each server is required id only ）
and log Binary system （log-bin=mysql-bin）

vim  /etc/my.cnf

Add... At the end

server-id=1
log-bin=mysql-bin
binlog-ignore-db=mysql

The effect is shown in the small picture ：

2） Set the user permissions of the slave server , It is convenient to read and copy the contents of the master server from the server users

grant replication slave,replication on *.* to 'root'@'192.168.78.155' identified by '123456';

User name and IP All are slave servers
May come across Your password does not satisfy the current policy requirements This mistake , Refer to the blog at this time https://blog.csdn.net/qq_37135484/article/details/98735515

3） Log in to the main server mysql View the status of the primary server

show master status;

Remember this time File and Position, It will be used when configuring the slave service
4） Refresh

flush privileges;

3. Slave server configuration

1） Configure from the server /etc/my.cnf

2） land mysql stay mysql Execute the following command at the command line ：

CHANGE MASTER TO MASTER_HOST='192.168.78.154',MASTER_USER='root',MASTER_PASSWORD='123456',MASTER_LOG_FILE='mysql-bin.000004',MASTER_LOG_POS=763;

Among them MASTER_LOG_FILE=‘mysql-bin.000004’,MASTER_LOG_POS=763;
Execute the command corresponding to the main server above show master status; Display data

Then start slave;

 start slave;

3） see slave state

show slave status\G

If Slave_IO_Running and Slave_SQL_Running All items are yes It means that the master-slave replication configuration is successful , Otherwise failure , Don't panic about failure , There will be an error prompt below .