MySQL master-slave configuration

One 、 Main service name master, From the server slave

	  master server : master
	  From the server : slave  
	  The master and slave servers must have the same mysql To configure , Versions need to be consistent , You also need to build a similar database .

1. Modify the main service my.cnf The configuration file

   [[email protected] mysql]# vi /etc/my.cnf
   
   # Main database side ID Number  [ must ] The server is unique ID  Cannot be connected with the slave server id identical 
   server_id = 1
   
   # Turn on binary log 
   log-bin = mysql-bin
   
   # Database name to be copied , If you copy multiple databases , Repeat this option 
   binlog-do-db = im
   

2. Modify from server my.cnf The configuration file

   # From the server only ID [ must ] The server is unique ID, Can't communicate with the main server id identical 
   server-id=2 
   # Enable relay logging 
   relay-log=mysql-relay
   

3. Set up an account on the primary server and authorize slave:

   
    ## master_test: account number 
    ## root123456： password 
    ##  From the server ip: 127.0.0.1 
    ##  Get into mysql  Execute the following command 
    
     grant replication slave on *.* to [email protected].0.0.1 identified by "root123456";
     
   ##  Generally do not use root Account number ,“%” Indicates that all clients may be connected to , Just account number , The password is correct , Specific clients are available here IP Instead of , Such as 192.168.145.226, Enhance security .
   

4. Log in to the main server mysql, Inquire about master The state of

   mysql> show master status;
   +------------------+----------+--------------+------------------+-------------------+
   | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
   +------------------+----------+--------------+------------------+-------------------+
   | mysql-bin.000001 |    16316 | im           |                  |                   |
   +------------------+----------+--------------+------------------+-------------------+
   1 row in set (0.00 sec)
   

   File : mysql-bin.000001 Position 16316
   These two values need to be copied in advance from the server configuration for standby

5. Configure slave Slave：

      mysql>change master to master_host=' master server ip',master_user='master_test',master_password='root123456',
            master_log_file='mysql-bin.000001',master_log_pos=16316;   //308 There is no single quotation mark around the number . 
   

6. Start copy from server

   start slave; 
   

7. Check the status of the copy function from the server

     show slave status\G;
   

8. These two values must be equal to Yes To synchronize successfully
   
   notes ：Slave_IO And Slave_SQL The process must run properly , namely YES state , Otherwise, it's all wrong ( Such as ： One of them NO It's all wrong ).