Explanation of the precautions for Mysql master-slave replication

mysql> CHANGE MASTER TO MASTER_HOST='127.0.0.1', MASTER_PORT=3308, MASTER_USER='root', MASTER_PASSWORD='oldboy123', MASTER_LOG_FILE='mysql-bin.000007', MASTER_LOG_POS=797;

mysql> show slave status \G
*************************** 1. row ***************************
        Slave_IO_State: Waiting for master to send event
         Master_Host: 127.0.0.1
         Master_User: root
         Master_Port: 3308
        Connect_Retry: 60
       Master_Log_File:mysql-bin.000007
     Read_Master_Log_Pos: 797
        Relay_Log_File:mysql-relay-bin.000002
        Relay_Log_Pos: 253
    Relay_Master_Log_File: mysql-bin.000007
       Slave_IO_Running: Yes
      Slave_SQL_Running: Yes
       Replicate_Do_DB: 
     Replicate_Ignore_DB: 
      Replicate_Do_Table: 
    Replicate_Ignore_Table: 
   Replicate_Wild_Do_Table: 
 Replicate_Wild_Ignore_Table: 
          Last_Errno: 0
          Last_Error: 
         Skip_Counter: 0
     Exec_Master_Log_Pos: 797
       Relay_Log_Space: 409
       Until_Condition: None
        Until_Log_File: 
        Until_Log_Pos: 0
      Master_SSL_Allowed: No
      Master_SSL_CA_File: 
      Master_SSL_CA_Path: 
       Master_SSL_Cert: 
      Master_SSL_Cipher: 
        Master_SSL_Key: 
    Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
        Last_IO_Errno: 0
        Last_IO_Error: 
        Last_SQL_Errno: 0
        Last_SQL_Error: 
 Replicate_Ignore_Server_Ids: 
       Master_Server_Id: 3308

mysql> stop slave;
Query OK, 0 rows affected (0.02 sec)
mysql> set global sql_slave_skip_counter=1;
Query OK, 0 rows affected (0.00 sec)
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

log-slave-updates
log-bin = /data/3309/data/mysql-bin #Write expire_logs_days = 7 according to the actual situation #Equivalent to find /data/3309/data -type f -name "mysql-bin.000* -mtime +7 | xargs rm -f"