There are two types of replication.

• Master-Master - Both databases are masters, meaning both can be used for reading and writing.
• Master-Slave - One database is the master, the other is the slave. Only the master can read and write, the slave can only read.

The show slave status command can be used to display the status of the slave. This assume you are able to log into your MariaDB or mySQL server or you have configured passwordless authentication and will be using the -e command line option.

~]# mysql -e "show slave status \G"
*************************** 1. row ***************************
               Slave_IO_State: Waiting for source to send event
                  Master_Host: server1.example.com
                  Master_User: replication_user
                  Master_Port: 3306
                Connect_Retry: 100
              Master_Log_File: binary-log.000001
          Read_Master_Log_Pos: 156
               Relay_Log_File: relay-bin.000002
                Relay_Log_Pos: 373
        Relay_Master_Log_File: binary-log.000001
             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: 156
              Relay_Log_Space: 579
              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: 2
                  Master_UUID: 0ea5da70-0481-11ec-9cef-96f1f3f0d86b
             Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Replica has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 6006451a-022c-11ec-9da1-98799582ca6f:1-50246
                Auto_Position: 1
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
       Master_public_key_path: 
        Get_master_public_key: 1
            Network_Namespace: