[MySQL] Replication 걸기

- Replication이란?

  . DB 2개를 동일하게 동기화하는 것

  . Dual Active 구조는 권장하지 않으며, Active-Standby 구조 권장

- Replication 서버 정보

서버	IP	Port
A	192.1.1.1	3306
B	192.1.1.2	3306

- Replication 절차 ( DB 가 사용 중이지 않을 경우 )

1. 기존 slave stop 및 reset

# Server A
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)

# Server B
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)

2. 각 서버의 master reset

# Server A
mysql> reset master;
Query OK, 0 rows affected (0.00 sec)

# Server B
mysql> reset master;
Query OK, 0 rows affected (0.00 sec)

3. 각 서버의 master 정보 조회

# Server A
mysql> show master status\G;
*************************** 1. row ***************************
            File: mysql-bin.000001
     Position: 106
    Binlog_Do_DB:
Binlog_Ignore_DB:
1 row in set (0.00 sec)

ERROR:
No query specified

# Server B
mysql> show master status\G;
*************************** 1. row ***************************
            File: mysql-bin.000001
        Position: 106
    Binlog_Do_DB:
Binlog_Ignore_DB:
1 row in set (0.00 sec)

ERROR:
No query specified

4. 대국 서버의 IP, Port, master 정보로 아래의 명령어 수행

# Server A
mysql> change master to master_host='192.1.1.2', master_port=3306, master_user='root', master_password='root.123', master_log_file= 'mysql-bin.000001', master_log_pos=106;
Query OK, 0 rows affected (0.00 sec)

# Server B
mysql> change master to master_host='192.1.1.1', master_port=3306, master_user='root', master_password='root.123', master_log_file= 'mysql-bin.000001', master_log_pos=106;
Query OK, 0 rows affected (0.01 sec)

5. slave 상태 조회

# Server A
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.1.1.2
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 106
               Relay_Log_File: OAMPKB2A-relay-bin.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: No
            Slave_SQL_Running: No
              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: 106
              Relay_Log_Space: 106
              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: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
1 row in set (0.00 sec)

ERROR:
No query specified

# Server B
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.1.1.1
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 106
               Relay_Log_File: OAMPKB2B-relay-bin.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: No 
          Slave_SQL_Running: No
              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: 106
              Relay_Log_Space: 106
              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: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
1 row in set (0.00 sec)

ERROR:
No query specified

6. slave start

# Server A
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

# Server B
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

7. slave 정보 조회 

 * 아래의 2개 항목 Yes 확인

               Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

# Server A
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.1.1.2
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 106
               Relay_Log_File: OAMPKB2A-relay-bin.000002
                Relay_Log_Pos: 251
        Relay_Master_Log_File: mysql-bin.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: 106
              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:
1 row in set (0.00 sec)

ERROR:
No query specified

# Server B
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.1.1.1
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 106
               Relay_Log_File: OAMPKB2B-relay-bin.000002
                Relay_Log_Pos: 251
        Relay_Master_Log_File: mysql-bin.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: 106
              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:
1 row in set (0.00 sec)

ERROR:
No query specified