MySQL Replication

준비 : 서버 2대와 각각의 서버에 mysql 설치되어있는 상태

 

Master 서버 부분

1. mysql 환경 설정

[vi /etc/my.cnf]

[mysqld]
log-bin=mysql-bin
server-id=1
binlog_do_db=EdgeDB

 

2. mysql 계정 생성(slave에서 master로 접속할 계정)

mysql> grant all privileges on *.* to 'repl'@'%' identified by '';

 

3. systemctl restart mysqld

mysql 재시작

 

 

4. master 서버 정보 확인

 mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 |     1956 | EdgeDB       |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

여기서 file 이름과 position 위치를 알고 있어야 한다.

 

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Slave 서버 부분

1. slave서버에 master에 있는 db명과 같은 디비 생성(만약 dump 파일로 db를 옮긴 상태라면 이 과정은 필요없다.)

 mysql> create database EdgeDB default character set utf8;

 

2. slave 서버 mysql 환경 설정

[vi /etc/my.cnf]

[mysqld]
server-id=2
binlog_do_db=EdgeDB
slave-skip-errors=all
read_only=1

 

3. systemctl restart mysqld

mysql 재시작

 

 

4. slave 서버의 mysql 내부 설정

mysql> change master to
master_host='마스터ip주소',
master_user='repl',
master_password='repl의 비번',
master_log_file='mysql-bin.000002',
master_log_pos=1956;

 

---

5. 연결 확인(master)

mysql> show processlist\G
*************************** 1. row ***************************
     Id: 106
   User: repl
   Host: slave서버ip:50896
     db: NULL
Command: Binlog Dump
   Time: 3537
  State: Master has sent all binlog to slave; waiting for more updates
   Info: NULL

6 slave 서버에서...

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: master ip주소
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 1956
               Relay_Log_File: mysqld-relay-bin.000002
                Relay_Log_Pos: 1740
        Relay_Master_Log_File: mysql-bin.000002
             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: 1956
              Relay_Log_Space: 1914
              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: 1
                  Master_UUID: b9ea7ac5-207f-11e9-b5f6-1866da603378
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
           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:
                Auto_Position: 0
1 row in set (0.00 sec)

Last_IO_Errno: 0

Last_IO_Error:

위와 같이 에러 내용이 없어야 한다.

 

실제로 마스터 mysql에서 데이터를 입출력 하면 slave에 데이터가 입출력 되는것을 확인 가능하다.