MySQL5.6主从复制(mysql数据同步配置)(2)-木庄网络博客

10、对从数据库服务器做相应设置，指定复制使用的用户，主数据库服务器的IP、端口以及开始执行复制的日志文件和位置等

mysql> change master to 
    ->  master_host='192.168.56.2',
    ->  master_user='rep1',
    ->  master_port=3306,
    ->  master_password='123456',
    ->  master_log_file='mysqlbin.000021',
    ->  master_log_pos=120;
Query OK, 0 rows affected, 2 warnings (0.08 sec)

11、在从库上，启动slave线程

mysql> start slave;
Query OK, 0 rows affected (0.17 sec)

12、从库上查看进程

mysql> show processlist \G;
*************************** 1. row ***************************
     Id: 1
   User: root
   Host: localhost
     db: zx
Command: Query
   Time: 0
  State: init
   Info: show processlist
*************************** 2. row ***************************
     Id: 4
   User: system user
   Host: 
     db: NULL
Command: Connect
   Time: 1484
  State: Waiting for master to send event
   Info: NULL
*************************** 3. row ***************************
     Id: 5
   User: system user
   Host: 
     db: NULL
Command: Connect
   Time: 739
  State: Slave has read all relay log; waiting for the slave I/O thread to update it
   Info: NULL
3 rows in set (0.00 sec)

mysql> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.56.2
                  Master_User: rep1
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysqlbin.000021
          Read_Master_Log_Pos: 652
               Relay_Log_File: rhel6-relay-bin.000002
                Relay_Log_Pos: 814
        Relay_Master_Log_File: mysqlbin.000021
             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: 652
              Relay_Log_Space: 987
              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: 3743271b-aa6d-11e6-aa2e-080027e5f5dd
             Master_Info_File: /mysqldata/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)

Slave_IO_Running和Slave_SQL_Running全部为YES才算搭建成功。如果出错查看报错原因。我搭建时遇到的两个错误：

(1)Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work.

原因：搭建时把主库整个目录复制过来的，主库和从库的UUID一致了，修改从库的UUID即可。

方法：修改$datadir/auto.cnf，按照16进制格式随便改一下，重启mysql即可。

(2)Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file'

原因：配置change master to时把master_log_file配置错误

方法：change master to master_log_file='mysqlbin.000021';start slave;即可。

13、测试复制的正确性

主库
mysql> create database zx;
Query OK, 1 row affected (0.05 sec)

mysql> use zx;
Database changed
mysql> create table t(id int);
Query OK, 0 rows affected (0.09 sec)

mysql> insert into t values(1),(2),(3);
Query OK, 3 rows affected (0.01 sec)
Records: 3  Duplicates: 0  Warnings: 0
从库
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| data               |
| mysql              |
| performance_schema |
| test               |
| test1              |
| zx                 |
+--------------------+
7 rows in set (0.00 sec)

mysql> use zx
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from t;
+------+
| id   |
+------+
|    1 |
|    2 |
|    3 |
+------+
3 rows in set (0.00 sec)

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