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Xtrabackup备份从库的问题

Posted on Edited on In

环境介绍

  • 数据库信息
    主库IP：192.168.1.130
    从库IP：192.168.1.132
    主库MySQL版本：5.6.36
    从库MySQL版本：5.6.35
  • 配置信息
    主从开启GTID复制
    主库参数配置:gtid-mode=ON;enforce-gtid-consistency=ON
    从库参数配置:gtid-mode=ON,enforce-gtid-consistency=ON;log-slave-update=ON;master_info_repository=TABLE;relay_log_info_repository=TABLE

测试步骤

  • 搭建主从复制，搭建步骤在此省略

  • 使用Xtrabackup备份从库数据

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    备份从库
    [root@host-192-168-1-132 backup]# innobackupex --defaults-file=/etc/my.cnf --user=xtrabackup --password=xtrabackup --slave-info --no-timestamp /tmp/backup
    应用日志
    [root@host-192-168-1-132 backup]# innobackupex --defaults-file=/etc/my.cnf --apply-log /tmp/backup

  • 清空从库数据，并使用备份恢复从库

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    [root@host-192-168-1-132 mysqldata1]# innobackupex --defaults-file=/etc/my.cnf --copy-back /tmp/backup/
    [root@host-192-168-1-132 mysqldata1]# chown -R mysql:mysql /home/mysql

  • 查看xtrabckup中备份的slave信息

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    [root@host-192-168-1-132 backup]# cat xtrabackup_slave_info 
    SET GLOBAL gtid_purged='05dff9fd-5c97-11e7-b3f4-fa163ea44438:1-7';
    CHANGE MASTER TO MASTER_AUTO_POSITION=1

  • 启动从库，查看从库信息

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    [root@host-192-168-1-132 mysqldata1]# service mysqld start

    mysql> show slave status\G
    *************************** 1. row ***************************
                   Slave_IO_State: 
                      Master_Host: 192.168.1.130
                      Master_User: repl
                      Master_Port: 6306
                    Connect_Retry: 60
                  Master_Log_File: mysql-bin.000002
              Read_Master_Log_Pos: 1615
                   Relay_Log_File: mysql-relay-bin.000002
                    Relay_Log_Pos: 649
            Relay_Master_Log_File: mysql-bin.000002
                 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: 1856
                  Relay_Log_Space: 0
                  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: 
      Replicate_Ignore_Server_Ids: 
                 Master_Server_Id: 0
                      Master_UUID: 05dff9fd-5c97-11e7-b3f4-fa163ea44438
                 Master_Info_File: mysql.slave_master_info
                        SQL_Delay: 0
              SQL_Remaining_Delay: NULL
          Slave_SQL_Running_State: 
               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: 1
    1 row in set (0.00 sec)

    mysql> show master status;
    +------------------+----------+--------------+------------------+-------------------+
    | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
    +------------------+----------+--------------+------------------+-------------------+
    | mysql-bin.000001 |      151 |              |                  |                   |
    +------------------+----------+--------------+------------------+-------------------+
    1 row in set (0.00 sec)

    mysql> set global gtid_purged='05dff9fd-5c97-11e7-b3f4-fa163ea44438:1-7';
    Query OK, 0 rows affected (0.08 sec)

    mysql> start slave;
    ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository

  • start slave的时候出现错误，于是重置了slave信息，重新change master 解决问题

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    mysql> reset slave all;
    Query OK, 0 rows affected (0.03 sec)

    mysql> change master to
        -> master_host='192.168.1.130',
        -> master_user='repl',
        -> master_password='repl',
        -> master_port=6306,
        -> master_auto_position=1;
    Query OK, 0 rows affected, 2 warnings (0.35 sec)

    mysql> start slave;
    Query OK, 0 rows affected (0.02 sec)

    mysql> show slave status\G
    *************************** 1. row ***************************
                   Slave_IO_State: Waiting for master to send event
                      Master_Host: 192.168.1.130
                      Master_User: repl
                      Master_Port: 6306
                    Connect_Retry: 60
                  Master_Log_File: mysql-bin.000002
              Read_Master_Log_Pos: 1856
                   Relay_Log_File: mysql-relay-bin.000002
                    Relay_Log_Pos: 408
            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: 1856
                  Relay_Log_Space: 612
                  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: 3656
                      Master_UUID: 05dff9fd-5c97-11e7-b3f4-fa163ea44438
                 Master_Info_File: mysql.slave_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: 05dff9fd-5c97-11e7-b3f4-fa163ea44438:1-7
                    Auto_Position: 1
    1 row in set (0.00 sec)

总结

  • XtraBackup备份从库的时候，利用备份恢复数据之后，第一次启动数据库的时候，不会启动I/O线程和SQL线程
  • Xtrabackup备份从库，虽然保存了原先slave中chang master to的信息，但是不能直接start slave；需要reset slave all之后重新指定主库信息
  • Xtrabackup备份从库，不会备份GTID_PURGED的信息，需要恢复的时候，自己指定

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