Mysql数据库中怎么创建从库

今天就跟大家聊聊有关MySQL数据库中怎么创建从库，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

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首先参考http://blog.itpub.net/28536251/viewspace-2138854/分别在两节点安装Mysql。

1、主库从库安装备份软件
[root@D2-wetestdb160 ~]# yum install -y perl-DBD-MySQL perl-DBI  perl-Time-HiRes
[root@D2-wetestdb160 ~]# rpm -ivh libev-4.15-6.el7.x86_64.rpm percona-xtrabackup-24-2.4.5-1.el7.x86_64.rpm
 
2、主库备份数据库
[root@D2-wetestdb160 ~]# mkdir /data/backup
[root@D2-wetestdb160 ~]# innobackupex --user=root --password=123456 /data/backup
[root@D2-wetestdb160 ~]# tar -cvzf mysqlbackup84106_0113.tar.gz /data/backup/2017-01-13_11-17-22/
[root@D2-wetestdb160 ~]# scp mysqlbackup84106_0113.tar.gz root@10.163.89.245:/root
 
3、从库进行恢复
[root@D2-stone245 ~]# tar -xvzf mysqlbackup84106_0113.tar.gz -C /var/lib/mysql
[root@D2-stone245 ~]# innobackupex --apply-log /var/lib/mysql/data/backup/2017-01-13_11-17-22/
[root@D2-stone245 ~]# chown -R mysql:mysql /var/lib/mysql/data/backup/2017-01-13_11-17-22
 
4、从库修改配置文件
[root@D2-stone245 ~]# /etc/init.d/mysqld stop
[root@D2-stone245 ~]# vim /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql/data/backup/2017-01-13_11-17-22/
server-id=89254
 
[root@D2-stone245 ~]# /etc/init.d/mysql.server start
 
5、从库配置复制
[root@D2-stone245 ~]# cat /var/lib/mysql/data/backup/2017-01-13_11-17-22/xtrabackup_binlog_info
mysql-bin.000010        100927559
 
mysql> CHANGE MASTER TO MASTER_HOST='10.163.84.160',MASTER_PORT=3306,MASTER_USER='repl',MASTER_PASSWORD='replsafe',MASTER_LOG_FILE='mysql-bin.000010',MASTER_LOG_POS=100927559;
Query OK, 0 rows affected, 2 warnings (0.01 sec)
 
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
 
 
mysql> set global read_only=1;
Query OK, 0 rows affected (0.00 sec)
 
mysql> show global variables like "%read_only%";
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| innodb_read_only | OFF   |
| read_only        | ON    |
| super_read_only  | OFF   |
| tx_read_only     | OFF   |
+------------------+-------+
4 rows in set (0.01 sec)
 
 
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.163.84.160
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000011
          Read_Master_Log_Pos: 1719
               Relay_Log_File: D2-stone245-relay-bin.000003
                Relay_Log_Pos: 1932
        Relay_Master_Log_File: mysql-bin.000011
             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: 1719
              Relay_Log_Space: 6430
              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: 1016384160
                  Master_UUID: 9ee791f2-ad84-11e6-932d-0050568a6255
             Master_Info_File: /var/lib/mysql/data/backup/2017-01-13_11-17-22/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave 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:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)

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