关于mysql的备份方案2 A-B复制

关于mysql的备份方案2 A-B复制

 

 

 

建立A B复制之前要做好以下几步

1. 把主重的mysql 的user, group 的id 都设成27

2. 时间同步 
   ntpdate

3. 两边的数据要一样，能够正常启动
   将主的/data （数据存放目录）里的内容拷贝到从机子去或者两边都初始化一次数据； 

4. 两台机能ping 通 主：10.1.1.4   从：10.1.1.2

 

配置主服务器my.cnf 10.1.1.4
必须有

log-bin=XXXX
server-id=XXX

-----------------------参考我自己的
[mysqld]
port=3306
datadir=/data
socket=/var/run/mysqld/mysql5.socket
pid-file=/var/run/mysqld/mysql5.pid
general-log-file=/var/log/mysqld/mysql5.log
log-error=/var/log/mysqld/mysql5-error.log
log-bin=101
server-id=201

[client]
socket=/var/run/mysqld/mysql5.socket
-------------------------------------

从服务器my.cnf  10.1.1.2

server-id=2
master-host=10.1.1.4
master-user=alex
master-password=123

------------------------------- 参考我自己的
[mysqld]
port=3306
datadir=/data
socket=/var/run/mysqld/mysql5.socket
pid-file=/var/run/mysqld/mysql5.pid
general-log-file=/var/log/mysqld/mysql5.log
log-error=/var/log/mysqld/mysql5-error.log
server-id=2
master-host=10.1.1.4
master-user=tt
master-password=123

[client]
socket=/var/run/mysqld/mysql5.socket
-------------------------------

 

在主mysql服务器:

mysql>  grant super, replication slave on *.* to 'alex'@'%' identified by '123';

mysql> flush tables with read lock;   锁定数据库写入

mysql> show master status;        查询当前二进制日志信息
+------------+----------+--------------+------------------+
| File       | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------+----------+--------------+------------------+
| 101.000001 |     638  |              |                  |
+------------+----------+--------------+------------------+
1 row in set (0.00 sec)

===============================

在从服务器运行

slave  (76,92)
mysql> stop slave;
mysql> change master to
 master_host='10.1.1.4',
 master_port=3306,
 master_user='alex',
 master_password='123',
 master_log_file='101.000001',
 master_log_pos=638;
mysql> start slave;

如果出现找不到master.info 就在从的/data/下新建一个 touch master.info

mysql> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.1.1.4
                  Master_User: alex
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: 101.000001
          Read_Master_Log_Pos: 5304
               Relay_Log_File: mysql-relay-bin.000002
                Relay_Log_Pos: 245
        Relay_Master_Log_File: 101.000001
             Slave_IO_Running: Yes   
            Slave_SQL_Running: Yes   

注意：下面两个必须是yes

 Slave_IO_Running: Yes   
 Slave_SQL_Running: Yes 
=================================================
验证:

在主服务器新建1个表，插入信息让后再看看从的有没有及时更新。

mysql>UNLOCK TABLES; 解锁