Mysql 主从复制

安装mysql

 

# tar zxvf mysql-max-5.0.27-linux-i686-glibc23.tar.gz
# groupadd mysql
# useradd -g mysql mysql
# mv mysql-max-5.0.27-linux-i686-glibc23 mysql
# cd mysql
# chown -R mysql:mysql .
# cp support-files/mysql.server /etc/rc.d/init.d/mysqld
# chmod +x /etc/rc.d/init.d/mysqld
# cp support-files/my-medium.cnf /etc/my.cnf
# scripts/mysql_install_db --user=mysql
# chkconfig --add mysqld
# ln -s /usr/local/mysql/bin/mysql /usr/bin/mysql

 

主 10.99.99.50

从 10.99.99.52

 

编辑主配置文件

# vi /etc/my.cnf

 

在[mysqld]下添加

server-id=1

log-bin

保存退出

#service mysqld restart

 

# mysql

mysql>grant replication slave on *.* to 'bakup'@'10.99.99.52' identified by '123';

mysql>show master status;

 

+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 |       98 | zld          |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

记下File和Position下的值

 

编辑从配置文件

# vi /etc/my.cnf

 

在[mysqld]下添加

server-id=2
master-host=10.99.99.50
master-user=bakup
master-passwor=123
master-port=3306
master-connect-retry=60
replicate-do-db=zld
log-bin
binlog-do-db=zld

保存退出

#service mysqld restart

#mysql

mysql>slave stop

mysql>change master to master_host='10.99.99.50',master_user='bakup',master_pas
sword='123',master_log_file='mysql-bin.000005',master_log_pos=98;
mysql>slave start

mysql>show slave status \G

 

*************************** 1. row ***************************
             Slave_IO_State:
                Master_Host: 10.99.99.50
                Master_User: bakup
                Master_Port: 3306
              Connect_Retry: 60
            Master_Log_File: mysql-bin.000004
        Read_Master_Log_Pos: 98
             Relay_Log_File: test-relay-bin.000001
              Relay_Log_Pos: 98
      Relay_Master_Log_File: mysql-bin.000004
           Slave_IO_Running: No
          Slave_SQL_Running: Yes
            Replicate_Do_DB: zld
        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: 98
            Relay_Log_Space: 98
            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
1 row in set (0.00 sec)

 

发现 Slave_IO_Running: No，这表示不成功，应该为yes

查看mysql日志

# cat /usr/local/mysql/data/test.com.err

 

[ERROR] The slave I/O thread stops because master and slave have equal MySQL server ids; these ids must be different for replication to work (or the --replicate-same-server-id option must be used on slave but this does not always make sense; please check the manual before using it).

 

解决办法：

#  vi /etc/my.cnf

 在[mysqld]下添加

replicate-same-server-id

保存退出

# service mysqld restart

 

#mysql

mysql>show slave status\G

*************************** 1. row ***************************
             Slave_IO_State: Waiting for master to send event
                Master_Host: 10.99.99.50
                Master_User: bakup
                Master_Port: 3306
              Connect_Retry: 60
            Master_Log_File: mysql-bin.000004
        Read_Master_Log_Pos: 98
             Relay_Log_File: test-relay-bin.000003
              Relay_Log_Pos: 235
      Relay_Master_Log_File: mysql-bin.000004
           Slave_IO_Running: Yes
          Slave_SQL_Running: Yes
            Replicate_Do_DB: zld
        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: 98
            Relay_Log_Space: 235
            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
1 row in set (0.01 sec)

发现已经变为 Slave_IO_Running: Yes ，表示成功

 

测试

 

主

 

#mysql

mysql> create database zld;

mysql>use zld;

mysql>create table user(id int);

mysql>insert into user values('1');

 

从

#mysql

mysql>show databases;

mysql>use zld;

mysql>select * from user;

 

可以看到在主上创建的内容全部都显示在从上

 

做这个测试的时候注意的问题就是出现问题要看mysql的日志，可以去网上搜索错误的提示获得帮助。