server-id = 2 #DB1和DB2的id 必须不同
log-bin=mysql-bin  #开启mysql的二进制日志功能
relay-log = mysql-relay-bin #定义中继日志的命名格式
replicate-wild-ignore-table=mysql.% #不复制的数据库或表
replicate-wild-ignore-table=test.% #不复制的数据库或表
replicate-wild-ignore-table=information_schema.% #不复制的数据库或表

grant replication slave on *.*  to  "chen"@"172.16.1.101" identified by "123456";
show master status;
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 | 106         |                    |　　　　　　　　　  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

mysql > change master to         master_host="172.16.1.100",
        master_user="chen",
        master_password="123456",
        master_log_file="mysql-bin.000006",
        master_log_pos=106;        

mysql > start slave;

mysql > show slave status;
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.16.1.100
                  Master_User: chen
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000009
          Read_Master_Log_Pos: 106
               Relay_Log_File: mysql-relay-bin.000021
                Relay_Log_Pos: 251
        Relay_Master_Log_File: mysql-bin.000009
             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: mysql.%,test.%,information_schema.%
                   Last_Errno: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 106
              Relay_Log_Space: 551
              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: 
1 row in set (0.00 sec)

ERROR: 
No query specified

[root@db2 ~]# vim /etc/keepalived/keepalived.conf 
 auth_type PASS
 auth_pass 1111
 }
 virtual_ipaddress {
 172.16.1.99
 }
}
virtual_server 172.16.1.99 3306 {
 delay_loop 2
 #lb_algo rr              #LVS算法，用不到，我们就关闭了
 #lb_kind DR              #LVS模式，如果不关闭，备用服务器不能通过VIP连接主MySQL 
 persistence_timeout 50  #同一IP的连接60秒内被分配到同一台真实服务器
 protocol TCP
 real_server 172.16.1.101 3306 {  #检测本地mysql，backup也要写检测本地mysql
 weight 3
 notify_down /usr/local/keepalived/mysql.sh    #当mysq服down时，执行此脚本，杀死
keepalived实现切换
 TCP_CHECK {
 connect_timeout 3    #连接超时
 nb_get_retry 3      #重试次数
 delay_before_retry 3 #重试间隔时间
  }
}
"/etc/keepalived/keepalived.conf" 40L, 1292C written
[root@db2 ~]# vim /etc/keepalived/keepalived.conf 
 auth_type PASS
 auth_pass 1111
 }
 virtual_ipaddress {
 172.16.1.99
 }
}
virtual_server 172.16.1.99 3306 {
 delay_loop 2
 #lb_algo rr              #LVS算法，用不到，我们就关闭了
 #lb_kind DR              #LVS模式，如果不关闭，备用服务器不能通过VIP连接主MySQL 
 persistence_timeout 50  #同一IP的连接60秒内被分配到同一台真实服务器
 protocol TCP
 real_server 172.16.1.101 3306 {  #检测本地mysql，backup也要写检测本地mysql
 weight 3
 notify_down /usr/local/keepalived/mysql.sh    #当mysq服down时，执行此脚本，杀死
keepalived实现切换
 TCP_CHECK {
 connect_timeout 3    #连接超时
 nb_get_retry 3      #重试次数
 delay_before_retry 3 #重试间隔时间
  }
}