时间：2021-07-01 10:21:17 帮助过：81人阅读
关于MySQL-HA，目前有多种解决方案，比如heartbeat、drbd、mmm、共享存储，但是它们各有优缺点。heartbeat、drbd配置较为复杂，需要自己写脚本才能实现MySQL自动切换，对于不会脚本语言的人来说，这无疑是一种脑裂问题;对于mmm，生产环境中很少有人用，且mmm 管理端需要单独运行一台服务器上，要是想实现高可用，就得对mmm管理端做HA，这样无疑又增加了硬件开支;对于共享存储，个人觉得MySQL数据还是放在本地较为安全，存储设备毕竟存在单点隐患。使用MySQL双master+keepalived是一种非常好的解决方案，在MySQL-HA环境中，MySQL互为主从关系，这样就保证了两台MySQL数据的一致性，然后用keepalived实现虚拟IP，通过keepalived自带的服务监控功能来实现MySQL故障时自动切换。
下面，我把即将上线的一个生产环境中的架构与大家分享一下，看一下这个架构中，MySQL-HA是如何实现的，环境拓扑如下
- MySQL-VIP：192.168.1.200
- MySQL-master1：192.168.1.201
- MySQL-master2：192.168.1.202
- OS版本：CentOS 5.4
- MySQL版本：5.0.89
- Keepalived版本：1.1.20
一、MySQL master-master配置
1、修改MySQL配置文件
两台MySQL均如要开启binlog日志功能，开启方法：在MySQL配置文件[MySQLd]段中加上log-bin=MySQL-bin选项
两台MySQL的server-ID不能一样，默认情况下两台MySQL的serverID都是1，需将其中一台修改为2即可
2、将192.168.1.201设为192.168.1.202的主服务器
在192.168.1.201上新建授权用户
- MySQL> grant replication slave on *.* to 'replication'@'%' identified by 'replication';
- Query OK, 0 rows affected (0.00 sec)
- MySQL> show master status;
- +------------------+----------+--------------+------------------+
- | File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
- +------------------+----------+--------------+------------------+
- | MySQL-bin.000003 | 374 | | |
- +------------------+----------+--------------+------------------+
- 1 row in set (0.00 sec)
在192.168.1.202上将192.168.1.201设为自己的主服务器
- MySQL> change master to master_host='192.168.1.201',master_user='replication',master_password='replication',master_log_file='MySQL-bin.000003',master_log_pos=374;
- Query OK, 0 rows affected (0.05 sec)
- MySQL> start slave;
- Query OK, 0 rows affected (0.00 sec)
- MySQL> show slave status/G
- *************************** 1. row ***************************
- Slave_IO_State: Waiting for master to send event
- Master_Host: 192.168.1.201
- Master_User: replication
- Master_Port: 3306
- Connect_Retry: 60
- Master_Log_File: MySQL-bin.000003
- Read_Master_Log_Pos: 374
- Relay_Log_File: MySQL-master2-relay-bin.000002
- Relay_Log_Pos: 235
- Relay_Master_Log_File: MySQL-bin.000003
- 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: 374
- 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 (0.00 sec)
3、将192.168.1.202设为192.168.1.201的主服务器
在192.168.1.202上新建授权用户
- MySQL> grant replication slave on *.* to 'replication'@'%' identified by 'replication';
- Query OK, 0 rows affected (0.00 sec)
- MySQL> show master status;
- +------------------+----------+--------------+------------------+
- | File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
- +------------------+----------+--------------+------------------+
- | MySQL-bin.000003 | 374 | | |
- +------------------+----------+--------------+------------------+
- 1 row in set (0.00 sec)
在192.168.1.201上，将192.168.1.202设为自己的主服务器
- MySQL> change master to master_host='192.168.1.202',master_user='replication',master_password='replication',master_log_file='MySQL-bin.000003',master_log_pos=374;
- Query OK, 0 rows affected (0.05 sec)
- MySQL> start slave;
- Query OK, 0 rows affected (0.00 sec)
- MySQL> show slave status/G
- *************************** 1. row ***************************
- Slave_IO_State: Waiting for master to send event
- Master_Host: 192.168.1.202
- Master_User: replication
- Master_Port: 3306
- Connect_Retry: 60
- Master_Log_File: MySQL-bin.000003
- Read_Master_Log_Pos: 374
- Relay_Log_File: MySQL-master1-relay-bin.000002
- Relay_Log_Pos: 235
- Relay_Master_Log_File: MySQL-bin.000003
- 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: 374
- 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 (0.00 sec)
4、MySQL同步测试
如上述均正确配置，现在任何一台MySQL上更新数据都会同步到另一台MySQL，MySQL同步在此不再演示