下面是从网上看到的Mysql双主+keepalived实现HA的介绍，搭建双主是没有问题的，问题在于如果互为主从的一台机器如果挂掉了，并且另外一台机器的数据还不是从库中最新的，那么这个时候就会出问题。并且，两台互为主从的数据库二进制日志必须完全一致。要保证这一点，就必须在安装应用的时候都要规划好。 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 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) 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) 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) 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) 二、keepalived安装及配置 #tar zxvf keepalived-1.1.20.tar.gz #cd keepalived-1.1.20 #./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686 #make && make install #mkdir /etc/keepalived #vi /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { luwenju@live.cn } notification_email_from luwenju@live.cn smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id MySQL-ha } vrrp_instance VI_1 { state BACKUP #两台配置此处均是BACKUP interface eth0 virtual_router_id 51 priority 100 #优先级，另一台改为90 advert_int 1 nopreempt #不抢占，只在优先级高的机器上设置即可，优先级低的机器不设置 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.1.200 } } virtual_server 192.168.1.200 3306 { delay_loop 2 #每个2秒检查一次real_server状态 lb_algo wrr #LVS算法 lb_kind DR #LVS模式 persistence_timeout 60 #会话保持时间 protocol TCP real_server 192.168.1.201 3306 { weight 3 notify_down /usr/local/MySQL/bin/MySQL.sh #检测到服务down后执行的脚本 TCP_CHECK { connect_timeout 10 #连接超时时间 nb_get_retry 3 #重连次数 delay_before_retry 3 #重连间隔时间 connect_port 3306 #健康检查端口 } } #vi /usr/local/MySQL/bin/MySQL.sh #!/bin/sh pkill keepalived #chmod +x /usr/local/MySQL/bin/MySQL.sh #/usr/local/keepalived/sbin/keepalived –D #ps -aux | grep keepalived 测试 #tar zxvf keepalived-1.1.20.tar.gz #cd keepalived-1.1.20 #./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686 #make && make install #mkdir /etc/keepalived #vi /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { luwenju@live.cn } notification_email_from luwenju@live.cn smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id MySQL-ha } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.1.200 } } virtual_server 192.168.1.200 3306 { delay_loop 2 lb_algo wrr lb_kind DR persistence_timeout 60 protocol TCP real_server 192.168.1.202 3306 { weight 3 notify_down /usr/local/MySQL/bin/MySQL.sh TCP_CHECK { connect_timeout 10 nb_get_retry 3 delay_before_retry 3 connect_port 3306 } } #vi /usr/local/MySQL/bin/MySQL.sh #!/bin/sh pkill keepalived #chmod +x /usr/local/MySQL/bin/MySQL.sh 启动keepalived #/usr/local/keepalived/sbin/keepalived –D #ps -aux | grep keepalived 三、测试 MySQL> grant all privileges on *.* to 'root'@'%' identified by '123456'; Query OK, 0 rows affected (0.00 sec) MySQL> flush privileges; Query OK, 0 rows affected (0.00 sec) C:\MySQL\bin>MySQL.exe -uroot -p123456 -h192.168.1.200 -P3306 Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 224 Server version: 5.0.89-log Source distribution Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MySQL> MySQL> show databases; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 592 Current database: *** NONE *** +--------------------+ | Database | +--------------------+ | information_schema | | MySQL | | test | +--------------------+ 3 rows in set (9.01 sec)
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