介绍
环境
OS:CentOS 6.7,MySQL 5.6
Master:192.168.137.10 hosts:master
Backup:192.168.137.20 hosts:slave
VIP:192.168.137.50
Master配置
修改cnf配置文件：
server_id =10 log_bin=/usr/local/mysql/data/mysql_bin max_binlog_size = 1G binlog_format=MIXED #binlog-do-db= binlog-ignore-db=test #这里记住不要加入系统数据库，多个数据库以逗号隔开 #replicate-do-db= replicate-ignore-db=test log-slave-updates slave-skip-errors=all auto_increment_increment=2 auto_increment_offset=1
重启mysql
Service mysql restart
查看binglog位置
SHOW MASTER STATUS
由于是刚创建默认是：mysql_bin.000001:120
创建复制用户：
mysql –uroot -proot
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.80.%' IDENTIFIED BY 'repl';
flush privileges; change master to master_host = '192.168.137.20', master_user = 'repl', master_password = 'repl', master_log_file = 'mysql_bin.000001', #注意binlog的命名 master_log_pos = 120;
启动复制，先在132上创建完复制用户再执行
start slave;
Backup配置
server_id =20 log_bin=/usr/local/mysql/data/mysql_bin max_binlog_size = 1G binlog_format=MIXED #binlog-do-db= binlog-ignore-db=test #replicate-do-db= replicate-ignore-db=test #这里记住不要加入系统数据库，多个数据库以逗号隔开 log-slave-updates slave-skip-errors=all auto_increment_increment=2 auto_increment_offset=2
重启mysql
Service mysql restart
查看binglog位置
SHOW MASTER STATUS
由于是刚创建默认是：mysql_bin.000001:120
创建复制用户：mysql –uroot -proot
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.80.%' IDENTIFIED BY 'repl';
flush privileges; change master to master_host = '192.168.137.10', master_user = 'repl', master_password = 'repl', master_log_file = 'mysql-bin.000001', #注意binlog的命名 master_log_pos = 120;
启动复制
start slave;
master keeplived安装配置
通过keeplived管理虚拟IP，并执行故障切换。
yum install openssl openssl-devel -y wget http://www.keepalived.org/software/keepalived-1.2.19.tar.gz tar -xvf keepalived-1.2.19.tar.gz cd keepalived-1.2.19 ./configure --prefix=/usr/local/keepalived make && make install
配置启动项
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ mkdir /etc/keepalived/ cp /usr/local/keepalived/sbin/keepalived /usr/bin/
keepalived配置
master
vim /etc/keepalived/keepalived.conf
#! Configuration File forkeepalived global_defs { notification_email { test@163.com } notification_email_from ha@163.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id MYSQL #组标识，双主相同 } vrrp_instance VI_1 { state BACKUP #两台都设置BACKUP interface eth0 virtual_router_id 51 #主备相同 priority 100 #优先级，backup设置120 master设置150 advert_int 1 nopreempt #不主动抢占资源，两台都设置 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.137.50 #虚拟IP } } virtual_server 192.168.137.50 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 192.168.137.10 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 } } }
backup
vim /etc/keepalived/keepalived.conf
#! Configuration File forkeepalived global_defs { notification_email { test@163.com } notification_email_from ha@163.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id MYSQL #组标识，双主相同 } vrrp_instance VI_1 { state BACKUP #两台都设置BACKUP interface eth0 virtual_router_id 51 #主备相同 priority 90 #优先级，backup设置120 master设置150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.137.50 } } virtual_server 192.168.137.50 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 192.168.137.20 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 } } }
注意：nopreempt（不主动抢占）针对优先级高的一方是有效的；如果不使用 nopreempt 那么优先级高的服务器每次重启都会把VIP抢占过去，这样会导致VIP频繁切换。正常情况下VIP切换到了哪一台服务器就把那台作为主不需要再抢占回去，目前测试nopreempt针对优先级低的一方没有效果，优先级低的不加上该参数也不会把优先级高的VIP抢占走。
将keepalived加入系统启动项
chkconfig --add keepalived
chkconfig keepalived on
vim /usr/local/keepalived/mysql.sh
#!/bin/bash
pkill keepalived
修改文件可执行权限
chmod +x /usr/local/keepalived/mysql.sh
启动Keepalived
service keepalived start
查看VIP状态
ip add
注意：在文件配置中使用备注千万要注意，要确保你的备注被识别为备注，之前就遇到过这样的问题在代码后使用#备注由于#和实际的代码挨在一起被程序当成了代码导致整个配置出现了问题，特别是这种问题很难找，所以代码中使用备注千万要小心。
总结
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