MySQL 主主复制
OS:CentOS 6.7,MySQL 5.6
Master:192.168.80.129 hosts:master
Backup:192.168.80.132 hosts:slave
VIP:192.168.80.133
Master配置
修改129的cnf配置文件：
server_id =129
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 = '192.168.80.132',
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 =132
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 = '192.168.80.129',
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/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
vim /etc/keepalived/keepalived.conf
! Configuration File forkeepalived
global_defs {
notification_email {
}
notification_email_from [email protected]
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 150 #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 {
192.168.80.133 #虚拟IP
}
}
virtual_server 192.168.80.133 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 192.168.80.129 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
}
}
}
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
service keepalived stop
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
backup keepalived配置
只需要修改keepalived.conf的红色项就可以
问题：1.当master和backup都配置成“state BACKUP”无论怎样修改“nopreempt ”哪个keeplived重启，VIP就跳到哪个keeplived上了。
2.使用workbench连接VIP隔断时间就会自动中断，其它的客户端不会
3.如果master配置成了“state MASTER”当现在的VIP是backup隔段时间会被master抢占了VIP，master配置不配置“nopreempt ”都一样。
4.如果不加上“notify_down /usr/local/keepalived/mysql.sh”这个结束keepalived操作，如果不配置“nopreempt ”当一台宕机了另一台需要间隔10几分钟才会抢占VIP，如果配置了“nopreempt ”无论优先级高低都不会抢占VIP过来，所以这个步骤还是必须的。
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