keepalived 结合mysql 自动切换

启动keepalived:/usr/local/sbin/keepalived -D -d -S 0

master ip:192.168.32.6

master:/root/sbin# cat /etc/keepalived/keepalived.conf
global_defs {
   router_id MySQL-ha
}

vrrp_instance VI_1{
# 在初始化状态下定义为主设备
state BACKUP
# 注意网卡接口
interface eth1
virtual_router_id 71
# 优先级，另一台改为90
priority 100
advert_int 1
# 不主动抢占资源
nopreempt
authentication {
# 认证方式，可以是PASS或AH两种认证方式
auth_type PASS
# 认证密码
auth_pass 1111
}

virtual_ipaddress {
# 虚拟IP地址，随着state的变化而增加删除
192.168.32.66
}
}

virtual_server 192.168.32.66 3306 {
# 每个2秒检查一次real_server状态
delay_loop 2
# LVS算法
lb_algo wrr
# LVS模式
lb_kind DR
# 会话保持时间
persistence_timeout 60
protocol TCP

real_server 192.168.32.6 3306 {
# 权重
weight 3
# 检测到服务down后执行的脚本
notify_down /etc/keepalived/keepalived.sh
TCP_CHECK {
# 连接超时时间
connect_timeout 10
# 重连次数
nb_get_retry 3
# 重连间隔时间
delay_before_retry 3
# 健康检查端口
connect_port 3306
}
}
}

slave ip： 192.168.32.116

slave:/root/sbin# cat /etc/keepalived/keepalived.conf
global_defs {
   router_id MySQL-ha
}

vrrp_instance VI_1{
# 在初始化状态下定义为主设备
state BACKUP
# 注意网卡接口
interface eth1
virtual_router_id 71
# 优先级，另一台改为90
priority 90
advert_int 1
# 不主动抢占资源
nopreempt
authentication {
# 认证方式，可以是PASS或AH两种认证方式
auth_type PASS
# 认证密码
auth_pass 1111
}

virtual_ipaddress {
# 虚拟IP地址，随着state的变化而增加删除
192.168.32.66
}
}

virtual_server 192.168.32.66 3306 {
# 每个2秒检查一次real_server状态
delay_loop 2
# LVS算法
lb_algo wrr
# LVS模式
lb_kind DR
# 会话保持时间
persistence_timeout 60
protocol TCP

real_server 192.168.32.116 3306 {
# 权重
weight 3
# 检测到服务down后执行的脚本
notify_down /etc/keepalived/keepalived.sh
TCP_CHECK {
# 连接超时时间
connect_timeout 10
# 重连次数
nb_get_retry 3
# 重连间隔时间
delay_before_retry 3
# 健康检查端口
connect_port 3306
}
}
}

mysql 主从切换；

master:

test:/root/sbin# ps -ef | grep mysql
root     29199     1  0 22:31 pts/0    00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/data01/mysql --pid-file=/data01/mysql/test.pid
mysql    29531 29199  0 22:31 pts/0    00:00:01 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data01/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/var/log/mysql/mysqld.log --pid-file=/data01/mysql/test.pid --socket=/data01/mysql/mysql.sock
root     29597 27487  0 22:34 pts/0    00:00:00 grep mysql
test:/root/sbin# ps -ef | grep keep
root     29573     1  0 22:31 ?        00:00:00 /usr/local/sbin/keepalived -D -d -S 0
root     29574 29573  0 22:31 ?        00:00:00 /usr/local/sbin/keepalived -D -d -S 0
root     29575 29573  0 22:31 ?        00:00:00 /usr/local/sbin/keepalived -D -d -S 0
root     29599 27487  0 22:34 pts/0    00:00:00 grep keep
test:/root/sbin# ip add | grep inet
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
    inet 192.168.32.6/24 brd 192.168.32.255 scope global eth1
    inet 192.168.32.66/32 scope global eth1
    inet6 8001::20c:29ff:febf:dce8/64 scope global dynamic
    inet6 fe80::20c:29ff:febf:dce8/64 scope link 

slave:

slave:/root# ps -ef | grep mysql
root      9083     1  0 22:34 pts/1    00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/data01/mysql --pid-file=/var/run/mysqld/mysqld.pid
mysql     9451  9083  4 22:34 pts/1    00:00:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data01/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/var/log/mysql/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/data01/mysql/mysql.sock
root      9493  5676  0 22:34 pts/1    00:00:00 grep mysql
slave:/root# ps -ef | grep keep
root      7928  7907  0 22:23 pts/0    00:00:00 tail -f /var/log/keepalived/keepalived.log
root      9485     1  0 22:34 ?        00:00:00 /usr/local/sbin/keepalived -D -d -S 0
root      9486  9485  0 22:34 ?        00:00:00 /usr/local/sbin/keepalived -D -d -S 0
root      9487  9485  0 22:34 ?        00:00:00 /usr/local/sbin/keepalived -D -d -S 0
root      9514  5676  0 22:35 pts/1    00:00:00 grep keep
slave:/root# ip add | grep inet
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
    inet 192.168.32.116/24 brd 192.168.32.255 scope global eth1
    inet6 8001::20c:29ff:fec2:2682/64 scope global dynamic
    inet6 fe80::20c:29ff:fec2:2682/64 scope link 

master 停掉数据库后:
test:/root/sbin# service mysql stop
Shutting down MySQL...                                     [  OK  ]
You have mail in /var/spool/mail/root
test:/root/sbin# ip add | grep inet
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
    inet 192.168.32.6/24 brd 192.168.32.255 scope global eth1
    inet6 8001::20c:29ff:febf:dce8/64 scope global dynamic
    inet6 fe80::20c:29ff:febf:dce8/64 scope link
test:/root/sbin# ps -ef | grep mysql
root     29676 27487  0 22:36 pts/0    00:00:00 grep mysql
test:/root/sbin# ps -ef | grep keep
root     29678 27487  0 22:36 pts/0    00:00:00 grep keep

slave上:

slave:/root# ip add | grep inet
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
    inet 192.168.32.116/24 brd 192.168.32.255 scope global eth1
    inet 192.168.32.66/32 scope global eth1
    inet6 8001::20c:29ff:fec2:2682/64 scope global dynamic
    inet6 fe80::20c:29ff:fec2:2682/64 scope link 

此时地址过来了:

当监测到端口down后执行的脚本；
slave:/root/sbin# cat /etc/keepalived/keepalived.sh
. ~/.bash_profile
pkill keepalived
perl /root/sbin/smail.pl

keepalived 监测到3306 mysql服务后；
Jul 16 22:02:12 slave Keepalived_healthcheckers[5816]: TCP connection to [192.168.32.116]:3306 success.
Jul 16 22:02:12 slave Keepalived_healthcheckers[5816]: Adding service [192.168.32.116]:3306 to VS [192.168.32.66]:3306
Jul 16 22:02:12 slave Keepalived_healthcheckers[5816]: Gained quorum 1+0=1 <= 3 for VS [192.168.32.66]:3306

关闭Mysql:

Jul 16 22:03:00 slave Keepalived_healthcheckers[5816]: TCP connection to [192.168.32.116]:3306 failed !!!
Jul 16 22:03:00 slave Keepalived_healthcheckers[5816]: Removing service [192.168.32.116]:3306 from VS [192.168.32.66]:3306
Jul 16 22:03:00 slave Keepalived_healthcheckers[5816]: Executing [/etc/keepalived/keepalived.sh] for service [192.168.32.116]:3306 in VS [192.168.32.66]:3306
Jul 16 22:03:00 slave Keepalived_healthcheckers[5816]: Lost quorum 1-0=1 > 0 for VS [192.168.32.66]:3306