cd /root/install

wget http://www.keepalived.org/software/keepalived-1.2.9.tar.gz

tar -zxvf keepalived-1.2.9.tar.gz

cd keepalived-1.2.9

./configure –prefix=/usr/local/keepalive

make && make install

使用 主备 检测 并 不抢占

参考url  http://duyunlong.blog.51cto.com/1054716/1310405

 ! Configuration File for keepalived
global_defs {
router_id topcmm.net
}
vrrp_script check_run {
             script “/root/1.sh”

#监控脚本
       interval 5
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 88
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass topcmm.net
}
    #     track_script {
#       check_run
#   }                              

        virtual_ipaddress {
192.168.100.11
}
}
virtual_server  192.168.100.11 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.0.0
persistence_timeout 50
protocol TCP    real_server 192.168.0.86 80 {
weight 1
        notify_down /root/mysql.sh

#检测脚本 如果后端检测失败，会执行上面的命令
        HTTP_GET {
url {
path /1
digest db0aa8bee7afe5a6e363ddcd890e9743
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}}

备机

  ! Configuration File for keepalived
global_defs {
router_id topcmm.net
}
vrrp_script check_run {
script “/root/1.sh”
interval 5
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 88
priority 80
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass topcmm.net
}

    #  track_script {
#      check_run
# }
virtual_ipaddress {
192.168.100.11
}
}
virtual_server  192.168.100.11 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.0.0
persistence_timeout 50
protocol TCP    real_server 192.168.0.88 80 {
weight 1
              notify_down /root/mysql.sh
        HTTP_GET {
url {
path /1
digest 9e01624ab7743bcdbd8cb31681392cd5
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}

}

实现切换有2种方式

1:一种是通keepalived的检测，这种方式的好处是:可以自己写监控脚本,出问题的时候keepalived的进程不会挂掉.同时我们设置不抢占,除非keepalived被人为的重启,否则的话永远都不会主的会自动切回。

2：一种是通过keepalived的后端检测，这种方式的好处是可以使用keepalive定义的一些后端检测。而且出问题可以调用脚本，我参考的文章是这种方式，不过他采用的是出问题杀进程的方法，所以出问题的keepalived会被杀掉，重启的时候会自动切换回去。

通过考虑，还是觉得第一种方式比较适合。后面的配置可以忽略不写。但是监控脚本一定要确保没问题。

优化之后的配置

主的

  ! Configuration File for keepalived
global_defs {
router_id topcmm.net
}
vrrp_script check_run {
# script “/root/1.sh”
script “echo ‘n’ | telnet 127.0.0.1 3307 | grep Connected”
interval 5
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 88
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass shanliao.com
}
track_script {
check_run
}
virtual_ipaddress {
192.168.0.11
}
}

备的

   ! Configuration File for keepalived
global_defs {
router_id topcmm.net
}
vrrp_script check_run {
# script “/root/1.sh”
script “echo ‘n’ | telnet 127.0.0.1 3307 | grep Connected”
interval 5
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 88
priority 80
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass shanliao.com
}

track_script {
check_run
}
virtual_ipaddress {
192.168.0.11
}
}