keepalived + nginx 心跳检测

! Configuration File for keepalived
global_defs {
}
vrrp_script chk_nginx {
script "/etc/keepalived/check.sh"
interval 1
weight -15
}
vrrp_instance VI_1 {  #  实例，一个vip一个实例
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
 auth_type PASS
 auth_pass 123456
}
virtual_ipaddress {
 192.168.8.201
}
track_script {
 chk_nginx
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}

! Configuration File for keepalived
global_defs {
}
vrrp_script chk_nginx {
script "/etc/keepalived/check.sh"
interval 1
weight -15
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99
advert_int 1
authentication {
 auth_type PASS
 auth_pass 123456
}
virtual_ipaddress {
 192.168.8.201
}
track_script {
 chk_nginx
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}

#!/bin/bash
# 心跳检测：如果服务还在运行返回0，否则返回1
if [ "`pgrep  nginx  |  wc  -l`" == "0" ] ; then
exit 1
else
exit 0
fi

#!/bin/bash
# 通知脚本：具体操作
if [ "$1" == "master" ] ; then
echo "`date '+%F %T'`：切换到主机模式" >> /var/log/keepalived/keepalived.log
elif [ "$1" == "backup" ] ; then
/usr/bin/systemctl start nginx
echo "`date '+%F %T'`：切换到备机模式" >> /var/log/keepalived/keepalived.log
else
/usr/bin/systemctl start nginx
echo "`date '+%F %T'`：宕机" >> /var/log/keepalived/keepalived.log
fi

chmod  +x  /etc/keepalived/check.sh
chmod  +x  /etc/keepalived/notify.sh