keeplived Configuration Nginx Dual Machine High Availability

First, Introduction
Whether it is keepalived or heartbeat do high availability, its high availability, are standing in the server script to say the high availability, rather than the angle of the service.
In other words, if the server down or network failure, high availability can be achieved automatically switch. If the service is running, such as nginx hanging off
These high-availability software is not aware of, need to write their own scripts to implement the service switch.

Second, installation configuration keepalived copy content to clipboard Code:#./configure
# make
# make Install
# cp/usr/local/etc/rc.d/init.d/keepalived/etc/rc.d/init.d/
# cp/usr/local/etc/sysconfig/keepalived/etc/sysconfig/
# cp/usr/local/sbin/keepalived/usr/bin/
# chkconfig--add keepalived
# mkdir/etc/keepalived/
# cp/usr/local/etc/keepalived/keepalived.conf/etc/keepalived/Edit Master's main profile (master:1.1.1.1) copy content to clipboard Code:# vim/etc/keepalived/keepalived.conf

! Configuration File for Keepalived

Global_defs {
router_id Lvs_devel
}
Vrrp_script Chk_nginx {
Script "/opt/monnginx.sh"
Interval 2
Weight 2
}

Vrrp_instance Vi_1 {
State MASTER
Interface eth0
VIRTUAL_ROUTER_ID 51
Priority 100
Advert_int 1
Authentication {
Auth_type PASS
Auth_pass Mdnginx
}
virtual_ipaddress {
1.1.1.100
}
Track_script {
Chk_nginx
}
Edit BACKUP's Master profile (backup:1.1.1.2)
Copy Content to Clipboard Code:# vim/etc/keepalived/keepalived.conf

! Configuration File for Keepalived

Global_defs {
router_id Lvs_devel
}
Vrrp_script Chk_nginx {
Script "/opt/monnginx.sh"
Interval 2
Weight 2
}

Vrrp_instance Vi_1 {
State BACKUP
Interface eth0
VIRTUAL_ROUTER_ID 51
Priority 100
Advert_int 1
Authentication {
Auth_type PASS
Auth_pass Mdnginx
}
virtual_ipaddress {
1.1.1.100
}
Track_script {
Chk_nginx
}
Third, start service and scripting (both host and standby) copy content to clipboard Code:# service Nginx Start
# service keepalived Start write monitor nginx script copy content to clipboard Code:# vim/opt/monnginx.sh
#!/bin/bash
# Author:honway.liu
# date:2013-03-15

If [$ (ps-c nginx--no-header | wc-l)-EQ 0]; Then
Service Nginx Start
Fi
Sleep 3
If [$ (ps-c nginx--no-header | wc-l)-EQ 0]; Then
Service keepalived Stop
Fi improved script, plus alarm function. Copy Content to Clipboard Code:# vim/opt/monnginx.sh

#!/bin/bash
# Author:honway.liu
# date:2013-03-15
ipaddr=$ (IP addr show Eth0|awk ' {print $} ' | Sed-n 3p)
Contact= (137XXXXXXXX@139.com)
num=${#contact [@]}
function email () {
For ((i=0;i<num;i++));d o
echo "$IPADDR Service Problem" | Mail-s "WARNING" ${contact[i]}---F gm100861@gmail.com
Done
}

If [$ (ps-c nginx--no-header | wc-l)-EQ 0]; Then
Service Nginx Start
Fi
Email

Sleep 3

If [$ (ps-c nginx--no-header | wc-l)-EQ 0]; Then
Service keepalived Stop
Email
Fi here the alarm use is 139 mailbox, in 139 mailbox inside set up have mail, notify to mobile phone, and long letter way.
Need to account for the SendMail service of this machine.