软件版本：Keepalived v1.3.4 (02/18,2017)，Apache/2.2.15

系统版本：centos 6.6

master：10.10.24.21    backup：10.10.4.11

vip：10.10.24.253

因为主要是介绍keepalived，所以apache采用yum版本安装

keepalive采用的是源码安装，安装过程如下

keepalived下载地址是：http://www.keepalived.org/download.html

tar -zxf keepalived-1.3.4.tar.gz

cd keepalived-1.3.4

./configure

make && make install

其实就安装配置挺简单

下面是本地脚本，一个是服务检测脚本，一个是mail报警邮件

[root@VIDEt-tes01 keepalived]# cat check_httpd.sh
#!/bin/bashwc=`ss -ln |grep ":80 " |wc -l` #判断本地的80端口是否开启
if [ $wc -eq 1 ]
then
exit 0   #如果存在就发出0的信号
else
exit 1  #如果不存在就发出1的信号
fi
#其实这个可以根据自己的情况自定义，就是keepalived是根据你脚本返回的状态码，来判断服务是否正常

[root@VIDEt-tes01 keepalived]# cat mail.sh  #邮件报警脚本
#!/bin/bash
fmail=keepalived@xxxxxx.com.cn #发件人地址
tmail=zhangsan@xxxxxxx.com.cn #收件人地址
smail=mail.xxxxxxxx.com.cn  #邮件服务器地址,smtp
ip=`ifconfig eth0 |awk -F "[ :]+" 'NR==2{print $4}'`
/usr/local/bin/sendEmail -f $fmail -t $tmail -s $smail -u "keepalive-$ip" -o message-charset=utf8 -m "$ip 目前是否正在提供服务: $1"

我没有使用keepalived自带的发邮件功能，用的是sendEmail，平常工作中都用的sendEmail

master这边的配置项：

[root@wam keepalived]# cat keepalived.conf
! Configuration File for keepalivedglobal_defs {notification_email {root@localhost}notification_email_from root@localhostsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL
}
vrrp_script chk_httpd {script "/etc/keepalived/check_httpd.sh"interval 5weight 2fall 4rise 4}vrrp_instance VI_1 {state MASTERinterface eth0virtual_router_id 51priority 99advert_int 1authentication {auth_type PASSauth_pass a23c7f32dfb519d6a5dc67a4b2ff8f5e}track_interface {eth0
}virtual_ipaddress {10.10.4.253 dev eth0 label eth0:0}
track_script {chk_httpd}
notify_backup "/etc/keepalived/mail.sh NO"
notify_master "/etc/keepalived/mail.sh YES"
}
启动服务：
keepalived -f /etc/keepalived/keepalived.conf

slave这边的配置项：

[root@VIDEt-tes01 keepalived]# vim keepalived.conf smtp_connect_timeout 30router_id LVS_DEVEL
}
vrrp_script chk_httpd {script "/etc/keepalived/check_httpd.sh"interval 1weight 2}vrrp_instance VI_1 {state BACKUPinterface eth0virtual_router_id 51priority 98advert_int 1authentication {auth_type PASSauth_pass a23c7f32dfb519d6a5dc67a4b2ff8f5e}track_interface {eth0
}virtual_ipaddress {10.10.4.253 dev eth0 label eth0:0}
track_script {chk_httpd}
notify_backup "/etc/keepalived/mail.sh NO"
notify_master "/etc/keepalived/mail.sh YES"
}
启动服务：
keepalived -f /etc/keepalived/keepalived.conf

试验效果：

关闭master上面的服务：

[root@wam keepalived]# /etc/init.d/httpd stop

Stopping httpd:                                            [  OK  ]

[root@wam keepalived]#

日志：

###因为我设置的是fall 4，是失败4次之后才任务失败

Mar  3 14:22:26 wam Keepalived_vrrp[40562]: pid 53178 exited with status 1

Mar  3 14:22:31 wam Keepalived_vrrp[40562]: pid 53188 exited with status 1

Mar  3 14:22:36 wam Keepalived_vrrp[40562]: pid 53196 exited with status 1

Mar  3 14:22:41 wam Keepalived_vrrp[40562]: pid 53206 exited with status 1

Mar  3 14:22:41 wam Keepalived_vrrp[40562]: VRRP_Script(chk_httpd) failed

Mar  3 14:22:42 wam Keepalived_vrrp[40562]: VRRP_Instance(VI_1) Changing effective priority from 101 to 99

Mar  3 14:22:43 wam Keepalived_vrrp[40562]: VRRP_Instance(VI_1) Received advert with higher priority 100, ours 99

Mar  3 14:22:43 wam Keepalived_vrrp[40562]: VRRP_Instance(VI_1) Entering BACKUP STATE

Mar  3 14:22:45 wam ntpd[5879]: Deleting interface #15 eth0:0, 10.10.4.253#123, interface stats: received=0, sent=0, dropped=0, active_time=5681 secs

slave上面的效果：

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000

link/ether 00:50:56:97:70:3e brd ff:ff:ff:ff:ff:ff

inet 10.10.4.11/24 brd 10.10.4.255 scope global eth0

inet 10.10.4.253/32 scope global eth0:0

inet6 fe80::250:56ff:fe97:703e/64 scope link

valid_lft forever preferred_lft forever