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 [email protected] #发件人地址 [email protected] #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 keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from root@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_httpd {
script "/etc/keepalived/check_httpd.sh"
interval 5
weight 2
fall 4
rise 4
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_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 30
router_id LVS_DEVEL
}
vrrp_script chk_httpd {
script "/etc/keepalived/check_httpd.sh"
interval 1
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 98
advert_int 1
authentication {
auth_type PASS
auth_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:
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