[软件安装]yum install -y keepalived
rpm -qa keepalivedLB01配置文件
[root@LB_01 ~]# cat /etc/keepalived/keepalived.conf!Configuration file for keepalivedglobal_defs {notification_email {845330082@qq.ocm}notification_email_from Lufeng.lufeng@firewall.locsmtp_server 127.0.0.1smtp_connect_timeout 30router_id lb01
}vrrp_script chk_nginx_proxy {
script "/home/lufeng/tools/chk_nginx_proxy.sh"interval 2
weight 2
}vrrp_instance VI_BBS {state MASTERinterface eth0virtual_router_id 55priority 150advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.1.1.45/24 dev eth0 label eth0:1}track_script {chk_nginx_proxy}
}
vrrp_instance VI_WWW {state BACKUPinterface eth0virtual_router_id 56priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.1.1.46/24 dev eth0 label eth0:2}
}LB02配置文件[root@LB_02 tools]# cat /etc/keepalived/keepalived.conf
!Configuration file for keepalivedglobal_defs {notification_email {845330082@qq.ocm}notification_email_from Lufeng.lufeng@firewall.locsmtp_server 127.0.0.1smtp_connect_timeout 30router_id lb02
}vrrp_instance VI_BBS {state BACKUPinterface eth0virtual_router_id 55priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.1.1.45/24 dev eth0 label eth0:1}
}vrrp_script chk_nginx_proxy {
script "/home/lufeng/tools/chk_nginx_proxy.sh"interval 2
weight 2
}vrrp_instance VI_WWW {state MASTERinterface eth0virtual_router_id 56priority 150advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.1.1.46/24 dev eth0 label eth0:2}track_script {chk_nginx_proxy}
}检查nginx脚本：
[root@LB_02 tools]# cat /home/lufeng/tools/chk_nginx_proxy.sh
#!/bin/sh
if [ `netstat -lntup|grep nginx|wc -l` -ne  1 ];then/etc/init.d/keepalived stop
fi记得加上执行权限：
[root@LB_02 tools]# chmod +x /home/lufeng/tools/chk_nginx_proxy.sh 补充VIP添加及查看方式：设置网卡的ip别名
#ifconfig eth0:0 192.168.6.100 netmask 255.255.255.0 up
#ifconfig eth0:1 173.173.173.173 netmask 255.255.255.0 up
#ifconfig eth0:2 119.110.120.1 netmask 255.255.255.0 up
先进命令：
#ip addr add 192.168.0.118/24 dev eth0
查看
#ip add|grep 192.168.0清除ip别名
#ifconfg eth0:0 down
#ifconfg eth0:1 down
#ifconfg eth0:2 down ......将别名保存到配置文件：
方法1：
1.将增加ip别名的命令填写到/etc/rc.local文件中 即将所有如这样ifconfig eth0:0 192.168.6.100 netmask 255.255.255.0 up的命令一行行全部填写到rc.local文件中去，rc.local文件是作用于linux开机自动执行命令，详细用法g或b一下，这里不详细说明。 这个方法最方便，但不太可靠，有时会失灵。方法2：
#vi ifcfg-eth0:0
创建eth0:0的配置文件，并将刚才复制的字段粘贴到这个配置文件，按照下文的介绍修改部分信息，修改完成后保存退出  以下是网卡配置文件的部分信息说明，其他类似信息默认即可：
##############################################################################
# 3Com Corporation 3c905B 100BaseTX [Cyclone]??? //硬件型号，忽略不计
DEVICE=eth0:0???????????????? //虚拟网络接口，随意???????????????????????????????????? ONBOOT=yes??????????????????? //系统启动时激活
BOOTPROTO=static?? ??? ????? //使用静态ip地址????????????????
IPADDR=192.168.6.100????????? //该虚拟网络接口的ip别名，随意
NETMASK=255.255.255.0???????? //子网掩码，对应ip别名
GATEWAY=192.168.6.1?????????? //网关，对应ip别名
HWADDR=00:10:5A:5E:B1:E4????? //网卡MAC地址，无需更改???????????????????
USERCTL=no??????????????????? //是否给予非root用户设备管理权限  ##############################################################################设置必要开机自启动：
[root@LB_02 tools]# echo "/application/nginx/sbin/nginx">>/etc/rc.local
[root@LB_02 tools]# echo "/etc/init.d/keepalived start">>/etc/rc.local
[root@LB_02 tools]# cat /etc/rc.local
#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.touch /var/lock/subsys/local
/application/nginx/sbin/nginx
/etc/init.d/keepalived start