Linux 下 LVS+Keepalived 负载均衡安装

lvs是一个开源的软件，由毕业于国防科技大学的章文嵩博士于1998年5月创立(中国人的项目)，可以实现LINUX平台下的简单负载均衡。

LVS是Linux Virtual Server的缩写，意思是Linux虚拟服务器。

负载均衡系统可以选用LVS方案，而为避免Director Server单点故障引起系统崩溃，我们可以选用LVS+Keepalived组合保证高可用性。

具体LVS作用是什么，这里就不详细说明。

直接执行命令（相应tar.gz文件自行下载）

#!/bin/sh
pathDir=$(cd `dirname $0`; pwd)
yum install -y libnl* popt*
yum -y install openssl-devel

cd ${pathDir}
tar -zxvf ipvsadm-1.26.tar.gz
make;make install

cd ${pathDir}
tar -zxvf keepalived-1.2.16.tar.gz
cd keepalived-1.2.16
./configure
make;make install
find / -name keepalived  # 查看keepalived位置                  
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/   
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/   
mkdir /etc/keepalived   
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/   
cp /usr/local/sbin/keepalived /usr/sbin/   
service keepalived status     #查看状态
#添加自启
chkconfig --add /etc/rc.d/init.d/keepalived
chkconfig keepalived on

#配置Web服务器的
#复制VIP.sh (修改虚拟IP地址)到/etc/rc.d/init.d
#cd /etc/rc.d/init.d/
#chmod 755  /etc/rc.d/init.d/functions 
#chmod 755  /etc/rc.d/init.d/VIP.sh
#bash /etc/rc.d/init.d/VIP.sh start

需要开机启动的VIP.sh，注意将SNS_VIP替换成自己的虚拟IP

#!/bin/bash

# description: Config realserver lo and apply noarp

 

SNS_VIP=192.168.2.219

 

/etc/rc.d/init.d/functions

 

case "$1" in

start)

       ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP

       /sbin/route add -host $SNS_VIP dev lo:0

       echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore

       echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce

       echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore

       echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

       sysctl -p >/dev/null 2>&1

       echo "RealServer Start OK"

 

       ;;

stop)

       ifconfig lo:0 down

       route del $SNS_VIP >/dev/null 2>&1

       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore

       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce

       echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

       echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

       echo "RealServer Stoped"

       ;;

*)

       echo "Usage: $0 {start|stop}"

       exit 1

esac