<--目录-->
1）安装LVS和Keepalived
2）lvs脚文内容
3）keepalived配置文件内容
【安装LVS和Keepalived】
#安装lvs工具
yum -y install ipvsadm
#安装keepalived
yum -y install gcc kernel-devel openssl-devel popt-devel
tar zxf keepalived-1.2.13.tar.gz
cd keepalived-1.2.13
./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/
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/
chkconfig --add keepalived
chkconfig keepalived on
#更换keepalived文件
#lvs 更换keepalived配置文件即可，换配置文件后还需更改虚拟IP
#更换web服务器文件（法1）
#在两台需要负载均衡的web服务器更换sysctl.conf,添加ifcfg-lo:0,添加ifcfg-lo:0后还需更改虚拟IP，或直接添加lvs这个脚本亦可
#更换web服务器文件（法2）
#1）在两台需要负载均衡的web服务器/opt目录下直接添加lvs这个脚本即可
#2）设置开机启动
tail -1 /etc/rc.local
/opt/lvs start
#5）测试轮询访问
#for((i=1;i<11;i++));do curl http://虚拟IP;echo $i;sleep 2;echo; done
#注意：
#1、如lvs出现裂脑情况，则可能是防火墙、selinux没关，网络关闭了
#2、发现设置了DR模式，rr轮询的调度算法，但访问刷新还是访问同一台web，那是因为设置了会话保持时间，把#他注释掉即可
【lvs脚文内容】
#!/bin/bash
# Written by NetSeek
# description: Config realserver lo and apply noarp
WEB_VIP=192.168.2.100 #此处改为你设定的vip地址
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $WEB_VIP netmask 255.255.255.255 broadcast $WEB_VIP
/sbin/route add -host $WEB_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 $WEB_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"
;;
status)
# Status of LVS-DR real server.
islothere=`/sbin/ifconfig lo:0 | grep $WEB_VIP`
isrothere=`netstat -rn | grep "lo:0" | grep $web_VIP`
if [ ! "$islothere" -o ! "isrothere" ];then
# Either the route or the lo:0 device
# not found.
echo "LVS-DR real server Stopped."
else
echo "LVS-DR Running."
fi
;;
*)
# Invalid entry.
echo "$0: Usage: $0 {start|status|stop}"
exit 1
;;
esac
exit 0
【keepalived配置文件内容】
! Configuration File for keepalived
global_defs {
notification_email {
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER #主为MASTER，备为BACKUP
interface eth0
virtual_router_id 51
priority 100 #主的优先级比较高，主为100，备为90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.2.100
}
}
virtual_server 192.168.2.100 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
#persistence_timeout 10
protocol TCP
real_server 192.168.2.3 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.2.4 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
virtual_server 192.168.2.100 443 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
#persistence_timeout 10
protocol TCP
real_server 192.168.2.3 443 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.2.4 443 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}