LVS——DR实例

#lvs 三种模式： NAT NAT模式
DR  直接路由
TUN 隧道模式

## lvs----架构，--
DR模式
 public---router------ld---（1，realserver01; 2,realserver 02)
 使用四台虚拟机实验，全部桥接，-----真实机器作为client实验

 client: 10.212.182.2 gw: 10.212.182.1
 router eth0: 10.212.182.1 ,eth1 : 10.212.183.1
 ld eth0: 10.212.183.2 eth0:0 10.212.183.3
 realserver01: 10.212.183.4 lo:0 10.212.183.3
 realserver02: 10.212.183.5  lo:0 10.212.183.3

 ---------------------------------------------
 client:
 ifconfig eth0 10.212.182.2
 route add default gw 10.212.182.1
 ----------------------
 router:
 ifconfig eth0 10.212.182.1 netmask 255.255.255.0 broadcast 10.212.182.255 up
  ifconfig eth1 10.212.183.1 netmask 255.255.255.0 broadcast 10.212.183.255 up
  开启包转发
echo 1 > /proc/sys/net/ipv4/ip_forward
---------------------------------------
ld:
ifconfig eth0 10.212.183.2 netmask 255.255.255.0 broadcast 10.212.183.255 up
ifconfig eth0:0 10.212.183.3 netmask 255.255.255.255 broadcast 10.212.183.3 up
同样开启包转发
echo 1 > /proc/sys/net/ipv4/ip_forward
先增加服务
ipvsadm -A -t 10.212.183.3:80 -s rr
-A 添加服务  -t 服务所使用的虚拟ip地址：端口 （虚拟地址工业环境应该是公网ip） -s 算法    (rr 算法就是你一个，我一个)

把这个服务和后面的server pool进行关联

ipvsadm -a -t 10.212.183.3:80 -r 10.212.183.4 -g
ipvsadm -a -t 10.212.183.3:80 -r 10.212.183.5 -g
-a  添加real server  -r real server的ip -g (DR模式)  -m是NAT模式

-----------------------------------
realserver01----------------------
所有realserver的配置脚本实现，当然首先需要安装httpd
#!/bin/bash
#written by booduklee
# time: 2011-06-27
# this is used to configure realserver in the lvs
echo "please mount your cd to /mnt\n"
YUM=/etc/yum.repos.d
VIP=10.212.183.3
ROUTE=10.212.183.1
mkdir /tmp/repo_bak
find $YUM -name "*.repo"  -exec mv {} /tmp/repo_bak \;
cat >> $YUM/server.repo << !
[base]
name=server
baseurl=file:///mnt/Server
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
!
yum clean all
yum install httpd -y
rm -rf $YUM/server.repo
mv /tmp/repo_bak/* $YUM
rm -rf /tmp/repo_bak
case "$1" in
start)
ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP up
route add -host $VIP dev lo:0
route add default gw $ROUTE
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo "VIP start"
;;

stop)
ifconfig lo:0 down
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_announce
echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo "VIP stop"
;;

*)
echo "USAGE start | stop"
exit 1
;;
esac


---------------------测试---------------------------
client#elinks http://10.212.183.3/index.html --dump
   hello,this is realserver02
client#elinks http://10.212.183.3/index.html --dump
   hello ,this is realserver01
client#elinks http://10.212.183.3/index.html --dump
   hello,this is realserver02
client#elinks http://10.212.183.3/index.html --dump
   hello ,this is realserver01