LVS的三种转发模式

1： LVS-DR 模式(调度器与实际服务器都有一块网卡连在同一物理网段上)
简要的网络结构如下所示

配置LVS server
引用

#！/bin/sh
 VIP=192.168.10.100
 RIP1=192.168.10.201
 RIP2=192.168.10.202
 . /etc/rc.d/init.d/functions
         case "$1" in
         start)
         echo "start LVS of DirectorServer"
         #Set the Virtual IP Address
         /sbin/ifconfig eth0:1 $VIP broadcast $VIP netmask 255.255.255.255 up
         /sbin/route add -host $VIP dev eth0:1
         #Clear IPVS Table
         /sbin/ipvsadm -C
         #Set Lvs
         /sbin/ipvsadm -A -t $VIP:80 -s rr
         /sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -g
         /sbin/ipvsadm -a -t $VIP:80 -r $RIP2:80 -g
         #Run Lvs
         /sbin/ipvsadm
         ;;
         stop)
         echo "close LVS Directorserver"
         /sbin/ipvsadm -C
         /sbin/ifconfig eth0:1 down
         ;;
         *)
         echo "Usage： $0 {start|stop}"
         exit 1
         esac

配置 RIP server
引用

#!/bin/bash
 VIP=192.168.10.100
 LOCAL_Name=icesr.com
 BROADCAST=192.168.10.255  #vip's broadcast
 . /etc/rc.d/init.d/functions
 case "$1" in
     start)
      echo "reparing for Real Server"
        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
        ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $BROADCAST up
         /sbin/route add -host $VIP dev lo:0
         ;;
     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_ignore
        echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
         ;;
     *)
         echo "Usage: lvs {start|stop}"
         exit 1
 esac 

2: LVS-TUN 模式
简要的网络架构如下:

配置lvs server
引用

#!/bin/sh
 # description: start LVS of Directorserver
 VIP=192.168.10.100
 RIP1=192.168.10.201
 RIP2=192.168.10.202
 GW=192.168.10.1
 . /etc/rc.d/init.d/functions
 case "$1" in
 start)
 echo " start LVS of DirectorServer"
 # set the Virtual IP Address
 /sbin/ifconfig tunl0 $VIP broadcast $VIP netmask 255.255.255.0 up
 /sbin/route add -host $VIP dev tunl0
 #Clear IPVS table
 /sbin/ipvsadm -C
 #set LVS
 /sbin/ipvsadm -A -t $VIP:80 -s rr
 /sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -i
 /sbin/ipvsadm -a -t $VIP:80 -r $RIP2:80 -i
 #/sbin/ipvsadm -a -t $VIP:80 -r $RIP3:80 -i
 #Run LVS
 /sbin/ipvsadm
 #end
 ;;
 stop)
 echo "close LVS Directorserver"
 ifconfig tunl0 down
 /sbin/ipvsadm -C
 ;;
 *)
 echo "Usage: $0 {start|stop}"
 exit 1
 esac 

配置real server
引用

 #!/bin/sh
 # description: Config realserver tunl port and apply arp patch
 VIP=192.168.10.100
  . /etc/rc.d/init.d/functions
 case "$1" in
 start)
 echo "Tunl port starting"
 ifconfig tunl0 $VIP netmask 255.255.255.0 broadcast $VIP up
 /sbin/route add -host $VIP dev tunl0
 echo "1" >/proc/sys/net/ipv4/conf/tunl0/arp_ignore
 echo "2" >/proc/sys/net/ipv4/conf/tunl0/arp_announce
 echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
 echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
 sysctl -p
 ;;
 stop)
 echo "Tunl port closing"
 ifconfig tunl0 down
 echo 1 > /proc/sys/net/ipv4/ip_forward
 echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
 ;;
 *)
 echo "Usage: $0 {start|stop}"
 exit 1
 esac 

3: LVS-NAT 模式
简要的网络架构如下图:

配置LVS server
引用

#!/bin/sh
 # description: start LVS of Nat
 VIP=192.168.10.100
 RIP1=10.1.1.2
 RIP2=10.1.1.3
 GW=10.1.1.1
 . /etc/rc.d/init.d/functions
 case "$1" in
 start)
 echo " start LVS of NAtServer"
 echo "1" >/proc/sys/net/ipv4/ip_forward
 echo "0" >/proc/sys/net/ipv4/conf/all/send_redirects
 echo "0" >/proc/sys/net/ipv4/conf/default/send_redirects
 echo "0" >/proc/sys/net/ipv4/conf/eth0/send_redirects
 echo "0" >/proc/sys/net/ipv4/conf/eth1/send_redirects(内网卡上的)
 #Clear IPVS table
 /sbin/ipvsadm -C
 #set LVS
 /sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -m -w 1
 /sbin/ipvsadm -a -t $VIP:80 -r $RIP2:80 -m -w 1
 #Run LVS
 /sbin/ipvsadm
 #end
 ;;
 stop)
 echo "close LVS Nat server"
 echo "0" >/proc/sys/net/ipv4/ip_forward
 echo "1" >/proc/sys/net/ipv4/conf/all/send_redirects
 echo "1" >/proc/sys/net/ipv4/conf/default/send_redirects
 echo "1" >/proc/sys/net/ipv4/conf/eth0/send_redirects
 echo "1" >/proc/sys/net/ipv4/conf/eth1/send_redirects(内网卡上的)
 /sbin/ipvsadm -C
 ;;
 *)
 echo "Usage: $0 {start|stop}"
 exit 1
 esac 

配置real server
LVS-Nat 模式的后端机器不需要配置.

tips： -g 表示使用DR方式，-m表示NAT方式，-i表示tunneling方式。

LVS 三种工作模式的优缺点比较见：http://www.icesr.com/index.php/archives/544

本文转自：http://www.uml.org.cn/

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