LVS三种模式

LVS三种（LVS-DR,LVS-NAT,LVS-TUN）模式的简要配置
LVS是什么:



首先是安装ipvsadm管理程序
下载：
注意对应自己的内核版本
ipvsadm-1.24.tar.gz
tar zxvf ipvsadm-1.24.tar.gz
cd ipvsadm-1.24
make
make install

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=192.168.0.210
RIP1=192.168.0.175
RIP2=192.168.0.145
. /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=192.168.0.210
LOCAL_Name=50bang
BROADCAST=192.168.0.255  #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=192.168.25.41（注意，lvs server那台机器2个ip，一个是vip,一个是本身ip例如192.168.25.42）
RIP1=192.168.25.44
RIP2=192.168.25.45
#RIPn=192.168.0.n
GW=192.168.25.254
. /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
# ghb in 20060812
# description: Config realserver tunl port and apply arp patch
VIP=192.168.25.43
. /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
VLAN-IP=202.99.59.110
RIP1=10.1.1.2
RIP2=10.1.1.3
#RIPn=10.1.1.n
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 202.99.59.110:80 -r 10.1.1.2:80 -m -w 1
/sbin/ipvsadm -a -t 202.99.59.110:80 -r 10.1.1.3:80 -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。