LVS-dr架构原理与实现方案
通过直接路由实现虚拟服务器（VS/DR）跟VS/TUN方法相同，VS/DR利用大多数Internet服务的非对称特点，负载调度器中只负责调度请求，而服务器直接将响应返回给客户，可以极大地提高整个集群系统的吞吐量。VS/DR的体系结构如图所示：调度器和服务器组都必须在物理上有一个网卡通过不分断的局域网相连，如通过高速的交换机或者HUB相连。VIP地址为调度器和服务器组共享，调度器配置的VIP地址是对外可见的，用于接收虚拟服务的请求报文；所有的服务器把VIP地址配置在各自的Non-ARP网络设备上，它对外面是不可见的，只是用于处理目标地址为VIP的网络请求。DR基本架构实现
环境准备：
设备
软件环境
网络环境
Director_server(dirdr)CentOS+IPVSrip eth0_192.168.1.121
vip eth0:0_192.168.1.200
real_server_a(rsa)CentOSrip eth0_192.168.1.118
vip lo:0_192.168.1.200
real_server_b(rsb)CentOSrip eth0_192.168.1.119
vip lo:0_192.168.1.200
操作方案：
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# 在dir上配置
# vim /usr/local/sbin/lvs_dr.sh
#! /bin/bash
echo 1 > /proc/sys/net/ipv4/ip_forward
ipv=/sbin/ipvsadm
vip=192.168.1.200
rs1=192.168.1.118
rs2=192.168.1.119
ifconfig eth0:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip dev eth0:0
$ipv -C
$ipv -A -t $vip:80 -s rr
$ipv -a -t $vip:80 -r $rs1:80 -g -w 1
$ipv -a -t $vip:80 -r $rs2:80 -g -w 1
# chmod a+x /usr/local/sbin/lvs_dr.sh
# /bin/bash /usr/local/sbin/lvs_dr.sh
# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP192.168.1.200:80 rr
-> 192.168.1.118:80 Route 1 0 0
-> 192.168.1.119:80 Route 1 0 0
# ifconfig -a
eth0 Link encap:EthernetHWaddr 00:0C:29:55:3E:24
inet addr:192.168.1.121Bcast:192.168.1.255Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe55:3e24/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:700 errors:0 dropped:0 overruns:0 frame:0
TX packets:474 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:68287 (66.6 KiB)TX bytes:76635 (74.8 KiB)
Interrupt:18 Base address:0x2000
eth0:0 Link encap:EthernetHWaddr 00:0C:29:55:3E:24
inet addr:192.168.1.200Bcast:192.168.1.200Mask:255.255.255.255
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
Interrupt:18 Base address:0x2000
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)TX bytes:0 (0.0 b)
# 在rsa与rsb上配置
# vim /usr/local/sbin/lvs_dr_rs.sh
#! /bin/bash
vip=192.168.1.200
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip 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
# chmod a+x /usr/local/sbin/lvs_dr_rs.sh
# /bin/bash /usr/local/sbin/lvs_dr_rs.sh
# ifconfig -a
eth0 Link encap:EthernetHWaddr 00:0C:29:56:5C:C5
inet addr:192.168.1.118Bcast:192.168.1.255Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe56:5cc5/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:549 errors:0 dropped:0 overruns:0 frame:0
TX packets:424 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:55100 (53.8 KiB)TX bytes:61251 (59.8 KiB)
Interrupt:18 Base address:0x2000
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric:1
RX packets:2 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:160 (160.0 b)TX bytes:160 (160.0 b)
lo:0 Link encap:Local Loopback
inet addr:192.168.1.200Mask:255.255.255.255
UP LOOPBACK RUNNINGMTU:65536Metric:1
浏览器测试：
在Linux客户端测试效果
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# curl 192.168.1.200
This is test page,this is A.
# curl 192.168.1.200
This is test page,this is B.
# curl 192.168.1.200
This is test page,this is A.
# curl 192.168.1.200
This is test page,this is B.
# curl 192.168.1.200
This is test page,this is A.
# curl 192.168.1.200
This is test page,this is B.
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