LVS-dr架构原理与实现方案

wer21213

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+IPVS	rip eth0_192.168.1.121
		vip eth0:0_192.168.1.200
real_server_a(rsa)	CentOS	rip eth0_192.168.1.118
		vip lo:0_192.168.1.200
real_server_b(rsb)	CentOS	rip 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 [iyunv@dir ~]# 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 [iyunv@dir ~]# chmod a+x /usr/local/sbin/lvs_dr.sh [iyunv@dir ~]# /bin/bash /usr/local/sbin/lvs_dr.sh [iyunv@dir ~]# ipvsadm -ln IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags   -> RemoteAddress:Port           Forward Weight ActiveConn InActConn TCP  192.168.1.200:80 rr   -> 192.168.1.118:80             Route   1      0          0   -> 192.168.1.119:80             Route   1      0          0 [iyunv@dir ~]# ifconfig -a eth0      Link encap:Ethernet  HWaddr 00:0C:29:55:3E:24           inet addr:192.168.1.121  Bcast:192.168.1.255  Mask:255.255.255.0           inet6 addr: fe80::20c:29ff:fe55:3e24/64 Scope:Link           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric: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:Ethernet  HWaddr 00:0C:29:55:3E:24           inet addr:192.168.1.200  Bcast:192.168.1.200  Mask:255.255.255.255           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1           Interrupt:18 Base address:0x2000 lo        Link encap:Local Loopback           inet addr:127.0.0.1  Mask:255.0.0.0           inet6 addr: ::1/128 Scope:Host           UP LOOPBACK RUNNING  MTU:65536  Metric: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 [iyunv@rsa ~]# 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 [iyunv@rsa ~]# chmod a+x /usr/local/sbin/lvs_dr_rs.sh [iyunv@rsa ~]# /bin/bash /usr/local/sbin/lvs_dr_rs.sh [iyunv@rsa ~]# ifconfig -a eth0      Link encap:Ethernet  HWaddr 00:0C:29:56:5C:C5           inet addr:192.168.1.118  Bcast:192.168.1.255  Mask:255.255.255.0           inet6 addr: fe80::20c:29ff:fe56:5cc5/64 Scope:Link           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric: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:127.0.0.1  Mask:255.0.0.0           inet6 addr: ::1/128 Scope:Host           UP LOOPBACK RUNNING  MTU:65536  Metric: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:192.168.1.200  Mask:255.255.255.255           UP LOOPBACK RUNNING  MTU:65536  Metric:1

浏览器测试：

在Linux客户端测试效果

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[iyunv@client ~]# curl 192.168.1.200 This is test page,this is A. [iyunv@client ~]# curl 192.168.1.200 This is test page,this is B. [iyunv@client ~]# curl 192.168.1.200 This is test page,this is A. [iyunv@client ~]# curl 192.168.1.200 This is test page,this is B. [iyunv@client ~]# curl 192.168.1.200 This is test page,this is A. [iyunv@client ~]# curl 192.168.1.200 This is test page,this is B.