CentOS上配置LVS DR集群

I. 环境

3台集群服务器操作系统:CentOS 5.5 x86

1台客户端操作系统:Windows 2008 x64

II. 网络拓扑图

image

LVS集群使用DR模式,1个DS(Director Server),2个RS(Real Server)。路由只有一个,RouteA=RouteB。上图中的GW为网关(GateWay),VIP为LVS中的虚拟IP。

III. 服务器配置

· DS

修改/etc/sysctl.conf文件:

net.ipv4.ip_forward = 1

通过命令sysctl –p使其生效。

 

修改/etc/sysconfig/network-scripts/ifcfg-eth0文件:

DEVICE=eth0

BOOTPROTO=static

ONBOOT=yes

NETMASK=255.255.255.0

IPADDR=192.168.137.101

BROADCAST=192.168.137.255

GATEWAY=192.168.137.1

 

新建或修改/etc/sysconfig/network-scripts/ifcfg-eth0:0文件:

DEVICE=eth0:0

BOOTPROTO=static

ONBOOT=yes

NETMASK=255.255.255.0

IPADDR=192.168.137.137

BROADCAST=192.168.137.255

GATEWAY=192.168.137.1

 

配置后ifconfig命令返回如下结果:

eth0 Link encap:Ethernet HWaddr 08:00:27:25:39:D9

inet addr:192.168.137.101 Bcast:192.168.137.255 Mask:255.255.255.0

inet6 addr: fe80::a00:27ff:fe25:39d9/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:3757711 errors:0 dropped:0 overruns:0 frame:0

TX packets:2475767 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:250120448 (238.5 MiB) TX bytes:159666117 (152.2 MiB)

eth0:0 Link encap:Ethernet HWaddr 08:00:27:25:39:D9

inet addr:192.168.137.137 Bcast:192.168.137.255 Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

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:16436 Metric:1

RX packets:25241 errors:0 dropped:0 overruns:0 frame:0

TX packets:25241 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:3785187 (3.6 MiB) TX bytes:3785187 (3.6 MiB)

 

使用命令添加RS主机:

ipvsadm –C

ipvsadm -A -t 192.168.137.137:80 -s rr

ipvsadm -a -t 192.168.137.137:80 -r 192.168.137.102 -g

ipvsadm -a -t 192.168.137.137:80 -r 192.168.137.103 -g

ipvsadm -ln

在测试集群网络是否正确时,使用rr(Round-Robin)的集群模式容易查看集群是否正常工作。如果正常,在RS1和RS2的/var/www/html下放置内容不同的index.html文件,然后从客户端Client访问VIP(192.168.137.137),可以看到在浏览器中会交替显示RS1和RS2上不同的index.html内容。

 

· RS

修改/etc/sysctl.conf文件:

net.ipv4.ip_forward = 1

# For LVS

net.ipv4.conf.lo.arp_ignore=1

net.ipv4.conf.lo.arp_announce=2

net.ipv4.conf.all.arp_ignore=1

net.ipv4.conf.all.arp_announce=2

通过命令sysctl –p使其生效。

 

修改/etc/sysconfig/network-scripts/ifcfg-eth0文件:

DEVICE=eth0

BOOTPROTO=static

ONBOOT=yes

NETMASK=255.255.255.0

IPADDR=192.168.137.102

BROADCAST=192.168.137.255

GATEWAY=192.168.137.1

 

新建或修改/etc/sysconfig/network-scripts/ifcfg-lo:0文件:

DEVICE=lo:0

IPADDR=192.168.137.137

NETMASK=255.255.255.255

ONBOOT=yes

 

配置后ifconfig命令返回如下结果:

eth0 Link encap:Ethernet HWaddr 08:00:27:E4:DF:02

inet addr:192.168.137.102 Bcast:192.168.137.255 Mask:255.255.255.0

inet6 addr: fe80::a00:27ff:fee4:df02/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1670284 errors:0 dropped:0 overruns:0 frame:0

TX packets:871829 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:113130561 (107.8 MiB) TX bytes:54181142 (51.6 MiB)

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:16436 Metric:1

RX packets:25523 errors:0 dropped:0 overruns:0 frame:0

TX packets:25523 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:3769820 (3.5 MiB) TX bytes:3769820 (3.5 MiB)

lo:0 Link encap:Local Loopback

inet addr:192.168.137.137 Mask:255.255.255.255

UP LOOPBACK RUNNING MTU:16436 Metric:1

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