源地址：http://www.cnblogs.com/mchina/archive/2012/08/27/2644391.html

一、簡介

VS/NAT原理圖：

二、系統環境

實驗拓撲：

系統平臺：CentOS 6.3

Kernel：2.6.32-279.el6.i686

LVS版本：ipvsadm-1.26

keepalived版本：keepalived-1.2.4

三、安裝

0、安裝LVS前系統需要安裝popt-static，kernel-devel，make，gcc，openssl-devel，lftp，libnl*，popt*

1、在兩臺Director Server上分別配置LVS+Keepalived

LVS install -------------

[root@CentOS-LVS_MASTER ~]# wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.26.tar.gz

[root@CentOS-LVS_MASTER ~]# ln -s /usr/src/kernels/2.6.32-279.el6.i686//usr/src/linux/

[root@CentOS-LVS_MASTER ~]# tar zxvf ipvsadm-1.26.tar.gz

[root@CentOS-LVS_MASTER ~]# cd ipvsadm-1.26

[root@CentOS-LVS_MASTER ipvsadm-1.26]# make && make install

Keepalived install -------------

[root@CentOS-LVS_MASTER ~]# wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz

[root@CentOS-LVS_MASTER ~]# tar zxvf keepalived-1.2.4.tar.gz

[root@CentOS-LVS_MASTER ~]# cd keepalived-1.2.4

[root@CentOS-LVS_MASTER keepalived-1.2.4]# ./configure && make && make install

#########?將keepalived做成啟動服務，方便管理##########

[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/

[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

[root@CentOS-LVS_MASTER ~]# mkdir /etc/keepalived/

[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/

[root@CentOS-LVS_MASTER ~]# cp /usr/local/sbin/keepalived /usr/sbin/

[root@CentOS-LVS_MASTER ~]# service keepalived start | stop

2、開啟路由轉發

[root@CentOS-LVS_MASTER ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
[root@CentOS-LVS_MASTER ~]# sysctl -p

3、配置Keepalived

[root@CentOS-LVS_MASTER ~]# less /etc/keepalived/keepalived.conf

! Configuration File for keepalivedglobal_defs {router_id LVS_MASTER #BACKUP上修改為LVS_BACKUP }vrrp_instance VI_1 {state MASTER #BACKUP上修改為BACKUPinterface eth0virtual_router_id 51priority 100 #BACKUP上修改為80advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {10.0.0.227} }vrrp_instance LAN_GATEWAY {state MASTER #BACKUP上修改為LVS_BACKUPinterface eth1virtual_router_id 52priority 100 #BACKUP上修改為80advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.10.10} }virtual_server 10.0.0.227 80 {delay_loop 6lb_algo rrlb_kind NAT # persistence_timeout 5protocol TCPreal_server 192.168.10.4 80 {weight 3TCP_CHECK {connect_timeout 3nb_get_retry 3delay_before_retry 3connect_port 80}}real_server 192.168.10.5 80 {weight 3TCP_CHECK {connect_timeout 3nb_get_retry 3delay_before_retry 3connect_port 80}} }

BACKUP服務器同上配置，先安裝lvs再安裝keepalived，然后配置/etc/keepalived/keepalived.conf，只需將批注部分改一下即可。

4、分別在2臺Real Server上面設置網關

把網關都設置成：192.168.10.10

5、在2臺RealServer中分別配置HTTP

[root@WEB1 ~]# yum -y install httpd
[root@WEB1 ~]# cd /var/www/html/
[root@WEB1 html]# cat index.html
<h1>WEB1/192.168.10.4</h1>
[root@WEB1 html]# /etc/init.d/httpd start
另一臺機器配置一樣，過程略。

6、分別在CentOS-LVS_MASTER、CentOS-LVS_BACKUP上執行service keepalived start啟動keepalived就可實現負載均衡及高可用集群了；

[root@CentOS-LVS_MASTER keepalived]# service keepalived start

四、測試

####高可用性測試####

模擬故障，將CentOS-LVS_MASTER上的keepalived服務停掉，然后觀察CentOS-LVS_BACKUP上的日志，信息如下

從日志中可知，主機出現故障后，備機立刻檢測到，此時備機變為MASTER角色，并且接管了主機的虛擬IP資源，最后將虛擬IP綁定在etho設備上。

將CentOS-LVS_MASTER?上的keepalived服務開啟后，CentOS-LVS_BACKUP的日志狀態。

從日志可知，備機在檢測到主機重新恢復正常后，釋放了虛擬IP資源重新成為BACKUP角色

####故障切換測試####

故障切換是測試當某個節點出現故障后，Keepalived監制模塊是否能及時發現然后屏蔽故障節點，同時將服務器轉移到正常節點來執行。

將WEB2節點服務停掉，假設這個節點出現故障，然后主、備機日志信息如下

從以上可以看出，Keepalived監控模塊檢測到192.168.10.5這臺主機出現故障后，將WEB2從集群系統中剔除掉了。?此時訪問http://10.0.0.227只能看到WEB1了)

重新啟動WEB2節點的服務，日志信息如下：

Keepalived監控模塊檢測到192.168.10.5這臺主機恢復正常后，又將此節點加入集群系統中，再次訪問就可以訪問到WEB2頁面了）

?

?

RHEL 5.4下部署LVS(DR)+keepalived實現高性能高可用負載均衡

http://www.cnblogs.com/mchina/archive/2012/05/23/2514728.html

轉載于:https://www.cnblogs.com/davidwang456/p/3292773.html

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