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

一、簡(jiǎn)介

VS/NAT原理圖：

二、系統(tǒng)環(huán)境

實(shí)驗(yàn)拓?fù)?#xff1a;

系統(tǒng)平臺(tái)：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(tǒng)需要安裝popt-static，kernel-devel，make，gcc，openssl-devel，lftp，libnl*，popt*

1、在兩臺(tái)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(dòng)服務(wù)，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(kāi)啟路由轉(zhuǎn)發(fā)

[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L(zhǎng)VS_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L(zhǎng)VS_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(wù)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(tái)Real Server上面設(shè)置網(wǎng)關(guān)

把網(wǎng)關(guān)都設(shè)置成：192.168.10.10

5、在2臺(tái)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(tái)機(jī)器配置一樣，過(guò)程略。

6、分別在CentOS-LVS_MASTER、CentOS-LVS_BACKUP上執(zhí)行service keepalived start啟動(dòng)keepalived就可實(shí)現(xiàn)負(fù)載均衡及高可用集群了；

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

四、測(cè)試

####高可用性測(cè)試####

模擬故障，將CentOS-LVS_MASTER上的keepalived服務(wù)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(jī)出現(xiàn)故障后，備機(jī)立刻檢測(cè)到，此時(shí)備機(jī)變?yōu)镸ASTER角色，并且接管了主機(jī)的虛擬IP資源，最后將虛擬IP綁定在etho設(shè)備上。

將CentOS-LVS_MASTER?上的keepalived服務(wù)開(kāi)啟后，CentOS-LVS_BACKUP的日志狀態(tài)。

從日志可知，備機(jī)在檢測(cè)到主機(jī)重新恢復(fù)正常后，釋放了虛擬IP資源重新成為BACKUP角色

####故障切換測(cè)試####

故障切換是測(cè)試當(dāng)某個(gè)節(jié)點(diǎn)出現(xiàn)故障后，Keepalived監(jiān)制模塊是否能及時(shí)發(fā)現(xiàn)然后屏蔽故障節(jié)點(diǎn)，同時(shí)將服務(wù)器轉(zhuǎn)移到正常節(jié)點(diǎn)來(lái)執(zhí)行。

將WEB2節(jié)點(diǎn)服務(wù)停掉，假設(shè)這個(gè)節(jié)點(diǎn)出現(xiàn)故障，然后主、備機(jī)日志信息如下

從以上可以看出，Keepalived監(jiān)控模塊檢測(cè)到192.168.10.5這臺(tái)主機(jī)出現(xiàn)故障后，將WEB2從集群系統(tǒng)中剔除掉了。?此時(shí)訪問(wèn)http://10.0.0.227只能看到WEB1了)

重新啟動(dòng)WEB2節(jié)點(diǎn)的服務(wù)，日志信息如下：

Keepalived監(jiān)控模塊檢測(cè)到192.168.10.5這臺(tái)主機(jī)恢復(fù)正常后，又將此節(jié)點(diǎn)加入集群系統(tǒng)中，再次訪問(wèn)就可以訪問(wèn)到WEB2頁(yè)面了）

?

?

RHEL 5.4下部署LVS(DR)+keepalived實(shí)現(xiàn)高性能高可用負(fù)載均衡

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

轉(zhuǎn)載于:https://www.cnblogs.com/davidwang456/p/3292773.html

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