標籤:blog http io os ar for strong sp div
一、簡介
VS/NAT原理圖:
二、系統內容
實驗拓撲:
系統平台: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、在兩台Director Server上分別配置LVS+Keepalived
LVS install -------------
[[email protected]_MASTER ~]# wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.26.tar.gz
[[email protected]_MASTER ~]# ln -s /usr/src/kernels/2.6.32-279.el6.i686//usr/src/linux/
[[email protected]_MASTER ~]# tar zxvf ipvsadm-1.26.tar.gz
[[email protected]_MASTER ~]# cd ipvsadm-1.26
[[email protected]_MASTER ipvsadm-1.26]# make && make install
Keepalived install -------------
[[email protected]_MASTER ~]# wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz
[[email protected]_MASTER ~]# tar zxvf keepalived-1.2.4.tar.gz
[[email protected]_MASTER ~]# cd keepalived-1.2.4
[[email protected]_MASTER keepalived-1.2.4]# ./configure && make && make install
######### 將keepalived做成啟動服務,方便管理##########
[[email protected]_MASTER ~]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
[[email protected]_MASTER ~]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[[email protected]_MASTER ~]# mkdir /etc/keepalived/
[[email protected]_MASTER ~]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
[[email protected]_MASTER ~]# cp /usr/local/sbin/keepalived /usr/sbin/
[[email protected]_MASTER ~]# service keepalived start | stop
2、開啟路由轉寄
[[email protected]_MASTER ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
[[email protected]_MASTER ~]# sysctl -p
3、配置Keepalived
[[email protected]_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BACKUP interface eth0 virtual_router_id 51 priority 100 #BACKUP上修改為80 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.227 }}vrrp_instance LAN_GATEWAY { state MASTER #BACKUP上修改為LVS_BACKUP interface eth1 virtual_router_id 52 priority 100 #BACKUP上修改為80 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.10.10 }}virtual_server 10.0.0.227 80 { delay_loop 6 lb_algo rr lb_kind NAT# persistence_timeout 5 protocol TCP real_server 192.168.10.4 80 { weight 3 TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 connect_port 80 } } real_server 192.168.10.5 80 { weight 3 TCP_CHECK { connect_timeout 3 nb_get_retry 3 delay_before_retry 3 connect_port 80 } }}
BACKUP伺服器同上配置,先安裝lvs再安裝keepalived,然後配置/etc/keepalived/keepalived.conf,只需將批註部分改一下即可。
4、分別在2台Real Server上面設定網關
把網關都設定成:192.168.10.10
5、在2台RealServer中分別配置HTTP
[[email protected] ~]# yum -y install httpd
[[email protected] ~]# cd /var/www/html/
[[email protected] html]# cat index.html
<h1>WEB1/192.168.10.4</h1>
[[email protected] html]# /etc/init.d/httpd start
另一台機器配置一樣,過程略。
6、分別在CentOS-LVS_MASTER、CentOS-LVS_BACKUP上執行service keepalived start啟動keepalived就可實現負載平衡及高可用叢集了;
[[email protected]_MASTER keepalived]# service keepalived start
四、測試
####高可用性測試####
類比故障,將CentOS-LVS_MASTER上的keepalived服務停掉,然後觀察CentOS-LVS_BACKUP上的日誌,資訊如下
從日誌中可知,主機出現故障後,備機立刻檢測到,此時備機變為MASTER角色,並且接管了主機的虛擬IP資源,最後將虛擬IP綁定在etho裝置上。
將CentOS-LVS_MASTER 上的keepalived服務開啟後,CentOS-LVS_BACKUP的日誌狀態。
從日誌可知,備機在檢測到主機重新恢複正常後,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後,Keepalived監製模組是否能及時發現然後屏蔽故障節點,同時將伺服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,然後主、備機日誌資訊如下
從以上可以看出,Keepalived監控模組檢測到192.168.10.5這台主機出現故障後,將WEB2從叢集系統中剔除掉了。 此時訪問http://10.0.0.227隻能看到WEB1了)
重新啟動WEB2節點的服務,日誌資訊如下:
Keepalived監控模組檢測到192.168.10.5這台主機恢複正常後,又將此節點加入叢集系統中,再次訪問就可以訪問到WEB2頁面了)
RHEL 5.4下部署LVS(DR)+keepalived實現高效能高可用負載平衡
http://www.cnblogs.com/mchina/archive/2012/05/23/2514728.html
分類: Linux Server標籤: NAT, LVS, keepalived, 高效能高可用, 負載平衡
CentOS 6.3下部署LVS(NAT)+keepalived實現高效能高可用負載平衡【轉】