首先，啟動每個real server節點的服務：
[root@localhost ~]# /etc/init.d/lvsrs start
start LVS of REALServer
然後，分別在主備Director Server啟動Keepalived服務：
[root@DR1 ~]#/etc/init.d/Keepalived start
[root@DR1 ~]#/ ipvsadm -L
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP bogon:http rr
-> real-server1:http Route 1 1 0
-> real-server2:http Route 1 1 0
此時查看Keepalived服務的系統日誌資訊如下:
[root@localhost ~]# tail -f /var/log/messages
Feb 28 10:01:56 localhost Keepalived: Starting Keepalived v1.1.19 (02/27,2011)
Feb 28 10:01:56 localhost Keepalived_healthcheckers: Netlink reflector reports IP 192.168.12.25 added
Feb 28 10:01:56 localhost Keepalived_healthcheckers: Opening file '/etc/keepalived/keepalived.conf'.
Feb 28 10:01:56 localhost Keepalived_healthcheckers: Configuration is using : 12063 Bytes
Feb 28 10:01:56 localhost Keepalived: Starting Healthcheck child process, pid=4623
Feb 28 10:01:56 localhost Keepalived_vrrp: Netlink reflector reports IP 192.168.12.25 added
Feb 28 10:01:56 localhost Keepalived: Starting VRRP child process, pid=4624
Feb 28 10:01:56 localhost Keepalived_healthcheckers: Activating healtchecker for service [192.168.12.246:80]
Feb 28 10:01:56 localhost Keepalived_vrrp: Opening file '/etc/keepalived/keepalived.conf'.
Feb 28 10:01:56 localhost Keepalived_healthcheckers: Activating healtchecker for service [192.168.12.237:80]
Feb 28 10:01:57 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
Feb 28 10:01:58 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
Feb 28 10:01:58 localhost Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
Feb 28 10:01:58 localhost Keepalived_healthcheckers: Netlink reflector reports IP 192.168.12.135 added
Feb 28 10:01:58 localhost avahi-daemon[2778]: Registering new address record for 192.168.12.135 on eth0.
二、 高可用性功能測試
高可用性是通過LVS的兩個Director Server完成的，為了類比故障，我們先將主Director Server上面的Keepalived服務停止，然後觀察備用Director Server上Keepalived的作業記錄，資訊如下：
Feb 28 10:08:52 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE
Feb 28 10:08:54 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE
Feb 28 10:08:54 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.
Feb 28 10:08:54 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.12.135
Feb 28 10:08:54 lvs-backup Keepalived_vrrp: Netlink reflector reports IP 192.168.12.135 added
Feb 28 10:08:54 lvs-backup Keepalived_healthcheckers: Netlink reflector reports IP 192.168.12.135 added
Feb 28 10:08:54 lvs-backup avahi-daemon[3349]: Registering new address record for 192.168.12.135 on eth0.
Feb 28 10:08:59 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.12.135
從日誌中可以看出，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eth0裝置上。
接著，重新啟動主Director Server上的Keepalived服務，繼續觀察備用Director Server的日誌狀態：
備用Director Server的日誌狀態：
Feb 28 10:12:11 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Received higher prio advert
Feb 28 10:12:11 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATE
Feb 28 10:12:11 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) removing protocol VIPs.
Feb 28 10:12:11 lvs-backup Keepalived_vrrp: Netlink reflector reports IP 192.168.12.135 removed
Feb 28 10:12:11 lvs-backup Keepalived_healthcheckers: Netlink reflector reports IP 192.168.12.135 removed
Feb 28 10:12:11 lvs-backup avahi-daemon[3349]: Withdrawing address record for 192.168.12.135 on eth0.
從日誌可知，備機在檢測到主機重新恢複正常後，重新返回BACKUP角色，並且釋放了虛擬IP資源。
三、 負載平衡測試
這裡假定兩個real server節點配置www服務的網頁檔案根目錄均為/webdata/www目錄，然後分別執行如下操作：
在real server1 執行：
echo "This is real server1" /webdata/www/index.html
在real server2 執行：
echo "This is real server2" /webdata/www/index.html
接著開啟瀏覽器，訪問http://192.168.12.135這個地址，然後不斷重新整理此頁面，如果能分別看到“This is real server1”和“This is real server2”就表明LVS已經在進行負載平衡了。
四、 故障切換測試
故障切換是測試當某個節點出現故障後，Keepalived監控模組是否能及時發現，然後屏蔽故障節點，同時將服務轉移到正常節點來執行。
這裡我們將real server 1節點服務停掉，假定這個節點出現故障，然後查看主、備機日誌資訊，相關日誌如下：
Feb 28 10:14:12 localhost Keepalived_healthcheckers: TCP connection to [192.168.12.246:80] failed !!!
Feb 28 10:14:12 localhost Keepalived_healthcheckers: Removing service [192.168.12.246:80] from VS [192.168.12.135:80]
Feb 28 10:14:12 localhost Keepalived_healthcheckers: Remote SMTP server [192.168.12.1:25] connected.
Feb 28 10:14:12 localhost Keepalived_healthcheckers: SMTP alert successfully sent.
通過日誌可以看出，Keepalived監控模組檢測到192.168.12.246這台主機出現故障後，將此節點從叢集系統中剔除掉了。
此時訪問http://192.168.12.135這個地址，應該只能看到“This is real server2”了，這是因為節點1出現故障，而Keepalived監控模組將節點1從叢集系統中剔除了。
下面重新啟動real server 1節點的服務，可以看到Keepalived日誌資訊如下：
Feb 28 10:15:48 localhost Keepalived_healthcheckers: TCP connection to [192.168.12.246:80] success.
Feb 28 10:15:48 localhost Keepalived_healthcheckers: Adding service [192.168.12.246:80] to VS [192.168.12.135:80]
Feb 28 10:15:48 localhost Keepalived_healthcheckers: Remote SMTP server [192.168.12.1:25] connected.
Feb 28 10:15:48 localhost Keepalived_healthcheckers: SMTP alert successfully sent.
從日誌可知，Keepalived監控模組檢測到192.168.12.246這台主機恢複正常後，又將此節點加入了叢集系統中。
此時再次訪問http://192.168.12.135這個地址，然後不斷重新整理此頁面，應該又能分別看到“This is real server1”和“This is real server2”頁面了，這說明在real server 1節點恢複正常後，Keepalived監控模組將此節點加入了叢集系統中。
