測試lvskeepalived高可用負(fù)載均衡集群第三講

1、Linux負(fù)載均衡軟件LVS 主講人：高俊峰華章培訓(xùn)網(wǎng)、 華章培訓(xùn)網(wǎng) Linux負(fù)載均衡軟件LVS 華章培訓(xùn)網(wǎng)、 華章培訓(xùn)網(wǎng) 內(nèi)容概述LVS集群的體系結(jié)構(gòu)以及特點(diǎn)通過LVS+Keepalived搭建高可用的負(fù)載均衡集群系統(tǒng)測試LVS+Keepalived高可用負(fù)載均衡集群Linux負(fù)載均衡軟件LVS 第三講：測試LVS+Keepalived高可用負(fù)載均衡集群主講人：高俊峰華章培訓(xùn)網(wǎng)、 華章培訓(xùn)網(wǎng) 1、 啟動LVS高可用集群服務(wù)首先，啟動每個(gè)real server節(jié)點(diǎn)的服務(wù)：rootlocalhost # /etc/init.d/lvsrs start start LVS of REALServ

2、er然后，分別在主備Director Server啟動Keepalived服務(wù)：rootDR1 #/etc/init.d/Keepalived startrootDR1 #/ ipvsadm -LIP Virtual Server version 1.2.1 (size=4096)Prot LocalAddress:Port Scheduler Flags - RemoteAddress:Port Forward Weight ActiveConn InActConnTCP bogon:http rr - real-server1:http Route 1 1 0 - real-server2

3、:http Route 1 0 0 測試LVS+Keepalived高可用負(fù)載均衡集群第4頁1、 啟動LVS高可用集群服務(wù)此時(shí)查看Keepalived服務(wù)的系統(tǒng)日志信息如下:rootlocalhost # tail -f /var/log/messagesFeb 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 5 addedFeb

4、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 BytesFeb 28 10:01:56 localhost Keepalived: Starting Healthcheck child process, pid=4623Feb 28 10:01:56 localhost Keepaliv

5、ed_vrrp: Netlink reflector reports IP 5 addedFeb 28 10:01:56 localhost Keepalived: Starting VRRP child process, pid=4624Feb 28 10:01:56 localhost Keepalived_healthcheckers: Activating healtchecker for service 46:80Feb 28 10:01:56 localhost Keepalived_vrrp: Opening file /etc/keepalived/keepalived.con

6、f. Feb 28 10:01:56 localhost Keepalived_healthcheckers: Activating healtchecker for service 37:80Feb 28 10:01:57 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATEFeb 28 10:01:58 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATEFeb 28 10:01:58 localhost Keep

7、alived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs.Feb 28 10:01:58 localhost Keepalived_healthcheckers: Netlink reflector reports IP 35 addedFeb 28 10:01:58 localhost avahi-daemon2778: Registering new address record for 35 on eth0.測試LVS+Keepalived高可用負(fù)載均衡集群第5頁2、 高可用性功能測試高可用性是通過LVS的兩個(gè)Director Serv

8、er完成的，為了模擬故障，我們先將主Director Server上面的Keepalived服務(wù)停止，然后觀察備用Director Server上Keepalived的運(yùn)行日志，信息如下：Feb 28 10:08:52 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATEFeb 28 10:08:54 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATEFeb 28 10:08:54 lvs-backup Keep

9、alived_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 35Feb 28 10:08:54 lvs-backup Keepalived_vrrp: Netlink reflector reports IP 35 addedFeb 28 10:08:54 lvs-backup Keepalived_healthcheckers: Netlink

10、reflector reports IP 35 addedFeb 28 10:08:54 lvs-backup avahi-daemon3349: Registering new address record for 35 on eth0.Feb 28 10:08:59 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 35從日志中可以看出，主機(jī)出現(xiàn)故障后，備機(jī)立刻檢測到，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eth0設(shè)備上。接著，重新

11、啟動主Director Server上的Keepalived服務(wù)，繼續(xù)觀察備用Director Server的日志狀態(tài)：測試LVS+Keepalived高可用負(fù)載均衡集群第6頁2、 高可用性功能測試備用Director Server的日志狀態(tài)：Feb 28 10:12:11 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Received higher prio advertFeb 28 10:12:11 lvs-backup Keepalived_vrrp: VRRP_Instance(VI_1) Entering BACKUP STATEFe

12、b 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 35 removedFeb 28 10:12:11 lvs-backup Keepalived_healthcheckers: Netlink reflector reports IP 35 removedFeb 28 10:12:11 lvs-backup avahi-daemon

13、3349: Withdrawing address record for 35 on eth0.從日志可知，備機(jī)在檢測到主機(jī)重新恢復(fù)正常后，重新返回BACKUP角色，并且釋放了虛擬IP資源。測試LVS+Keepalived高可用負(fù)載均衡集群第7頁3、 負(fù)載均衡測試這里假定兩個(gè)real server節(jié)點(diǎn)配置www服務(wù)的網(wǎng)頁文件根目錄均為/webdata/www目錄，然后分別執(zhí)行如下操作：在real server1 執(zhí)行：echo This is real server1 /webdata/www/index.html 在real server2 執(zhí)行： echo This is real ser

14、ver2 /webdata/www/index.html接著打開瀏覽器，訪問 這個(gè)地址，然后不斷刷新此頁面，如果能分別看到“This is real server1”和“This is real server2”就表明LVS已經(jīng)在進(jìn)行負(fù)載均衡了。測試LVS+Keepalived高可用負(fù)載均衡集群第8頁4、 故障切換測試故障切換是測試當(dāng)某個(gè)節(jié)點(diǎn)出現(xiàn)故障后，Keepalived監(jiān)控模塊是否能及時(shí)發(fā)現(xiàn)，然后屏蔽故障節(jié)點(diǎn)，同時(shí)將服務(wù)轉(zhuǎn)移到正常節(jié)點(diǎn)來執(zhí)行。這里我們將real server 1節(jié)點(diǎn)服務(wù)停掉，假定這個(gè)節(jié)點(diǎn)出現(xiàn)故障，然后查看主、備機(jī)日志信息，相關(guān)日志如下：Feb 28 10:14:12 loc

15、alhost Keepalived_healthcheckers: TCP connection to 46:80 failed !Feb 28 10:14:12 localhost Keepalived_healthcheckers: Removing service 46:80 from VS 35:80Feb 28 10:14:12 localhost Keepalived_healthcheckers: Remote SMTP server :25 connected.Feb 28 10:14:12 localhost Keepalived_healthcheckers: SMTP a

16、lert successfully sent.通過日志可以看出，Keepalived監(jiān)控模塊檢測到46這臺主機(jī)出現(xiàn)故障后，將此節(jié)點(diǎn)從集群系統(tǒng)中剔除掉了。此時(shí)訪問 這個(gè)地址，應(yīng)該只能看到“This is real server2”了，這是因?yàn)楣?jié)點(diǎn)1出現(xiàn)故障，而Keepalived監(jiān)控模塊將節(jié)點(diǎn)1從集群系統(tǒng)中剔除了。測試LVS+Keepalived高可用負(fù)載均衡集群第9頁4、 故障切換測試下面重新啟動real server 1節(jié)點(diǎn)的服務(wù)，可以看到Keepalived日志信息如下：Feb 28 10:15:48 localhost Keepalived_healthcheckers: TCP connection to 46:80 success.Feb 28 10:15:48 localhost Keepalived_healthcheckers: Adding service 46:80 to VS 35:80Feb 28 10:15:48 localhost Keepalived_healthcheckers: Remote SMTP server :25 connected.Feb 28 10:15:48 localhost Keepalived_heal