测试lvskeepalived高可用负载均衡集群第三讲

1、Linux负载均衡软件LVS 主讲人：高俊峰华章培训网、 华章培训网 Linux负载均衡软件LVS 华章培训网、 华章培训网 内容概述LVS集群的体系结构以及特点通过LVS+Keepalived搭建高可用的负载均衡集群系统测试LVS+Keepalived高可用负载均衡集群Linux负载均衡软件LVS 第三讲：测试LVS+Keepalived高可用负载均衡集群主讲人：高俊峰华章培训网、 华章培训网 1、 启动LVS高可用集群服务首先，启动每个real server节点的服务：rootlocalhost # /etc/init.d/lvsrs start start LVS of REALServ

2、er然后，分别在主备Director Server启动Keepalived服务：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 测试LVS+Keepalived高可用负载均衡集群第4页1、 启动LVS高可用集群服务此时查看Keepalived服务的系统日志信息如下: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.测试LVS+Keepalived高可用负载均衡集群第5页2、 高可用性功能测试高可用性是通过LVS的两个Director Serv

8、er完成的，为了模拟故障，我们先将主Director Server上面的Keepalived服务停止，然后观察备用Director Server上Keepalived的运行日志，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从日志中可以看出，主机出现故障后，备机立刻检测到，此时备机变为MASTER角色，并且接管了主机的虚拟IP资源，最后将虚拟IP绑定在eth0设备上。接着，重新

11、启动主Director Server上的Keepalived服务，继续观察备用Director Server的日志状态：测试LVS+Keepalived高可用负载均衡集群第6页2、 高可用性功能测试备用Director Server的日志状态：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.从日志可知，备机在检测到主机重新恢复正常后，重新返回BACKUP角色，并且释放了虚拟IP资源。测试LVS+Keepalived高可用负载均衡集群第7页3、 负载均衡测试这里假定两个real server节点配置www服务的网页文件根目录均为/webdata/www目录，然后分别执行如下操作：在real server1 执行：echo This is real server1 /webdata/www/index.html 在real server2 执行： echo This is real ser

14、ver2 /webdata/www/index.html接着打开浏览器，访问 这个地址，然后不断刷新此页面，如果能分别看到“This is real server1”和“This is real server2”就表明LVS已经在进行负载均衡了。测试LVS+Keepalived高可用负载均衡集群第8页4、 故障切换测试故障切换是测试当某个节点出现故障后，Keepalived监控模块是否能及时发现，然后屏蔽故障节点，同时将服务转移到正常节点来执行。这里我们将real server 1节点服务停掉，假定这个节点出现故障，然后查看主、备机日志信息，相关日志如下：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.通过日志可以看出，Keepalived监控模块检测到46这台主机出现故障后，将此节点从集群系统中剔除掉了。此时访问 这个地址，应该只能看到“This is real server2”了，这是因为节点1出现故障，而Keepalived监控模块将节点1从集群系统中剔除了。测试LVS+Keepalived高可用负载均衡集群第9页4、 故障切换测试下面重新启动real server 1节点的服务，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