2023学年完整公开课版LVS案例配置

LVS案例配置目录PiranhaPiranhaPiranha2Keepalived安装3此时查看Keepalived服务的系统日志信息如下:[root@localhost~]#tail-f/var/log/messagesFeb2810:01:56localhostKeepalived:StartingKeepalivedv1.1.19(02/27,2011)Feb2810:01:56localhostKeepalived_healthcheckers:NetlinkreflectorreportsIP5addedFeb2810:01:56localhostKeepalived_healthcheckers:Openingfile'/etc/keepalived/keepalived.conf'.Feb2810:01:56localhostKeepalived_healthcheckers:Configurationisusing:12063Bytes启动LVS高可用集群服务4Feb2810:01:56localhostKeepalived:StartingHealthcheckchildprocess,pid=4623Feb2810:01:56localhostKeepalived_vrrp:NetlinkreflectorreportsIP5addedFeb2810:01:56localhostKeepalived:StartingVRRPchildprocess,pid=4624Feb2810:01:56localhostKeepalived_healthcheckers:Activatinghealtcheckerforservice[46:80]Feb2810:01:56localhostKeepalived_vrrp:Openingfile'/etc/keepalived/keepalived.conf'.Feb2810:01:56localhostKeepalived_healthcheckers:Activatinghealtcheckerforservice[37:80]5Feb2810:01:57localhostKeepalived_vrrp:VRRP_Instance(VI_1)TransitiontoMASTERSTATEFeb2810:01:58localhostKeepalived_vrrp:VRRP_Instance(VI_1)EnteringMASTERSTATEFeb2810:01:58localhostKeepalived_vrrp:VRRP_Instance(VI_1)settingprotocolVIPs.Feb2810:01:58localhostKeepalived_healthcheckers:NetlinkreflectorreportsIP35addedFeb2810:01:58localhostavahi-daemon[2778]:Registeringnewaddressrecordfor35oneth0.6

高可用性是通过LVS的两个DirectorServer完成的，为了模拟故障，我们先将主DirectorServer上面的Keepalived服务停止，然后观察备用DirectorServer上Keepalived的运行日志，信息如下：Feb2810:08:52lvs-backupKeepalived_vrrp:VRRP_Instance(VI_1)TransitiontoMASTERSTATEFeb2810:08:54lvs-backupKeepalived_vrrp:VRRP_Instance(VI_1)EnteringMASTERSTATEFeb2810:08:54lvs-backupKeepalived_vrrp:VRRP_Instance(VI_1)settingprotocolVIPs.Feb2810:08:54lvs-backupKeepalived_vrrp:VRRP_Instance(VI_1)SendinggratuitousARPsoneth0for35高可用性功能测试7Feb2810:08:54lvs-backupKeepalived_vrrp:NetlinkreflectorreportsIP35addedFeb2810:08:54lvs-backupKeepalived_healthcheckers:NetlinkreflectorreportsIP35addedFeb2810:08:54lvs-backupavahi-daemon[3349]:Registeringnewaddressrecordfor35oneth0.Feb2810:08:59lvs-backupKeepalived_vrrp:VRRP_Instance(VI_1)SendinggratuitousARPsoneth0for35

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，重新启动主DirectorServer上的Keepalived服务，继续观察备用DirectorServer的日志状态：8

这里假定两个realserver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realserver1执行：echo"Thisisrealserver1"/webdata/www/index.html 在realserver2执行：echo"Thisisrealserver2"/webdata/www/index.html

接着打开浏览器，访问35这个地址，然后不断刷新此页面，如果能分别看到“Thisisrealserver1”和“Thisisrealserver2”就表明LVS已经在进行负载均衡了。

负载均衡测试9

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realserver1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：Feb2810:14:12localhostKeepalived_healthcheckers:TCPconnectionto[46:80]failed!!!Feb2810:14:12localhostKeepalived_healthcheckers:Removingservice[46:80]fromVS[35:80]故障切换测试10Feb2810:14:12localhostKeepalived_healthcheckers:RemoteSMTPserver[:25]connected.Feb2810:14:12localhostKeepalived_healthcheckers:SMTPalertsuccessfullysent. 通过