hi ,
please guide do i installed Host Machine properly

Error: unable to Add Host

2011-06-23 00:35:38,875 INFO [agent.manager.AgentManagerImpl] (catalina-exec-20:null) Trying to add a new host at 192.168.1.80 in data center 1
2011-06-23 00:35:39,223 DEBUG [kvm.discoverer.KvmServerDiscoverer] (catalina-exec-20:null) Executing cmd: lsmod|grep kvm >& /dev/null
2011-06-23 00:35:41,419 DEBUG [kvm.discoverer.KvmServerDiscoverer] (catalina-exec-20:null) Executing cmd: lsmod|grep kvm >& /dev/null
2011-06-23 00:35:43,498 DEBUG [kvm.discoverer.KvmServerDiscoverer] (catalina-exec-20:null) Executing cmd: lsmod|grep kvm >& /dev/null
2011-06-23 00:35:45,579 DEBUG [kvm.discoverer.KvmServerDiscoverer] (catalina-exec-20:null) It's not a KVM enabled machine
2011-06-23 00:35:45,580 WARN [agent.manager.AgentManagerImpl] (catalina-exec-20:null) Unable to find the server resources at 192.168.1.80
2011-06-23 00:35:45,582 WARN [api.commands.AddHostCmd] (catalina-exec-20:null) Exception:
com.cloud.exception.DiscoveryException: Unable to add the host
at com.cloud.agent.manager.AgentManagerImpl.discoverHosts(AgentManagerImpl.java:915)
at com.cloud.agent.manager.AgentManagerImpl.discoverHosts(AgentManagerImpl.java:748)
at com.cloud.api.commands.AddHostCmd.execute(AddHostCmd.java:118)
at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:143)
at com.cloud.api.ApiServer.queueCommand(ApiServer.java:425)
at com.cloud.api.ApiServer.handleRequest(ApiServer.java:345)
at com.cloud.api.ApiServlet.processRequest(ApiServlet.java:266)
at com.cloud.api.ApiServlet.doGet(ApiServlet.java:64)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:883)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:721)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2258)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)
2011-06-23 00:35:45,585 WARN [cloud.api.ApiDispatcher] (catalina-exec-20:null) class com.cloud.api.ServerApiException : Unable to add the host
2011-06-23 00:36:02,275 INFO [storage.upload.UploadMonitorImpl] (UploadMonitor-Scavenger-1:null) Extract Monitor Garbage Collection Thread is running.
2011-06-23 00:36:02,290 INFO [agent.manager.AgentMonitor] (AgentMonitor:null) Found 0 hosts behind on ping. pingTimeout : 150, mark time : 1278095125

I guess you just installed the cloudstack agent, which installed kvm related packages. But you should reboot to have it loaded.

did u run cloud-setup-agent script ?

In My Host Machine , i installed Centos 5.6 but i thought kvm would be installed by default of cloud Agent script , but later i checked with Manager log file it shows kvm not enabled in host.

so i checked with following commands,

[root@localhost ~]# lsmod | grep kvm

I received empty response , but i want to know how to install kvm in centos 5.6

KVM should have been installed with the install.sh script of cloudstack. But the kernel module was not loaded. Did you try to reboot your Host ? You can check kvm is installed with the rpm command.
If after a reboot it still does not work, check out the logs in both management server and agent, perhaps there's a missing dependency somewhere.

Myself installed Cloud Agent Script and rebooted it and ran following command

# lsmod | grep kvm

but still empty response

Also tried to add host in mgmt. console but facing same issues

2011-06-24 02:13:45,637 INFO [agent.manager.AgentMonitor] (AgentMonitor:null) Found 0 hosts behind on ping. pingTimeout : 150, mark time : 1278185226
2011-06-24 02:14:00,140 DEBUG [cloud.server.StatsCollector] (StatsCollector-2:null) VmStatsCollector is running...
2011-06-24 02:14:00,140 DEBUG [cloud.server.StatsCollector] (StatsCollector-3:null) HostStatsCollector is running...
2011-06-24 02:14:45,646 INFO [agent.manager.AgentMonitor] (AgentMonitor:null) Found 0 hosts behind on ping. pingTimeout : 150, mark time : 1278185285
2011-06-24 02:15:00,148 DEBUG [cloud.server.StatsCollector] (StatsCollector-1:null) VmStatsCollector is running...
2011-06-24 02:15:00,148 DEBUG [cloud.server.StatsCollector] (StatsCollector-3:null) HostStatsCollector is running...
2011-06-24 02:15:45,407 INFO [storage.upload.UploadMonitorImpl] (UploadMonitor-Scavenger-1:null) Extract Monitor Garbage Collection Thread is running.
2011-06-24 02:15:45,658 INFO [agent.manager.AgentMonitor] (AgentMonitor:null) Found 0 hosts behind on ping. pingTimeout : 150, mark time : 1278185343
2011-06-24 02:16:00,156 DEBUG [cloud.server.StatsCollector] (StatsCollector-2:null) HostStatsCollector is running...
2011-06-24 02:16:00,156 DEBUG [cloud.server.StatsCollector] (StatsCollector-3:null) VmStatsCollector is running...
2011-06-24 02:16:45,149 DEBUG [network.router.VirtualNetworkApplianceManagerImpl] (RouterMonitor-1:null) Found 0 running routers.
2011-06-24 02:16:45,204 DEBUG [cloud.network.ExternalNetworkManagerImpl] (ExternalNetworkMonitor-1:null) External network stats collector is running...
2011-06-24 02:16:45,207 DEBUG [cloud.network.ExternalNetworkManagerImpl] (ExternalNetworkMonitor-1:null) Zone zone1 is not configured for external networking, so skipping usage check.
2011-06-24 02:16:45,209 DEBUG [cloud.network.ExternalNetworkManagerImpl] (ExternalNetworkMonitor-1:null) External network stats collector is running...
2011-06-24 02:16:45,212 DEBUG [cloud.network.ExternalNetworkManagerImpl] (ExternalNetworkMonitor-1:null) Zone zone1 is not configured for external networking, so skipping usage check.
2011-06-24 02:16:45,213 DEBUG [cloud.network.ExternalNetworkManagerImpl] (ExternalNetworkMonitor-1:null) External network stats collector is running...
2011-06-24 02:16:45,216 DEBUG [cloud.network.ExternalNetworkManagerImpl] (ExternalNetworkMonitor-1:null) Zone zone1 is not configured for external networking, so skipping usage check.
2011-06-24 02:16:45,248 DEBUG [storage.snapshot.SnapshotSchedulerImpl] (SnapshotPollTask:null) Snapshot scheduler.poll is being called at 2011-06-23 20:46:45 GMT
2011-06-24 02:16:45,250 DEBUG [storage.snapshot.SnapshotSchedulerImpl] (SnapshotPollTask:null) Got 0 snapshots to be executed at 2011-06-23 20:46:45 GMT
2011-06-24 02:16:45,670 INFO [agent.manager.AgentMonitor] (AgentMonitor:null) Found 0 hosts behind on ping. pingTimeout : 150, mark time : 1278185402
2011-06-24 02:17:00,163 DEBUG [cloud.server.StatsCollector] (StatsCollector-3:null) VmStatsCollector is running...
2011-06-24 02:17:00,163 DEBUG [cloud.server.StatsCollector] (StatsCollector-2:null) HostStatsCollector is running...
2011-06-24 02:17:01,508 INFO [agent.manager.AgentManagerImpl] (catalina-exec-11:null) Trying to add a new host at 192.168.1.80 in data center 1
2011-06-24 02:17:01,871 DEBUG [kvm.discoverer.KvmServerDiscoverer] (catalina-exec-11:null) Executing cmd: lsmod|grep kvm >& /dev/null
2011-06-24 02:17:04,008 DEBUG [kvm.discoverer.KvmServerDiscoverer] (catalina-exec-11:null) Executing cmd: lsmod|grep kvm >& /dev/null
2011-06-24 02:17:06,092 DEBUG [kvm.discoverer.KvmServerDiscoverer] (catalina-exec-11:null) Executing cmd: lsmod|grep kvm >& /dev/null
2011-06-24 02:17:08,172 DEBUG [kvm.discoverer.KvmServerDiscoverer] (catalina-exec-11:null) It's not a KVM enabled machine
2011-06-24 02:17:08,174 WARN [agent.manager.AgentManagerImpl] (catalina-exec-11:null) Unable to find the server resources at 192.168.1.80
2011-06-24 02:17:08,174 WARN [api.commands.AddHostCmd] (catalina-exec-11:null) Exception:
com.cloud.exception.DiscoveryException: Unable to add the host
at com.cloud.agent.manager.AgentManagerImpl.discoverHosts(AgentManagerImpl.java:915)
at com.cloud.agent.manager.AgentManagerImpl.discoverHosts(AgentManagerImpl.java:748)
at com.cloud.api.commands.AddHostCmd.execute(AddHostCmd.java:118)
at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:143)
at com.cloud.api.ApiServer.queueCommand(ApiServer.java:425)
at com.cloud.api.ApiServer.handleRequest(ApiServer.java:345)
at com.cloud.api.ApiServlet.processRequest(ApiServlet.java:266)
at com.cloud.api.ApiServlet.doGet(ApiServlet.java:64)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:883)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:721)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2258)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)
2011-06-24 02:17:08,176 WARN [cloud.api.ApiDispatcher] (catalina-exec-11:null) class com.cloud.api.ServerApiException : Unable to add the host