Checklist:
- Latest build #160 or above from 
http://jenkins.cloudstack.org/job/build-4.0-rhel63/
- Manually install jsvc package
- On mgmt server, check selinux policy
- Reinstall database, drop old databases and grant privileges (optiional)
- Agent is installed
- virt daemon is restarted and is running
- kvm modules are loaded as Wido suggests

I tested with 159, basic zone. Works for me.

On 25-Sep-2012, at 2:28 PM, Abhinav Roy 
<abhinav....@citrix.com<mailto:abhinav....@citrix.com>> wrote:

Hi,

While adding a KVM host (Rhel 6.3) to the management server we are getting this 
error and the addition of host fails:

2012-09-25 12:35:14,214 INFO  [cloud.resource.ResourceManagerImpl] 
(catalina-exec-17:null) Trying to add a new host athttp://10.102.125.13 in data 
center 1
2012-09-25 12:35:14,594 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-17:null) 
Executing cmd: lsmod|grep kvm
2012-09-25 12:35:16,759 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-17:null) 
Executing cmd: lsmod|grep kvm
2012-09-25 12:35:18,818 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-17:null) 
Executing cmd: lsmod|grep kvm
2012-09-25 12:35:20,875 DEBUG [kvm.discoverer.KvmServerDiscoverer] 
(catalina-exec-17:null) It's not a KVM enabled machine
2012-09-25 12:35:20,876 WARN  [cloud.resource.ResourceManagerImpl] 
(catalina-exec-17:null) Unable to find the server resources at 
http://10.102.125.13
2012-09-25 12:35:20,877 WARN  [api.commands.AddHostCmd] (catalina-exec-17:null) 
Exception:
com.cloud.exception.DiscoveryException: Unable to add the host
        at 
com.cloud.resource.ResourceManagerImpl.discoverHostsFull(ResourceManagerImpl.java:737)
        at 
com.cloud.resource.ResourceManagerImpl.discoverHosts(ResourceManagerImpl.java:544)
        at com.cloud.api.commands.AddHostCmd.execute(AddHostCmd.java:140)
        at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:138)
        at com.cloud.api.ApiServer.queueCommand(ApiServer.java:543)
        at com.cloud.api.ApiServer.handleRequest(ApiServer.java:422)
        at com.cloud.api.ApiServlet.processRequest(ApiServlet.java:304)
        at com.cloud.api.ApiServlet.doGet(ApiServlet.java:63)
        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:889)
        at 
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:721)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2268)
        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:679)
2012-09-25 12:35:20,879 WARN  [cloud.api.ApiDispatcher] (catalina-exec-17:null) 
class com.cloud.api.ServerApiException : Unable to add the host
2012-09-25 12:35:30,140 DEBUG [cloud.consoleproxy.ConsoleProxyManagerImpl] 
(consoleproxy-1:null) Skip capacity scan due to there is no Primary Storage 
UPintenance mode
2012-09-25 12:35:30,667 DEBUG 
[network.router.VirtualNetworkApplianceManagerImpl] 
(RouterStatusMonitor-1:null) Found 0 routers.
2012-09-25 12:35:37,395 INFO  [cloud.resource.ResourceManagerImpl] 
(catalina-exec-19:null) Trying to add a new host athttp://10.102.125.13 in data 
center 1
2012-09-25 12:35:37,543 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-19:null) 
Executing cmd: lsmod|grep kvm
2012-09-25 12:35:39,694 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-19:null) 
Executing cmd: lsmod|grep kvm
2012-09-25 12:35:41,751 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-19:null) 
Executing cmd: lsmod|grep kvm
2012-09-25 12:35:43,807 DEBUG [kvm.discoverer.KvmServerDiscoverer] 
(catalina-exec-19:null) It's not a KVM enabled machine
2012-09-25 12:35:43,807 WARN  [cloud.resource.ResourceManagerImpl] 
(catalina-exec-19:null) Unable to find the server resources at 
http://10.102.125.13
2012-09-25 12:35:43,808 WARN  [api.commands.AddHostCmd] (catalina-exec-19:null) 
Exception:
com.cloud.exception.DiscoveryException: Unable to add the host
        at 
com.cloud.resource.ResourceManagerImpl.discoverHostsFull(ResourceManagerImpl.java:737)
        at 
com.cloud.resource.ResourceManagerImpl.discoverHosts(ResourceManagerImpl.java:544)
        at com.cloud.api.commands.AddHostCmd.execute(AddHostCmd.java:140)
        at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:138)
        at com.cloud.api.ApiServer.queueCommand(ApiServer.java:543)
        at com.cloud.api.ApiServer.handleRequest(ApiServer.java:422)
        at com.cloud.api.ApiServlet.processRequest(ApiServlet.java:304)
        at com.cloud.api.ApiServlet.doGet(ApiServlet.java:63)
        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:889)
        at 
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:721)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2268)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:679)
2012-09-25 12:35:43,810 WARN  [cloud.api.ApiDispatcher] (catalina-exec-19:null) 
class com.cloud.api.ServerApiException : Unable to add the host
2012-09-25 12:35:44,697 DEBUG [cloud.server.StatsCollector] 
(StatsCollector-2:null) HostStatsCollector is running...
2012-09-25 12:35:44,707 DEBUG [cloud.server.StatsCollector] 
(StatsCollector-3:null) VmStatsCollector is running...
2012-09-25 12:35:44,708 DEBUG [cloud.server.StatsCollector] 
(StatsCollector-1:null) StorageCollector is running...



But when we restart the host and add again then the host gets added and we 
don’t see any such error. We have seen this consistently with last few ASF 
builds.
Is this an expected behavior??

Environment :
Management server  : Rhel 6.3
Host : KVM (Rhel 6.3)
ASF build : [Git Revision: dec69146cac7c064e2596a1a13c86015f0c4cd0a Git URL: 
https://git-wip-us.apache.org/repos/asf/incubator-cloudstack.git] 
------------------  
http://jenkins.cloudstack.org/job/build-4.0-rhel63/lastSuccessfulBuild/artifact/CloudStack-oss-4.0.0-156.tar.bz2

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