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If there are issues around KVM hypervisor in CloudStack, better to have the following information when reports issues/bugs and or bringing the issue to the mailing lists:

1. Which KVM host OS is being used? Centos 6.2, 6,1, Ubuntu 10.04/12.04? 
2. Which version of libvirt is using, "virsh --version"
3. Turn the agent log level to debug:

   Code Block
   $sed -i 's/INFO/DEBUG/g' /etc/cloudstack/agent/log4j-cloud.xml

4. Reproduce the issue, paste the /var/log/cloudstack/agent/agent.log to a pastebin
5. If adding kvm host failed, take a look at: /var/log/cloudstack/setupAgent.log
6. Ensure that virtualization modules are present on your host OS. Following shows KVM modules

   Code Block
   $lsmod | grep kvm

Steps to debug the KVM agent  from eclipse:

• In KVM agent  edit  ‘/usr/libexec/agent-runner ‘,

               add  "-Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n"   to ‘java -Xms128M -Xmx384M’  line

               java -Xms128M -Xmx384M -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n -cp "$CLASSPATH" "$@" com.cloud.agent.AgentShell $SERVICEARGS &2.

• Add the firewall rule in KVM host to accept the traffic on 8787 port.

              iptables  --I INPUT --p tcp --dport 8787 --j ACCEPT

• Then restart cloud-agent.

              service cloud(stack)-agent restart

• Verify that 8787 port is opened by java using  ‘netstat --napt’ command.

• Connect from eclipse Debug Configuration to to KVM host 8787 port for debugging.