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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/cloudcloudstack/agent/log4j-cloud.xml

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

   Code Block
   $lsmod | grep kvm

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

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

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

How to debug the KVM Agent on 4.2 and RHEL 6.3

kvm agent is running with jsvc tool.

To run the kvm agent in debug mode.

in /etc/init.d/cloudstack-agent
start() method
add -Xrunjdwp:transport=dt_socket,address=8787 after $JSVC.

it will be like $JSVC -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n -cp "$CLASSPATH"

add rule to allow 8787 port in kvm host.

iptables  -I INPUT -p tcp --dport 8787 --j ACCEPT (on Rhel 6.3)

restart the management server. check the port 8787 using netstat -atnp | grep jsvc

connect the debugger from eclipse.