Cloudstack Libvirt and KVM issues after hard reboot

CentOS 6.4, CloudStack 4.2

I just had to force server reboot over IPMI (with few KVM VMs running), and after server booted, I could not start some of those VMs, from CloudStack UI.

After looking into cloudstack-agent log (/var/log/cloudstack/agent/agent.log), I found this suspicious errors:

2013-10-23 01:55:22,127 WARN [kvm.resource.LibvirtComputingResource] (agentRequest-Handler-3:null) LibvirtException
org.libvirt.LibvirtException: operation failed: domain 'i-6-76-VM' already exists with uuid 56225e11-d3e1-33b8-a18f-3763d3481192
 at org.libvirt.ErrorHandler.processError(Unknown Source)
 at org.libvirt.Connect.processError(Unknown Source)
 at org.libvirt.Connect.domainCreateXML(Unknown Source)

It seems like the qemu did not do it’s clean up, so you need to manually delte all .xml files in /etc/libvirt/qemu/  folder:

rm /etc/libvirt/qemu/*.xml

Restart libvirtd,  and after that, you will be able to start your VMs again.

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