How to configure and use qemu-guest-agent in Ubuntu 12.04? My main aim is to get the IP address of guest VM from Host machine

Solution 1:

1. First of all install latest version of libvirt-bin(>=1.0.0) on the host system. Installing libvirt-bin(>=1.0.0) on Ubuntu12.04 is itself a challenge because of dependencies.This link may help to do so: https://tad-do.net/2013/02/22/testing-new-libvirt-features-on-ubuntu-12-04/

   Then execute following commands on host:

   mkdir -p /var/lib/libvirt/qemu/channel/target
   chown -R libvirt-qemu:kvm /var/lib/libvirt/qemu/channel
   

2. Add the following to the bottom of /etc/apparmor.d/abstractions/libvirt-qemu:

   /var/lib/libvirt/qemu/channel/target/* rw,
   

3. Install qemu-guest-agent in guest VM.

   sudo apt-get install qemu-guest-agent
   

4. virsh edit VMNAME and add following lines in the devices:

   <channel type="unix">
     <source mode="bind"/>
     <target type="virtio" name="org.qemu.guest_agent.0"/>
   </channel>
   

5. Shutdown and start the VM and execute following command to get the IP Address. There are many other things which can be done using guest-agent.

   virsh qemu-agent-command VMNAME '{"execute":"guest-network-get-interfaces"}'
   

References:http://wiki.stoney-cloud.org/wiki/Qemu_Guest_Agent_Integration