Ubuntu 14.04 : qemu-guest-agent

Here are trial and error logs when setting up qemu-guest-agent.

KVM host : Ubuntu 14.04

Guest VMs : CentOS 6.6

KVM host

# uname –r 3.13.0-37-generic # kvm --version QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.7), Copyright (c) 2003-2008 Fabrice Bellard

install qemu-guest-agent on the VM.

# yum install qemu-guest-agent # /etc/init.d/qemu-ga start # /etc/init.d/qemu-ga status qemu-ga is stopped

can not start qemu-ga.

reboot the VM.

# reboot # /etc/init.d/qemu-ga status qemu-ga is stopped

nnn, still can not start qemu-agent.

I forgot adding a channel for qemu-agent.

add following lines to the VM’s xml file.

<channel type='unix'>      <source mode='bind' path='/var/lib/libvirt/qemu/centos6-vm.agent'/>      <target type='virtio' name='org.qemu.guest_agent.0'/>      <alias name='channel1'/>      <address type='virtio-serial' controller='0' bus='0' port='2'/>    </channel>

Here is an output of diff of VM’s xml file.

# diff /etc/libvirt/qemu/centos6-vm.xml /etc/libvirt/qemu/centos6-vm.xml.org 42,44d41 <     <controller type='virtio-serial' index='0'> <       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> <     </controller> 57,61d53 <     <channel type='unix'> <       <source mode='bind' path='/var/lib/libvirt/qemu/centos6-vm.agent'/> <       <target type='virtio' name='org.qemu.guest_agent.0'/> <       <address type='virtio-serial' controller='0' bus='0' port='2'/> <     </channel>

Okay, qemu-ga is running on the VM.

# /etc/init.d/qemu-ga status qemu-ga (pid  1086) is running...

on the KVM host

virsh # qemu-agent-command centos6-vm '{"execute":"guest-network-get-interfaces"}' {"return":[{"name":"lo","ip-addresses":[{"ip-address-type":"ipv4","ip-address":"127.0.0.1","prefix":8}],"hardware-address":"00:00:00:00:00:00"},{"name":"eth0","ip-addresses":[{"ip-address-type":"ipv4","ip-address":"192.168.122.53","prefix":24}],"hardware-address":"MAC address"}]}

I was able to get information via qemu-agent-command.