[ovirt-users] How to use ovirt-guest-agent without VDSM?

[Adam Litke]

On 09/09/15 18:58 +0800, Nick Xiao wrote:
>In my environment i want to use ovirt-ga replace qemu-ga.
>  Hypervisor is Ubuntu 14.04 (OpenStack Icehouse) and the virtual machine
>is Ubuntu 14.04 cloudimage.
>
>In Hypervisor launch a instance and attach a chardev, like:
># ps -ef | grep guest_agent
>libvirt+   2649      1  1 Sep08 ?        00:15:36
>/usr/bin/qemu-system-x86_64 ...
>-chardev
>socket,id=charchannel0,path=/var/lib/libvirt/qemu/org.qemu.guest_agent.0.instance-00000210.sock,server,nowait
>-device
>virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
>...
>
>In virtual machine was installed ovirt-guest-agent 1.0.11-1.1 and service
>running OK.
>
>But i don't know how to get memory usage and other information in
>hypervisor(OpenStack compute node)? I have failed when i try to use linux
>command 'socat' and python socket.
>
>I need some sample or link.

I took a look at the libvirt domain XML from one of my running oVirt
VMs and found the following device:

    <channel type='unix'>
      <source mode='bind'
path='/var/lib/libvirt/qemu/channels/14182ea9-c01f-428d-ac67-5a7e2639c931.com.redhat.rhevm.vdsm'/>
      <target type='virtio' name='com.redhat.rhevm.vdsm'
state='disconnected'/>
      <alias name='channel0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>

You might try adding this to your VM.  I'm almost certain that
ovirt-ga searches for a device with the name 'com.redhat.rhevm.vdsm'
when starting up.  Once you are connected, take a look at
vdsm/virt/guestagent.py in the vdsm source code for hints about how to
talk to the agent.

-- 
Adam Litke