[ovirt-users] cloud-init options under python-sdk

[Juan Hernandez]

On 07/22/2014 02:55 PM, Amedeo Salvati wrote:
> hi Juan|guys,
> 
> thanks for hints! but unfortunatly it seems wont works, because I've
> launched vm with this simple code:
> 
> action =
> params.Action(vm=params.VM(initialization=params.Initialization(cloud_init=params.CloudInit(host=params.Host(name="rheltest014")))))
> vm.start( action )
> 
> but after boot the VM, cloud-init service hasn't set hostname and on
> cloud-init.log and cloud-init-output.log I cannot find any entry for
> setting hostname, instead if I use web ui it work's fine...
> 
> there are any ways to debug cloud-init jobs?
> the params params.Host is right for CloudInit host or is intended for
> host / hypervisor?
> 
> Best regards
> Amedeo Salvati
> 

To change the hostname you have to use the "address" property of the
"Host" class:

  host=params.Host(
      address="myhostname.example.com"
  )

The "Host" class is used for many things, including CloudInit and
hypervisors. But in this context it is just a container for the host name.

To debug cloud-init start the VM (with the GUI or with the RESTAPI),
then go to the hypervisor where it is actually running, and look for the
corresponding qemu-kvm process:

  # ps -ef | grep qemu-kvm | grep myvm

The qemu-kvm command line will have a parameter indicating the file that
contains the cloud-init data:

  -drive file=/var/run/vdsm/payload/...img

Copy that file somewhere, then mount it and inspect the content:

  # cp /var/run/vdsm/payload/...img /tmp/my.img
  # mount -o loop,ro /tmp/my.img /mnt
  # find /mnt
  ...
  # umount /mnt


> Da: "Juan Hernandez" jhernand at redhat.com
> A: "Amedeo Salvati" amedeo at oscert.net, users at ovirt.org
> Cc:
> Data: Tue, 22 Jul 2014 12:21:01 +0200
> Oggetto: Re: [ovirt-users] cloud-init options under python-sdk
> 
>> On 07/22/2014 11:48 AM, Amedeo Salvati wrote:
>> > hello guys!
>> >
>> > I'm writing some python code to start VMs, and based on operating system
>> > (at this moment centos6 nad centos7), I would like to use cloud-init
>> > options (available on web ui at run-once) to start them and resetting
>> > root password, change hostname and write some configuration files by
>> > using yaml semantics, but at this moment I was unable to find a way to
>> > do it...
>> >
>> > somebody know a way (or could send me some hints) using python-sdk to
>> > start A VM and pass to it cloud-init options?
>> >
>> > e.g. the portion of code I would like to change is vm.start() under
> rhel6|7:
>> >
>> > try:
>> > osVersion = vm.get_os().get_type()
>> > if (osVersion == "rhel_6x64" or osVersion == "rhel_6" or
>> > osVersion == "rhel_7x64") and CLOUDINIT == "yes":
>> > print "Starting VM: " + vm.name + " with cloud-init
>> > options"
>> > ----> vm.start() <---------- > else:
>> > print "Starting VM " + vm.name
>> > vm.start()
>> > while vmstat != 'down':
>> > sleep(1)
>> > vmstat = vm.get_status().state
>> > except Exception, err:
>> > print "Error on starting VM"
>> > print err
>> >
>> >
>> > Best regards
>> > Amedeo Salvati
>> >
>>
>> It should be something like this:
>>
>> from ovirtsdk.xml import params
>>
>> action = params.Action(
>> vm=params.VM(
>> initialization=params.Initialization(
>> cloud_init=params.CloudInit(
>> host=params.Host(
>> name="myvm"
>> ),
>> users=...,
>> files=...,
>> ...
>> )
>> )
>> )
>> )
>>
>> vm.start(action)
>>
>>
>> --
>> Dirección Comercial: C/Jose Bardasano Baos, 9, Edif. Gorbea 3, planta
>> 3ºD, 28016 Madrid, Spain
>> Inscrita en el Reg. Mercantil de Madrid – C.I.F. B82657941 - Red Hat S.L.


-- 
Dirección Comercial: C/Jose Bardasano Baos, 9, Edif. Gorbea 3, planta
3ºD, 28016 Madrid, Spain
Inscrita en el Reg. Mercantil de Madrid – C.I.F. B82657941 - Red Hat S.L.