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

22 Jul 2014

      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@redhat.com
A: "Amedeo Salvati" amedeo@oscert.net, users@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)
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-- 
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.