[ovirt-users] Add multiple files to a VM via cloud-init

Fri Oct 31 17:47:41 UTC 2014

On Thu, Oct 30, 2014 at 12:52 PM, Branimir Pejakovic <branimirp at gmail.com>
wrote:

>
>
> On Thu, Oct 30, 2014 at 12:39 PM, Shahar Havivi <shaharh at redhat.com>
> wrote:
>
>> On 30.10.14 12:30, Branimir Pejakovic wrote:
>> > On Thu, Oct 30, 2014 at 12:02 PM, Shahar Havivi <shaharh at redhat.com>
>> wrote:
>> >
>> > > On 30.10.14 10:06, Branimir Pejakovic wrote:
>> > > > On Thu, Oct 30, 2014 at 7:22 AM, Shahar Havivi <shaharh at redhat.com>
>> > > wrote:
>> > > >
>> > > > > On 29.10.14 17:35, Branimir Pejakovic wrote:
>> > > > > > Hi list,
>> > > > > >
>> > > > > > I was wondering is there a way to add multiple files to a vm via
>> > > > > cloud-init
>> > > > > > using python SDK. I was able to add /etc/resolv.conf and
>> > > additionally I
>> > > > > > would like to add config files for NICs (ifcfg-ethX) with
>> appropriate
>> > > > > > values (ip,gw,netmask). I used an example given here:
>> > > > > > http://www.ovirt.org/Features/Cloud-Init_Integration . But
>> > > > > unfortunately I
>> > > > > > cannot do the same thing If I want to write multiple files to a
>> vm in
>> > > > > > params.Action class.
>> > > > > >
>> > > > > > Thank you in advance!
>> > > > > you can use the custom script text box in oVirts cloud-init
>> section,
>> > > > > there you can add any cloud-init section - adding files examples
>> can be
>> > > > > found
>> > > > > here:
>> > > > >
>> > > > >
>> > >
>> http://cloudinit.readthedocs.org/en/latest/topics/examples.html#writing-out-arbitrary-files
>> > > > >
>> > > > >   Shahar Havivi.
>> > > > >
>> > > > >
>> > > > Hi Shahar,
>> > > >
>> > > > Thank you for the reply.
>> > > >
>> > > > To be honest I knew for those scripts but I want to do it in
>> automate
>> > > > fashion just like in that example that I put in my original
>> message. I
>> > > have
>> > > > tried to specify in params.Files class multiple files:
>> > > >
>> > > > vm_file1 = params.Files(file=[params.File(name = 'file1', content =
>> > > > file1_content, type_= 'PLAINTEXT')])
>> > > > vm_file2 = params.Files(file=[params.File(name = 'file2', content =
>> > > > file2_content, type_= 'PLAINTEXT')])
>> > > >
>> > > > and then give them as arguments to params.CloudInit _init_
>> constructor
>> > > > (files=...)  just like in that example above but it seems that I am
>> doing
>> > > > something wrong because it does not write multiple files - it
>> writes only
>> > > > when you specify one file all right. The exception is "Error: 'list'
>> > > object
>> > > > has no attribute 'export'" (I tried to specify those files as a
>> list -
>> > > > files=[vm_file1,vm_file2]).
>> > > >
>> > > > Thanks for any help.
>> > > The custom script is currently the only option to add files via
>> Cloud-Init
>> > >
>> > > Thanks,
>> > >   Shahar Havivi.
>> > >
>> > >
>> > Hi Shahar,
>> >
>> > Granted. But the example in python
>> > http://www.ovirt.org/Features/Cloud-Init_Integration uses custom
>> script :)
>> > I just want to know how to do the same thing in case when I want to
>> write
>> > more than one file to a VM - and yes  - all those multiple files that I
>> > want to write are specified via custom scripts.
>> >
>> > From the link - (The "Python SDK" paragraph: scontent object holds the
>> > custom script):
>> >
>> >  scontent = "write_files:\n-   content: |\n        search
>> > example.com\n        nameserver 10.10.10.1\n        nameserver
>> > 10.10.10.2\n    path: /etc/resolv.conf"
>> >
>> > For example (and just for example), I want to write to /etc/issue and
>> > /etc/hosts not only /etc/resolv.conf. In essence, when vm goes to
>> run-once
>> > mode I want to write more than one file to a vm via Python (using
>> > CloudInit) in automated fashion (and not touching oVirt GUI at all).
>> You don't need to use the GUI,
>> the sdks initialization have custom_script as string which is equivalent
>> to
>> the text box that you see in the GUI, and you can put the same content
>> there
>> (ie multiple files).
>> Is that sufficient enough?
>>
>
> Hi Shahar,
>
> Thanks! I will try this one. I was not aware of this feature. Although I
> can see that it was mentioned on the list (my bad).
>
> Thank you for your effort! I really do appreciate it!
>

Hi,

Please if somebody can help me because I am pretty stuck. As I said in
previous posts I used this Python example
http://www.ovirt.org/Features/Cloud-Init_Integration to set root password,
hostname and resolv.conf. It worked without any problems for 3.4 oVirt
version and equivalent Python SDK (ovirt-engine-sdk-python-3.4.x.noarch).

Then, I have tried to write through yuml scripts more conf files than just
resolv.conf to configure guest. I also saw this post on the list:
http://lists.ovirt.org/pipermail/users/2014-October/028539.html. So based
on that, I decided to upgraded oVirt and SDK
(ovirt-engine-sdk-python-3.5.0.7-1.el6.noarch) to 3.5 version. The upgrade
itself passed without any problem.

>From that point forward I tried to use custom_script parameter (as
suggested by Shahar) inside Initialization class and CloudInit class
without any luck.

Can somebody please provide a simple Python code to submit yaml script to
cloud-init?

Also after the upgrade the example script I mentioned above can only change
hostname. It does not write resolv.conf anymore nor it sets root password.
I don't know if something is changed inside methods? For example,
customization of virtual machine (memory,cpu,high availability, pinning to
a certain host etc works without any problems).

Thank you!

Best regards,

Branimir
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