[ovirt-users] Add multiple files to a VM via cloud-init
Branimir Pejakovic
branimirp at gmail.com
Thu Nov 6 05:06:24 EST 2014
On Mon, Nov 3, 2014 at 8:52 PM, Branimir Pejakovic <branimirp at gmail.com>
wrote:
>
>
> On Fri, Oct 31, 2014 at 11:00 PM, Juan Hernandez <jhernand at redhat.com>
> wrote:
>
>> On 10/31/2014 06:47 PM, Branimir Pejakovic wrote:
>> >
>> >
>> >
>> > On Thu, Oct 30, 2014 at 12:52 PM, Branimir Pejakovic
>> > <branimirp at gmail.com <mailto:branimirp at gmail.com>> wrote:
>> >
>> >
>> >
>> > On Thu, Oct 30, 2014 at 12:39 PM, Shahar Havivi <shaharh at redhat.com
>> > <mailto: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 <mailto: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 <mailto: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 <http://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
>> >
>>
>> The "custom_script" element doesn't work in combination with cloud-init
>> and run once. To make it work you have to use cloud-init and a file
>> element containing your custom script. Here you have an example:
>>
>> #!/usr/bin/python
>>
>> import base64
>> import re
>>
>> from ovirtsdk.api import API
>> from ovirtsdk.xml import params
>>
>> # A simple function to encode using base64 and now new lines:
>> def encode(s):
>> return re.sub("\s+", "", base64.encodestring(s))
>>
>> # Connect to the server:
>> api = API(
>> url="https://engine35.example.com/ovirt-engine/api",
>> username="admin at internal",
>> password="redhat123",
>> insecure=True,
>> debug=True
>> )
>>
>> # Find the virtual machine:
>> myvm = api.vms.get(name="myvm")
>>
>> # Prepare the cloud-init custom script to write files:
>> myscript = """\
>> write_files:
>> """
>>
>> # Append one file:
>> myscript += """\
>> - encoding: b64
>> content: %s
>> owner: root:root
>> path: /etc/firstfile.txt
>> permissions: '0644'
>> """ % encode("The content of the first file")
>>
>> # Append another file:
>> myscript += """\
>> - encoding: b64
>> content: %s
>> owner: root:root
>> path: /etc/secondfile.txt
>> permissions: '0644'
>> """ % encode("The content of the second file")
>>
>> # Prepare the action to trigger initialization using cloud-init:
>> action = params.Action(
>> vm=params.VM(
>> initialization=params.Initialization(
>> cloud_init=params.CloudInit(
>> files=params.Files(
>> file=[
>> params.File(
>> name="myscript",
>> type_="plaintext",
>> content=myscript
>> )
>> ]
>> )
>> )
>> )
>> )
>> )
>>
>> # Start the virtual machine:
>> myvm.start(action)
>>
>> # Disconnect from the server:
>> api.disconnect()
>>
>> Regarding the problem with the root password we have a bug in 3.5 that
>> makes this fail. See here:
>>
>> https://bugzilla.redhat.com/1156155
>>
>> The problem is that we are not passing the user name to cloud-init, and
>> as a result it is changing the default cloud-init user password, not the
>> root pssword. To workaround the issue you can edit the
>> "/etc/cloud/cloud.cfg" file of the VM and change the default user name:
>>
>> system_info:
>> distro: ...
>> default_user:
>> name: root <-- Change this from "fedora" or "cloud-init" to root
>>
>> --
>> 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.
>>
>
>
> Hi Juan,
>
> Sorry for the delay. Thank you very much for this. It works perfectly.
>
> Best regards,
>
> Branimir
>
>
>
Hi,
I just want to ask one more thing - is it possible to rename virtual disk
from template_disk1 to vm1_disk1. I am asking this because I create vms
based on the template and every machine I create has the same disk template
name.
Of course, I have searched through list archives and found this:
http://lists.ovirt.org/pipermail/users/2014-June/024993.html
https://bugzilla.redhat.com/show_bug.cgi?id=1105887
According to bugzilla this feature is targeted for 3.6 release. Is there
any workaround maybe for this in 3.5 in Python SDK?
Thank you!
Best regards,
Branimir
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