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

Branimir Pejakovic branimirp at gmail.com
Fri Nov 7 22:25:15 UTC 2014


On Thu, Nov 6, 2014 at 10:21 AM, Juan Hernandez <jhernand at redhat.com> wrote:

> On 11/06/2014 11:06 AM, Branimir Pejakovic wrote:
> >
> > On Mon, Nov 3, 2014 at 8:52 PM, Branimir Pejakovic <branimirp at gmail.com
> > <mailto:branimirp at gmail.com>> wrote:
> >
> >
> >
> >     On Fri, Oct 31, 2014 at 11:00 PM, Juan Hernandez
> >     <jhernand at redhat.com <mailto: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>
> >         <mailto: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>
> >         >     <mailto: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>
> >         <mailto: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>
> >         <mailto: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>
> >         <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
> >
>
> You can rename the disks after the virtual machine is created:
>
> vm = api.vms.get(name="myvm")
> index = 0
> for disk in vm.disks.list():
>     disk.set_alias("myvm_disk_%d" % index)
>     disk.update()
>     index += 1
>
>


Hi Juan,


Thanks a lot! Works perfectly!

Branimir
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