[Openstack-operators] Migration Openstack Instances and cloud-init

Achi Hamza h16mara at gmail.com
Tue Jul 5 12:24:09 UTC 2016


Thank you for sharing your findings :).

On 5 July 2016 at 13:00, Michael Stang <michael.stang at dhbw-mannheim.de>
wrote:

> Hi Hamza,
>
> thank you for your answere. I learnd much about the cloud-init in this
> process.
>
> I found now a way to config this without maipulating the cloud.cfg on the
> intance directly. I start the new instance from the copied snapshot with
> user-data I can inject over the "configurations" tab of a new openstack
> instance. I use the following config for this:
>
>
> #cloud-config
> password: <password_default_user>
> chpasswd: { expire: False }
> ssh_pwauth: True
> preserve_hostname: True
>
>
> I think I can do some more options which may be useful, but this works
> fine for me by now :-)
>
> Kind regards,
> Michael
>
>
> Achi Hamza <h16mara at gmail.com> hat am 5. Juli 2016 um 12:36 geschrieben:
>
>
> Hi Michael,
>
> Yes, you can comment out the modules that you don't need.
>
> I don't think it is a good idea to completely disable cloud-init
> functionality. If you do so, the instances wouldn't be able to
> automatically set hostnames, disk resize, SSH keys injection and more other
> benefits.
>
> If you would like to use password for authentication you need to change
> the property *lock_passwd: True* to *lock_passwd: False *under the
> section *system_info* in the /etc/cloud/cloud.cfg config file.
>
> I do not actually know what process invokes cloud-init.
>
> I hope the above helps.
>
> Regards,
> Hamza
>
> On 4 July 2016 at 08:31, Michael Stang <michael.stang at dhbw-mannheim.de>
> wrote:
>
> Hi Hamza,
>
> thank you for your answere. So I have to comment out the modules i don't
> want to run when I understand this right?
>
> Why are the changes made to the instance when I start a snapshot of the
> instance and not every time when I start the instance itself? What event
> triggers the cloud-init to make this changes?
>
> What would happen when I remove the cloud-init package, will the instance
> still be working and what disadventages would I have then?
>
> Thank you and kind regards,
> Michael
>
>
>
> Achi Hamza <h16mara at gmail.com> hat am 2. Juli 2016 um 14:30 geschrieben:
>
>
> Hi Michael,
>
> You can change this behavior in the /*etc*/*cloud*/*cloud*.cfg config
> file.
>
> Regards,
> Hamza
>
> On 1 July 2016 at 07:02, Michael Stang <michael.stang at dhbw-mannheim.de>
> wrote:
>
> Hi all,
>
> I tried to copy instances (based on the ubuntu cloud image) from our
> production cloud to our test cloud according to this description
>
>
> http://docs.openstack.org/user-guide/cli_use_snapshots_to_migrate_instances.html
>
> but when I start the instance on the test cloud the root password ist
> resetet and it seems that the cloud-init is invoked and change the instance
> like it is the first start. Is there a way to prevent this behaviour so the
> instance stays unchanged when I start it on the test cloud?
>
> Thanks and kind regards,
> Michael
>
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>
>
>
> Viele Grüße
>
> Michael Stang
> Laboringenieur, Dipl. Inf. (FH)
>
> Duale Hochschule Baden-Württemberg Mannheim
> Baden-Wuerttemberg Cooperative State University Mannheim
> ZeMath Zentrum für mathematisch-naturwissenschaftliches Basiswissen
> Fachbereich Informatik, Fakultät Technik
> Coblitzallee 1-9
> 68163 Mannheim
>
> Tel.: +49 (0)621 4105 - 1367
> michael.stang at dhbw-mannheim.de
> http://www.dhbw-mannheim.de
>
>
>
>
>
>
>
>
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