[Openstack-operators] How to handle updates of public images?
alopgeek at gmail.com
Thu Feb 5 14:02:13 UTC 2015
I always recommend the following:
All public images are named generically enough that they can be replaced
with a new version of the same name. This helps new instances booting.
The prior image is renamed with -OLD-$date. This lets users know that their
image has been deprecated. This image is made private so no new instances
can be launched.
All images include an updated motd that indicates available security
We're discussing baking the images with automatic updates, but still
haven't reached an agreement.
On Thursday, February 5, 2015, Tim Bell <Tim.Bell at cern.ch> wrote:
> > -----Original Message-----
> > Sent: 05 February 2015 14:10
> > Subject: [Openstack-operators] How to handle updates of public images?
> > Hello everyone.
> > We are updating our public images regularly (to provide them to
> customers in
> > up-to-date state). But there is a problem: If some instance starts from
> image it
> > becomes 'used'. That means:
> > * That image is used as _base for nova
> > * If instance is reverted this image is used to recreate instance's disk
> > * If instance is rescued this image is used as rescue base
> > * It is redownloaded during resize/migration (on a new compute node)
> > One more (our specific):
> > We're using raw disks with _base on slow SATA drives (in comparison to
> fast SSD
> > for disks), and if that SATA fails, we replace it (and nova redownloads
> stuff in
> > _base).
> > If image is deleted, it causes problems with nova (nova can't download
> > The second part of the problem: glance disallows to update image (upload
> > image with same ID), so we're forced to upload updated image with new ID
> > to remove the old one. This causes problems described above.
> > And if tenant boots from own snapshot and removes snapshot without
> > instance, it causes same problem even without our activity.
> > How do you handle public image updates in your case?
> We have a similar problem. For the Horizon based end users, we've defined
> a panel using image meta data. Details are at
> For the CLI users, we propose to use the sort options from Glance to find
> the latest image of a particular OS.
> It would be good if there was a way of marking an image as hidden so that
> it can still be used for snapshots/migration but would not be shown in
> image list operations.
> > Thanks!
> > _______________________________________________
> > OpenStack-operators mailing list
> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
> OpenStack-operators mailing list
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the OpenStack-operators