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Igor,

I'm trying to figure out where the failure is. The 5.1.1 and 6.0
prebuilt containers contain the correct version of nailgun RPM
pre-installed. It shouldn't matter if the versions are identical
(which is a problem for sure).

Can you open a bug and post upgrade logs? I'm interested to see which
pieces cause the failure and this is some area I didn't plan for in
container upgrades.

Best Regards,
Matthew Mosesohn

On Fri, Nov 14, 2014 at 3:43 PM, Igor Kalnitsky <ikalnitsky at mirantis.com> wrote:
> Hi folks,
>
> Yesterday I performed the following upgrade chain:
>
>     5.1 -> 5.1.1 -> 6.0
>
> and upgrading to 6.0 was failed. I did some research and figure out
> that Nailgun's container doesn't have Nailgun at all. So here's what
> happened.
>
> 1. When we're upgrading to 6.0 we already have three repos in the
> system: 5.1, 5.1.1 and 6.0.
>
> 2. When we start a new Nailgun container, it runs start.sh which runs
> puppet [1].
>
> 3. And puppet fails to install a Nailgun package. Why it's happened?
> We have the same Nailgun version in both 5.1.1 and 6.0 repos, but
> those packages have different dependencies. From yum's point of view,
> the packages are same (since they have the same version), so yum tries
> to install the Nailgun from 5.1.1 repo, but the container contains
> already installed dependencies for the Nailgun from 6.0 (they were
> installed during building container), and obviously it fails with
> failed dependencies errors (we have higher versions in the system).
>
> Well, the issue blocks complex upgrade chains and definitely we have
> to do something ASAP.
>
> In order to protect us from similar issues in future I propose next changes:
>
> 1. Increase versions of all Fuel packages at least once per release.
>
> 2. Remove a package installation code from manifests - the container
> should not install packages, they should be installed during container
> building process.
>
> What do you think, folks?
>
>
> [1]: https://github.com/stackforge/fuel-main/blob/master/docker/nailgun/start.sh#L11
>
> Thanks,
> Igor
>
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