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TB-SUPPORT  October 2016

TB-SUPPORT October 2016

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Subject:

Re: Change to Approved VOs (and RPMs)

From:

Stephen Jones <[log in to unmask]>

Reply-To:

Testbed Support for GridPP member institutes <[log in to unmask]>

Date:

Fri, 21 Oct 2016 16:13:43 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (94 lines)

Hi David,

I thinking about what you said, but I'm afraid it's blown my mind ...

Cheers,

Ste


On 10/21/2016 02:03 PM, David Crooks wrote:
> Hi Steve,
>
> Chipping in from the side (but we are also thinking separately about this kind of thing) this feels like the CA distribution case, where you have a metapackage that is distributed every so often which contains like-numbered RPM packages. In this case it feels like having an approved-vo metapackage with a set of rpms, all of which are the same version, is the way to go. If you don’t want to install all the approved-vo rpms that’s fine, but making sure you’re up to date by checking the package version is efficient, and also similar to something else we already do.
>
> Cheers,
> David
>
> On 21/10/2016, 13:33, "Testbed Support for GridPP member institutes on behalf of Stephen Jones" <[log in to unmask] on behalf of [log in to unmask]> wrote:
>
>      On 10/20/2016 07:22 PM, Marcus Ebert wrote:
>      > I use them, but we do not support VOs that had recent changes. While
>      > the initial setup and install worked fine and without any problems, I
>      > can't comment right now on how it goes with updates. I'll let you know
>      > about that once there have been changes to the VO-rpms that we support
>      > in Edinburgh.
>      
>      Hi Marcus,
>      
>      If you use them, then I'd like your advice. There are two ways to manage
>      the versioning.
>      
>      The way I have chosen is this: whenever ANY approved VO changes, all the
>      VO RPMs get released with a new version stamp. The reason for this is
>      both practical (it's easy to do) and technical. The technical reason is
>      that the Approved VOs document now has a version number. And if any
>      Approved VO changes, the document version is updated. Thus, if ALL of
>      the RPMs on your site match the document number, then your site is up to
>      date.
>      
>      The alternative would be: whenever an approved VO changes, only that VO
>      RPM that has changed would  get released with the new version stamp. The
>      others would remain as they were.  And the Approved VO Document gets the
>      new version stamp. Thus to check if your site is up to date, you would
>      have to check which VO supported (if any) at your site  changed and make
>      sure just its RPM is up to date. Sometimes, if none changed, your site
>      would have RPMs where all their version numbers match a stale version of
>      the document!
>      
>      So, it is harder to be sure you are up to date with the second scheme.
>      But, with the first scheme, you will update "unnecessarily" (i.e. the
>      contents of the RPM may be unchanged, but the version number will have
>      changed and an update will occur if version=latest, in your puppet
>      config). I consider the latter effect to be of negligible impact.
>      
>      So those are the options -
>      
>      a) shotgun solution, that causes more updates but which are negligible,
>      
>      or
>      
>      b) precise solution, that is harder to verify against and, perhaps,
>      harder to understand.
>      
>      Which do you prefer? Or is there another option? (I can think of one,
>      but I don't like it!)
>      
>      Cheers,
>      
>      Ste
>      
>      
>      
>      
>      
>      
>      
>      
>      
>      --
>      Steve Jones                             [log in to unmask]
>      Grid System Administrator               office: 220
>      High Energy Physics Division            tel (int): 43396
>      Oliver Lodge Laboratory                 tel (ext): +44 (0)151 794 3396
>      University of Liverpool                 http://www.liv.ac.uk/physics/hep/
>      
>


-- 
Steve Jones                             [log in to unmask]
Grid System Administrator               office: 220
High Energy Physics Division            tel (int): 43396
Oliver Lodge Laboratory                 tel (ext): +44 (0)151 794 3396
University of Liverpool                 http://www.liv.ac.uk/physics/hep/

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