issue with k5start

Kristen Webb kwebb at teradactyl.com
Mon Oct 8 16:15:11 EDT 2018


Hi Everyone,

Thank you all for the online and offline responses.  Unfortunately, as I
have learned,
k5start or any other mechanism will not keep a vos dump moving beyond the
inital
lifetime grated to the token controlled by the kerberos configuration.  So,
for example,
if I want a 1 week lifetime for very long running jobs as tibs at REALM I need
to set:

1. In kdc.conf or equivalent:

max_life = 168h 0m 0s

2. Set all the appropriate max lifetimes in the KDB (modprinc -maxlife
168hours)

krbtgt/REALM
backup_admin at REALM
afs/cell at REALM

Then kinit/aklog is sufficient, k5start is nice for dealing with CCACHE
names, but will
not keep things running any longer.  Someone mentioned GSSproxy.  I have
not had
time to look at this closer, but I suspect it may not help with the vos
command in particular.

Kris


On Tue, Sep 25, 2018 at 3:11 PM Russ Allbery <eagle at eyrie.org> wrote:

> Kristen Webb <kwebb at teradactyl.com> writes:
>
> > When I use the -k ccache option it appears that each job simply
> > overwrites the cchache file.
>
> It should only do this if the ticket is going to expire sooner than two
> minutes before the next wake-up period, though, I think?  I would have
> expected this to work with all jobs sharing the same cache file, as long
> as they're at least a little staggered.  That said, I don't think I've
> really tested for this sort of parallelism, and it's entirely possible
> that the separate k5start processes don't manage coordination between each
> other on the same ticket cache properly.
>
> > Is there a way to use k5start to achieve what I am after
> >      - shared ccache for many jobs to keep kerberos server traffic down
> >      - allow long running jobs to continue beyond their initial aklog
> > renewal date
>
> > If I ran k5start as a daemon and managed periodic aklog's within my
> > application, would that work?
>
> Yes, that's what I was going to suggest.  If each application is running
> in a separate PAG, each application needs to run aklog periodically
> independently of the others.  If you also want to share a single ticket
> cache among the applications, you probably want to split those two
> operations.
>
> Unfortunately, k5start doesn't currently have a mode of operation in which
> it only runs the aklog command but doesn't try to renew tickets if they
> aren't about to expire.
>
> --
> Russ Allbery (eagle at eyrie.org)              <http://www.eyrie.org/~eagle/>
>


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Mr. Kristen J. Webb
Chief Technology Officer
Teradactyl LLC.
2450 Baylor Dr. S.E.
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Phone: 1-505-338-6000
Email: kwebb at teradactyl.com
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