Question on renewable lifetime miguel.sanders at
Fri Mar 27 13:08:00 EDT 2009

Hi Greg

Thanks for the feedback.
Much appreciated! 

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E miguel.sanders at

-----Oorspronkelijk bericht-----
Van: Greg Hudson [mailto:ghudson at MIT.EDU] 
Verzonden: vrijdag 27 maart 2009 17:52
Aan: SANDERS Miguel
CC: kerberos at
Onderwerp: Re: Question on renewable lifetime

I would personally stick with using a supplied keytab.

If you do switch to renewing tickets, be aware that renewal has to happen while the old tickets are still valid.  If your crontab ever misses a renewal, it will break until you kinit again by hand.

The theoretical advantage of renewal over a known password is that renewable tickets can be blacklisted if stolen.  But blacklisting is not implemented in the MIT KDC, so it's hard to realize this advantage.

On Thu, 2009-03-26 at 17:53 +0100, miguel.sanders at
> I'm having a background process which requires a service principal to 
> work correctly.
> Currently, I'm having a cron job which does a kinit (with the keytab
> supplied) for that service principal.
> Wouldn't it be better to renew the ticket instead of doing the above?
> As a result, I would have to set the renewable lifetime for that 
> service principal to unlimited.

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