On Wed, Jul 20, 2011 at 08:56:47AM -0400, Benjamin Coddington wrote: > On Jul 13, 2011, at 1:35 PM, J. Bruce Fields wrote: > > On Wed, Jul 13, 2011 at 12:03:03PM -0400, Benjamin Coddington wrote: > >> I am working on a linux NFS cluster that requires a single svcgssd to establish contexts under multiple service names. > >> > >> In this scenario, svcgssd can be called with "-n" so that it acquires creds at context creation. After running this way I found svcgssd opens a file to the kerberos replay cache for every context/cred, eventually reaching ulimit. For a busy cluster with many different client-user pairs that becomes a problem. I am lost in the gss_krb5 code, but suspect that the kerberos code leaks credentials in this configuration. > >> > >> Ondrej Palkovsky submitted a patch to specify multiple identities and acquire creds up-front using multiples of "-h": http://marc.info/?l=linux-nfsv4&m=123685185324902&w=2 > >> > >> I've updated that work to be current to nfs-utils-1.2.3 which solves our immediate problem, and it works well -- but running svcgssd with '-n' is still going to leak file handles to the replay cache. What's the best way to fix this? Can the created-on-the-fly cred can be re-used for subsequent contexts? > > > > Sounds like a likely kerberos bug as well--may be use asking the > > kerberos folks? > > > > --b. > > It is a kerberos bug where the context is not cleaned up in gss_export_lucid_sec_context(), so svcgssd leaks a bit. Here's a reference to the kerberos problem: http://marc.info/?t=131068390400045&r=1&w=2 Good, thanks for following up. --b. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
