-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Pete,
I am aware of a few people that have attempted to use NFS to share the CASCookiePath, with mixed success. NFS seems to have better locking semantics than AFS (which effectively has none). But, I have not heard that anyone has been truly happy using NFS for this. I am quite interested in a memcached solution. I haven't talked to Phil yet, but I would be very interested in a memcached patch -- particularly if the session storage is refactored to be modular and switchable by runtime configuration parameter. - -Matt On 02/17/2011 11:02 AM, Pete Birkinshaw wrote: > Hi, > > Is anyone else using Mod Auth CAS with clustered servers and shared > sessions? I would be grateful for advice on how to share session > state between servers. > > I have colleagues using Mod Auth CAS on four clusters of eight > Linux servers. Each cluster is load-balanced (without sticky > sessions) and uses AFS for shared storage. Until recently CAS > session files were stored on an AFS partition (the CASCookiePath). > However, we've recently had some mysterious problems with Apache > processes and as part of the investigation Mod Auth CAS session > files were moved off the shared AFS storage and are no longer > clustered. > > As you would expect, this is causing a *lot* more traffic to the > CAS server and isn't a good solution. Simply moving back to AFS may > bring scalability issues - I don't think AFS is a good fit due to > frequent writes, lack of locking in AFS, sync overhead, and so on. > We've seen similar situations with PHP session files. Sticky > sessions aren't possible on this service as we're getting thousands > of connections per second. > > My preference is to patch Mod Auth CAS to use Memcached, Redis or > something similar to share state but this might take awhile to > arrange. > > Has anyone already worked around this problem? > > Pete Birkinshaw > > -- Peter Birkinshaw Senior Directory and Registration > Administrator IT Services Division | +44 (0)161 306 3118 > The University of Manchester | PGP: 0xB7B0B433 > > > - -- Matthew J. Smith University of Connecticut UITS matt.sm...@uconn.edu -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk1dWqIACgkQGER0Au6g8xDuNQCbBEF/ocSMiC2G4bKq20bB7u5W bT8An2Adr3PxIBpt4f4LRGyZKphmJh1b =vTyP -----END PGP SIGNATURE----- -- You are currently subscribed to cas-user@lists.jasig.org as: arch...@mail-archive.com To unsubscribe, change settings or access archives, see http://www.ja-sig.org/wiki/display/JSG/cas-user
