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On Fri, Aug 03, 2007 at 03:06:15PM +0100, Brew, CAJ (Chris) wrote: > Hi All, > > Does anyone know the maximum permissible UID in Linux of the top of > their head? > > I'm thinking of redoing my pool accounts to make them a bit more > sensible with some sort of systematic numbering scheme with plenty of > space for whatever crazy ideas the developers come up with next. > > Since there is (theoretically at least) sitewide allocation of UID/GID > blocks here at RAL I'd like to get well out of the way of that. So how > high can I go? The kernel uses 32bit uids since the 2.4 days and I think glibc got the support before 2.2 The only problem that I've seen so far is with the accounting which is still stuck at 16bit :( This means that for example lastcomm gives you either wrapped uids or nobody for uids about the 64k limit depending on which version of EL you are running. I am pretty sure that there is a ticket open for it in bugzilla, from what I remember it requires changes to the accounting format that the kernel writes and the tools to parse it so I would not expect a fix for it in existing rhel versions. Cheers, Kostas