[rhelv6-list] maximum member unix group in /etc/group

[Paul Krizak]

I should also note that nscd (at least under RHEL4, not sure about 5,6) 
has the 1024-char limit too for group entries.  nscd on RHEL4 will 
sporadically return bad data (ex. missing groups) if the group entries 
are > 1024 chars long.


Paul Krizak                         7171 Southwest Pkwy MS B200.3A
MTS Systems Engineer                Austin, TX  78735
Advanced Micro Devices              Desk:  (512) 602-8775
Linux/Unix Systems Engineering      Cell:  (512) 791-0686
Global IT Infrastructure            Fax:   (512) 602-0468

On 12/01/11 11:26, Paul Krizak wrote:
> Yeah this is SOP for NIS-based orgs with large groups. I wouldn't even
> call it a hack at this point, it's been in use so long.
>
>
> Paul Krizak 7171 Southwest Pkwy MS B200.3A
> MTS Systems Engineer Austin, TX 78735
> Advanced Micro Devices Desk: (512) 602-8775
> Linux/Unix Systems Engineering Cell: (512) 791-0686
> Global IT Infrastructure Fax: (512) 602-0468
>
> On 12/01/11 11:17, Iain Morrison wrote:
>> Hi Jason,
>> we had this problem with groups in NIS under RHEL4, and whilst it may
>> be a bug in RHEL 6.1 the workaround we use might work for you.
>>
>> [The length of one entry is limited by the NIS protocol to 1024
>> characters.]
>>
>>
>> -------------------
>>
>> There is another way of solving this problem for /etc/group entries.
>> This idea is from Ken Cameron:
>>
>> 1. Break the entry into more than one line and name each group
>> slightly differently.
>>
>> 2. Keep the GID the same for all.
>>
>> 3. Have the first entry with the right group name and the GID.
>> I don't put any user names in this one.
>>
>> What happens is that going by user name you pick up the GID when the
>> code
>> reads it. Then going the other way it stops after the first match of GID
>> and takes that name. It's ugly but works!
>>
>> ------------------------
>>
>> so for example we have
>>
>> largegroup:x:1234:
>> largegroup1:x:1234:uname01,uname02,...
>> largegroup2:x:1234:uname31,uname31,...
>> largegroup3:x:1234:uname61,uname61,...
>> largegroup4:x:1234:
>> largegroup5:x:1234:
>>
>> thanks
>>
>> iain
>>
>>
>> --
>>
>> Iain Morrison
>> IT Manager
>> MRC Epidemiology Unit
>> Institute of Metabolic Science
>> Box 285
>> Addenbrooke's Hospital
>> Hills Road
>> Cambridge
>> CB2 0QQ
>> Tel 01223 769200
>>
>> -----Original Message-----
>> From: rhelv6-list-bounces at redhat.com
>> [mailto:rhelv6-list-bounces at redhat.com] On Behalf Of Jason Keltz
>> Sent: 01 December 2011 18:08
>> To: Red Hat Enterprise Linux 6 (Santiago) discussion mailing-list
>> Subject: [rhelv6-list] maximum member unix group in /etc/group
>>
>> Under RHEL4, as far as I can see, there was no limitation in unix group
>> size in /etc/group in terms of line lengths or number of users, or at
>> least I never came close to hitting the limit. Under RHEL6.1, I hit the
>>
>> limit today - 126 members. It's not clear if this is a bug or a
>> feature, or why such a limitation would be imposed. It's possible that
>> it was imposed by a patch, but after applying many patches, it's not
>> clear which would have caused it. Any ideas???
>>
>> Jason.
>>
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>
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