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How do you permanently set process limit per user (ulimit -u) in Ubuntu?

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2 Answers

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Edit /etc/security/limits.conf and configure nprocs appropriately.

You may need to add pam_limits to your pam configuration. The default configuration has pam_limits configured for many services. You may want to add pam_limits to /etc/pam.d/common-session.

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I think you may need to make some changes in /etc/pam.d as well. – belacqua Apr 11 '11 at 18:17
I'm not 100% sure the PAM changes are still required, but they used to be -- was trying to grok some related bug reports, but it'd be easier to test it, I think. – belacqua Apr 11 '11 at 18:30
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@jgbelacqua: They are there for all the common login methods (login, sum sudo, and *dm) methods as well as cron methods for 10.4 and 10.10. – BillThor Apr 11 '11 at 18:34
A better description of this solution here: askubuntu.com/a/162230/119284 – e_x_p Jan 6 at 19:16
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Edit /etc/security/limits.conf, making changes per the examples and for the limits you want.

You'll also need to add a line to the /etc/pam.d/common-session file:

session required pam_limits.so

The change to PAM modules may be necessary elsewhere, but generally, common-session is included related configurations, e.g., 

$ grep common-session /etc/pam.d/sshd :     

   sshd:@include common-session
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Thank you, I'll vote up your answer when I get enought points :) – redman Apr 11 '11 at 18:34

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