how to set ulimits for a specific user with no login shell

polemon · 09-26-2007, 03:48 PM

Hi!

I have an application, that need additional filedescriptors.

Code:

# ulimit -a
core file size        (blocks, -c) 0
data seg size         (kbytes, -d) unlimited
file size             (blocks, -f) unlimited
max locked memory     (kbytes, -l) unlimited
max memory size       (kbytes, -m) unlimited
open files                    (-n) 1024
pipe size          (512 bytes, -p) 8
stack size            (kbytes, -s) 8192
cpu time             (seconds, -t) unlimited
max user processes            (-u) unlimited
virtual memory        (kbytes, -v) unlimited

As you can see, I have a limit of 1024 descriptors (this is also the hard limit, mind you).

Now, I'd like to increase this value, say, double it.

I can do this with the 'ulimit -n 2048' command, for the current user.

Setting the limit this way, is not global and not permanent.
Changing the setting in /etc/security/limits.conf is not option either, since the user for what I need to change the limit, is a system user with no login shell (/bin/false).

The application is being started from an init script with the start-stop-daemon tool, it changes to the specified user once it's invoked.

How can I change that limit to my needs, when the user under which my application is run, has no login shell?

please help!

--polemon

polemon · 10-11-2007, 03:54 AM

I solved it:

When ran from an init script. the 'ulimits -n 2048' command has to be set right before the command that should get those limits.

Even if this is a setuid program, the user as which the command is executed, will hate those ulimits.