Configure user resource limits
Any user can change it’s own soft limits, between “zero”, and the hard limit (typically enforced by pam_limit).
To print all the resource limits for the current user:
ulimit -a
Show the current Soft limit for “memlock”:
ulimit -S -l
> 64
Set the current Soft “memlock” limit to 48KiB:
ulimit -S -l 48
The system resources are defined in a configuration file located at /etc/security/limits.conf. ulimit, when called, will report these values.
To manually set resource limits for users or groups:
sudo vim /etc/security/limits.conf
Each entry has to follow the following structure: [domain] [type] [item] [value].
These are some example lines which might be specified in /etc/security/limits.conf:
* soft core 0
root hard core 100000
* hard rss 10000
@student hard nproc 20
@faculty soft nproc 20
@faculty hard nproc 50
ftp hard nproc 0
@student - maxlogins 4
To find limits for a process:
cat /proc/<PID>/limits