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# vi /etc/security/limits.conf
@student hard nproc 50
vivek hard nproc 300
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Understanding /etc/security/limits.conf file
Each line describes a limit for a user in the form:
<domain> <type> <item> <value>
Where:
- <domain> can be:
- an user name
- a group name, with @group syntax
- the wildcard *, for default entry
- the wildcard %, can be also used with %group syntax, for maxlogin limit
- <type> can have the two values:
- "soft" for enforcing the soft limits
- "hard" for enforcing hard limits
- <item> can be one of the following:
- core - limits the core file size (KB)
- <value> can be one of the following:
- core - limits the core file size (KB)
- data - max data size (KB)
- fsize - maximum filesize (KB)
- memlock - max locked-in-memory address space (KB)
- nofile - max number of open files
- rss - max resident set size (KB)
- stack - max stack size (KB)
- cpu - max CPU time (MIN)
- nproc - max number of processes
- as - address space limit
- maxlogins - max number of logins for this user
- maxsyslogins - max number of logins on the system
- priority - the priority to run user process with
- locks - max number of file locks the user can hold
- sigpending - max number of pending signals
- msgqueue - max memory used by POSIX message queues (bytes)
- nice - max nice priority allowed to raise to
- rtprio - max realtime priority
- chroot - change root to directory (Debian-specific)
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