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How to set or change the default soft or hard limit for the number of user's processes?

Solution Verified - Updated 2017-12-26T21:36:39+00:00 -

Issue

The system wide configuration file /etc/security/limits.d/90-nproc.conf (RHEL5, RHEL6), /etc/security/limits.d/20-nproc.conf (RHEL7) specifies the default nproc limits as:
```
*            soft    nproc     1024
root       soft    nproc     unlimited
```
However, when logged in as root, the ulimit shows a different value:
```
$ ulimit -u
1024
```
Why it is not unlimited in this case?
How to set or change the default soft or hard limit for the number of user's processes?

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7

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