su ulimit configuration issue on SLES servers

At our company we use SLES as the favored Linux distribution. 

Sudo and su are used to make things on the servers work
a little bit more secure.

We had problems on some dated versions of SuSe with running
the su command in combination with ulimit settings.

Limits were set in the file /etc/security/limits.conf for a particular
user but after a su switch to that user the limits set weren’t

Problem was that the pam_limit module wasn’t loaded in the /etc/pam.d/su
configuration file. Just added the rule

session required

to the file after that limits were handled correctly when using the su command.

In later versions of SLES the whole PAM configuration is set-up
a little bit different. There are common config files which are
included by the different sub parts.

session include common-session

session required

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