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I have normal user and i want to block all commands to the user except set of commands are { cd , exit , ls } can any one please help me over here


Just restarting postgres is not a long term solution, you will hit the limit again, unless you have physical resource constraints on the server such as memory. During the issue the number of processes opened(nproc) by postgres user was 503 and the estimated number of open files(nofile) was 35225 and yet your postgres_limits.conf shows that you have set nproc ...


I've got satisfied with the following approach to disable su (tested in Lubuntu 14.10). Open file /etc/pam.d/su. Then uncomment line: # auth required pam_wheel.so After this nobody (except users which are in 'root' group) can use su. But it is still possible to start root session using sudo su.

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