Check ulimit for non shell user


To check the ulimit of a running process if your unable to switch to the user.

Get the pid of the process and run the below.

 cat /proc/PIDHERE/limits
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Issue starting mongodb


If you get the below error when starting mongodb

ERROR: child process failed, exited with error number 100

Try amending the mongod conf in /etc/mongo.conf by adding the below

smallfiles = true