cPanel servers, particularly with jailshell enabled, may produce the error fork: Resource temporarily unavailable
To increase the resources available to a regular user you need to edit three files
/etc/profile
/etc/bashrc
/etc/profile.d/limits.sh
Each will contain code similar to the following...
if [ "$LIMITUSER" != "root" ]; then
ulimit -n 100 -u 10 -m 100000 -d 100000 -s 8192 -c 100000 -v 100000 2>/dev/null
else
ulimit -n 4096 -u 14335 -m unlimited -d unlimited -s 8192 -c 1000000 -v unlimited 2>/dev/null
fi
In the first ulimit command, update it to a higher figure. eg. 35 as in the following
if [ "$LIMITUSER" != "root" ]; then
ulimit -n 100 -u 35 -m 100000 -d 100000 -s 8192 -c 100000 -v 100000 2>/dev/null
else
ulimit -n 4096 -u 14335 -m unlimited -d unlimited -s 8192 -c 1000000 -v unlimited 2>/dev/null
fi
Now log in as a regular user, not root, and the error should be gone. If it hasn't, as root you can check how many processes a user is using and adjust the limit accordingly.
ps aux | grep USERNAME | grep -v grep | wc -l
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