Increase maximum limit of open files per user

If you want to increase the limit of open files for the current session, simply run

ulimit -n 2048

If you want to increase it by default, edit /etc/security/limits.conf and add

*    hard     nofile     2048
*    soft     nofile     2048

or if you want to increase it only for a certain user, set it as

userlogin    hard     nofile     2048
userlogin    soft     nofile     2048