Too many open files

If you see this error in Asterisk CLI and it makes Asterisk to crash, solution is following:

Add lines:

*         hard    nofile      65536
*         soft    nofile      65536
root      hard    nofile      65536
root      soft    nofile      65536

to /etc/security/limits.conf

Those changes would be applied after reboot.

To avoid reboot we can apply values by using command:

ulimit -n 65536