ulimit.md

Increasing max open file descriptors on a Droplet w/Ubuntu

Add session required pam_limits.so to these two files:

/etc/pam.d/common-session
/etc/pam.d/common-session-noninteractive

Next, edit /etc/security/limits.conf

... and add the following lines:

* soft nofile 20000
* hard nofile 30000
root hard nofile 16384
root soft nofile 16384

The last two lines can be skipped if you're not running the node as root.

Log out and back in or reboot and see if ulimit -n picked it up

On some systems, you may need to change systemd files, etc.

Docker

Once the host is updated, pass --ulimit nofile=16384:16384