How can I raise the open file limit for the login failure daemon?

The login failure daemon can crash if you are monitoring a lot of domains in Plesk and are reaching the open file limit for your server. To raise the limit:

Edit the login failure daemon systemd service:

systemctl edit lfd.service

Add the following to the override.conf file:

[Service]
LimitNOFILE=65536

Reload  systemd:

systemctl daemon-reload

Restart the LFD service:

systemctl restart lfd.service
  • LimitNOFILE, lfd
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