Linux stores log files in /var/log/. These logs take large amount of disk space in several gigabytes after a few months. Most of the time, we don't need these data. Here we go to clean them. To prevent it to become that big in the future it's a pretty good idea to use logrotate.
DH parameters define how OpenSSL performs the Diffie-Hellman (DH) key-exchange.
Using a cron tab in Plesk to increase server security is made fast in only three minutes.
Valid for almost all Linux distributions even without Plesk administration.