Today I had to manually rotate a couple of logs since they had generated a filesize of over 1.8GB of pure text.
This was done by issuing the command
In my case I had to rotate my firewall log /var/log/firewall described in a custom made file, /etc/logrotate.d/firewall
logrotate -v -f /etc/logrotate.d/firewall
-v Verbose logging
-f Force rotation of logs even if not needed