SD cards don't love alot of writes, so to reduce it some I turned off ghosts very promiscuous logging of all traffic to just report on errors only.
I added "level": "error", to the config file at the root of the the Ghost install at /var/www/ghost so the logging entry looks like:
"logging": {
"level": "error",
"transports": [
"file",
"stdout"
]I also want to stop the logging of Ubuntu, which logs through the rsyslog daemon. I can stop it with this command: sudo systemctl stop rsyslog.service however on restart it will start back up again. To stop logging permentatly you need to use the following command: sudo systemctl disable rsyslog.service you can of course trade the disable for enable and start it back up if you need to debug again.
A SD card isn't the most reliable media in general even with logging turned off, so I backup my Ghost install nightly using the excellent Python tool and documentation by Ganapathy.
Ghost provides alot of other options as well with great documentation here:
Ghost