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Offline prune Geth / Online prune Nethermind.

The Geth DB will grow over time, and may fill a 1TB SSD in about 6 months.

You can offline prune Geth, bringing it back down close to its initial DB size.

Semi-automated Geth or Nethermind prune

Run ./ethd prune-geth if using Geth. It will check prerequisites, offline prune Geth, and restart it.

Run ./ethd prune-nethermind if using Nethermind. It will check prerequisites, online prune Nethermind, and restart it.

Fully automated Geth or Nethermind prune

The script ./ can be run in crontab to monitor disk space, and start a Geth or Nethermind prune when free disk space is below 100/250 GiB or below 10%, whichever comes first.

The script requires the bc package, install that first: sudo apt install bc

The script needs to be able to execute docker commands. If your user is a member of the docker group - that is, you can run docker ps without needing sudo - then you can crontab -e to add a crontab entry. If you require sudo for docker commands, place the script in root's crontab instead via sudo crontab -e.

An entry such as the following would run the script every day at 8AM local. Adjust the path to point to where your instance of eth-docker has been installed.
00 8 * * * /home/USER/eth-docker/

The MAILTO line will attempt to send you email when the script starts a prune. You'll need something like msmtp for those mails to reach you.

The script can be run as --dry-run if you just want the email alert and not the automatic prune itself. --dry-run works without eth-docker installed, as well.