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docs: add Docker prune troubleshooting guidance #1441

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19 changes: 19 additions & 0 deletions docs/troubleshooting.rst
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Expand Up @@ -105,6 +105,25 @@ Finally, if no container or other programs are making use of port 3306, check th
Check whether the MySQL container is crashing upon startup, and if so, what is causing it to crash.


Docker is using too much disk space
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Docker does not automatically remove unused objects, so images and build cache can consume a large amount of disk space over time. Check Docker's disk usage with::

docker system df

Before pruning, start the Tutor platform whose images you want to keep. For example::

tutor local start

Then remove unused Docker objects with::

docker system prune -a

.. warning::
This command removes all stopped containers, unused networks and images, and unused build cache. Review Docker's confirmation prompt before proceeding. Do not add the ``--volumes`` option unless you intend to remove unused volumes, which may contain persistent data.


Help! The Docker containers are eating all my RAM/CPU/CHEESE
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