TheImmatureAdmin
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TheImmatureAdmin's post in Docker Image File Getting Full - Where has the space gone? was marked as the answerFor anyone curious, I found this old thread and the 'docker volume prune' command worked for me. I anticipate the size to keep growing until I find root cause, but for now it worked.
https://forums.unraid.net/topic/103674-solved-kinda-high-docker-utilization-but-container-size-doesnt-match/
For more context, I ran 'docker system df' with these results:
89 local volumes seemed like a high number with only 3 in active use. I decided to go ahead and try the 'docker volume prune' command even though only ~1.8GB seemed to be reclaimable. The result showed "total reclaimed space: 1.449GB", but checking the dashboard in Unraid now shows only 23.1 GiB usage when I was sitting at 44+ GiB before executing the prune command. That command got me back over 20GB.
There still is the mystery of how that space is getting filled up, but at least I can clear it out now manually as needed.