I was messing with docker a few weeks ago and noticed a drive has 10gb used from docker.img. I couldn't figure out how to delete it so I logged in via SSH and went to the disk then "rm docker.img"

 

it's gone now but the used space remains. Was it safe to do that? I'm starting to second guess myself.

Settings docker. Disable the service. Advanced view. Delete the image file.

You probably didn't disable the service so it just recreates itself.

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that's what it was, thanks!

5 hours ago, Squid said:

Settings docker. Disable the service. Advanced view. Delete the image file.

You probably didn't disable the service so it just recreates itself.

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if this like a fail safe in case you get rm happy?

No.  If the service is enabled docker.img has to exist.  If it doesn't (ie: brand new install, etc) then it creates it.  In your case it probably happened after it rebooted.