I strongly DO NOT recommend using devicemapper as storage in Docker. Every time we have tried, and every customer who has tried, has failed medium to long term,

I strongly DO NOT recommend using devicemapper as storage in Docker. Every time we have tried, and every customer who has tried, has failed medium to long term, in bad ways. It became so painful that we literally blacklist devicemapper as a supported filesystem in the Discourse installer. We waited a year for this to "stabilize" but it never did.