The exact reason it blows up isn't even necessarily all that important, other than in its effect on what you should be doing to reduce the probability of downtime. Well-engineered systems are routinely developed from less than completely reliable parts. Stuff fails, we design for it.
It's certainly not reason not to use it, if it's resulting in a net positive gain in your ability to get things done and maintain control and transparency over your deployed systems.
But it's certainly a good reason (among a long list of good reasons) to make sure you have a good backup routine in place, including regular testing of both their integrity and your ability to restore a working prod system from them quickly.
Distributed scalable automation will accidentally your data slightly more often. The more stuff you have the more edge cases and bugs you have.
Scale big fail big as I like to say.
docker volume prune says:
"Remove all unused local volumes. Unused local volumes are those which are not referenced by any containers"
If it removed a local volume that was being used by a container that is kinda bad.
2. Why are you running docker on ad-hoc machines you need to prune?
3. Why do you even need root access on production machines to fiddle around with docker commands?
While this is obviously a bad bug (and there are many with Docker), it seems more of an operational procedures failure than anything else. You could be saying:
“Beware of rm -rf /, it just deleted 20gb of production data”
Ok. Sure. But why are you tools and procedures putting yourself in a position to make that mistake?
We don't know his environment. We don't know his company's policies. We don't know his hardware, connectivity, or budget issues. These kinds of passive aggressive responses are almost never helpful.
That’s not a surprise, and maybe the issue at the core here is not really Docker. That’s all.
They may have valid reasons to do that, even if not common.
export $WORKDIR=Home/me/proj
...
rm -rf /$WORKDIR
So then Docker is designed to treat all of those as disposable.
I just searched "recette" and only came up with French cooking references.
It’s surprisingly easy with docker, especially when dealing with .... legacy systems.
The joys of open source users..
Flip side . . .
Computers are terrible. They can screw things up so bad it would require a thousand people to accomplish in the same amount of time.