But I think most people and tools consider "containers" to be volatile storage, like RAM. Non-volatile storage would be volumes. Honestly I think there is a lo

But I think most people and tools consider "containers" to be volatile storage, like RAM. Non-volatile storage would be volumes. Honestly I think there is a lot to be said for making the writable layer of a container read-only. It makes sure that things like logging, if you care about them, go somewhere safe, or if you don't, get turned off explicitly. And also prevents gotchas like "oops wrote important data to /var/lib/notavolume when I meant to write to /var/lib/therightvolume" that show up at the worst times.