On 12/15/2016 12:18 PM, Josh Berkus wrote: > Dan, Dusty, Vivek: > > So far nobody has defined (technically) the exact problem with overlayfs > and how it affects applications which want to write data inside the > container. > > Note that just saying "don't use Overlay for persistent data" really > isn't good enough. Apps in containers frequently write data to places > users aren't aware of, such as writing port information to /var/run. > While this data may not be important to the user, the app will fail if > it errors out. > > Pushing a change which will cause 30% of a user's containers to start > failing for reasons which are opaque to them is not something we should > do lightly. > Josh. More likely this will cause .0001% of users to fail. But it is not a Posix compliant database, so their could be issues.
Only other issues I know of now are the handling of "special" files things like sock_files, character devices etc. But these should almost always be on tmpfs places like /dev and /run.
