Is it possible to have multiple instances of the same app running in Docker containers and having readonly access to a "global" memory linked file? What I'm trying to achieve is having sand-boxed consumers having access to some shared resource.
Yes, it's idiomatic, but typically you will use shared filesystem access rather than shared memory. By default nothing is shared, and you can specify exceptions using shared directories called "volumes": http://docs.docker.io/en/master/use/working_with_volumes/
