Kwa chaguo-msingi, data ndani ya container ni ya muda — inapotea wakati container inapoondolewa. Volumes (na bind mounts) hutoa uhifadhi wa kudumu unaoendelea baada ya containers, muhimu kwa databases na data yoyote inayopaswa kustahimili kuanzishwa upya/kuondolewa kwa containers.
Tatizo: containers ni za muda
A container's writable layer is DELETED when the container is removed:
→ data written inside the container (e.g. a database's files) is LOST
→ containers are meant to be disposable/replaceable → don't store important data in them
→ For persistent data, you need storage OUTSIDE the container's lifecycle.
