DOWNLOADING CONCEPT: 1. THE EPHEMERAL NATURE OF CONTAINERS...
↳By default, a container's filesystem is completely ephemeral.
↳If your Postgres Pod writes 50GB of data to /var/lib/postgresql/data, and the Pod crashes, that 50GB is instantly and permanently deleted when the new Pod starts.
↳To run stateful applications (Databases, Message Queues) in Kubernetes, we must decouple the storage lifecycle from the Pod lifecycle.
↳The data must outlive the Pod.
▲ LIVE INCIDENTA Postgres pod was rescheduled to a new node, but has been stuck in Pending for 15 minutes.