Stateless and Stateful

Stateless Applications

This means application that doesn't have a state and doesn't write any local files.

also cannot keep local session
if same app is ran multiple times, it won't change state
scales horizontally
session management is done outside the container
files that need to be saved cannot be saved locally on the container

Stateful Applications

Includes traditional databases such as PostgreSQL and MySQL which have database files that can't be split over multiple instances.

cannot horizontally scale
can be ran on a single container and scale vertically
use volumes to save data

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