Docker - Rails app cannot connect to linked Postgres container (doesn't seem to be running)

Question

I\'ve been following this guide of how to set up a Rails Development Environment using Docker: Setting Up A Rails Development Environment Using Docker.

I\'ve hit a f

Answer 1

You try to connect to localhost:5432 in other words you try to connect to the web container, but your point is db. Just specify Database host in your application like db