Cannot link to a non running container: /db AS /worker-app/db

Docker
#1

Hello guys. Good day!

I’m stuck with this problem and I can’t quite figure out why:

Material

Course: Docker for the Absolute Beginner
Chapter: Docker Comepose - Demo - Example Voting application
Video link here: Docker Training Course for the Absolute Beginner | KodeKloud
Time stamp: 12: 40

Problem:

In the demo video, the docker run order is:

  1. run redis
  2. run voting-app
  3. run postgres
  4. run worker-app
    …

In the demo video, when Mumshad runs step 3, the postgres is up and running so the worker gets linked no problem in the 4th step. But when I run step 3 postgres, it exits immediately and I can’t link the worker in the next step.

I am aware that you can’t run a container without any process running in it. I followed exactly what Mumshad did. Not a single word changed in my attempt. What’s the magic that I’m missing here? How can you keep postgres alive?

I’d appreciate anybody’s input,
Thank you!

#2

Run Postgres with the below command:

docker run --name=db -e POSTGRES_HOST_AUTH_METHOD=trust postgres:9.4

#3

Hey Ayman!

This solved my trouble, thank you so much!
One more question though: as I understand, POSTGRES_HOST_AUTH_METHOD=trust is rather for testing purposes cause this is not secure. What would be the right approach to get a postgres db up and running if we were to access it by actually giving preset ID and password…?