Docker for Rails Developers

Starting a Postgres Server

We want to run a Postgres server for our Rails app to use. The process is very similar to how we added Redis.

In the previous chapter, we started by familiarizing ourselves with how to run the Redis server with docker run. However, now that we’ve had some experience with adding a service, let’s take the safety wheels off and jump straight to setting up Postgres directly with Compose.

Let’s add Postgres to our docker-compose.yml file:

version: '3'

services:

  web:
    build: .
    ports:
      - "3000:3000"
    volumes:
      - .:/usr/src/app

  redis:
    image: redis

  database:
    image: postgres
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: some-long-secure-password
      POSTGRES_DB: myapp_development ...