Restarting Our Rails Server with Database
Explore how to integrate a Postgres database into your Rails app using Docker Compose. Learn to organize environment configurations, create development and test databases with Rails commands, and restart the Rails server to apply changes. This lesson helps you verify the database connection and practice running migrations and scaffolds in a Dockerized Rails environment.
Separating our environment-specific configurations
First, we will need some directories to store our environment-specific config:
$ mkdir -p .env/development
Configurations of web
Then we require a file, .env/development/web (without a file extension), which contains our web-service-specific environment variables:
DATABASE_HOST=database
Configurations of database
And another file, .env/development/database, containing variables for our database service:
POSTGRES_USER=postgres
POSTGRES_PASSWORD=some-long-secure-password
POSTGRES_DB=myapp_development
Updating the Compose file
Now we need to tell Compose to use these files instead of explicitly setting
the variables directly. We do this using the env_file directive:
We could have named the environment files anything we liked, but we chose a simple naming scheme that made sense. Similarly, you are free to use whatever file structure and naming conventions you like for the ...