Docker Before Compose - Learn Docker by Example

Build a local Rails app and a custom Docker image from a Ruby 2.5 base, install bundler and node runtime, copy files, and expose port 3000.

Learn the core Docker concepts through hands-on building of images and running containers, covering Docker Hub registries, Dockerfile basics, networking, and volumes to persist Postgres data.

Install Docker on your local machine by following the official documentation for Mac or Windows setup, then proceed to the next part of the course.

Generate a Rails app, craft a Dockerfile, and build and run a custom Rails image with Docker, troubleshoot Ruby 2.5.7 vs 2.5 Gemfile, and prepare a Postgres database.

Explain how to build a bare-bones Rails image from a Ruby base, update packages, install a no-js runtime, install bundler and gems, copy app files, and expose the port.

Learn how to run a Postgres container from the official image on Docker Hub, configure default credentials, connect a Rails app, and understand container networking without Docker Compose.

Create and use a docker network named my network for the database and application, connect containers to it, and prepare the Rails app database.

Learn how to run rails migrations inside a docker container using docker exec, manage container IDs, generate migrations, fix ruby version mismatches, and rebuild images to apply pending migrations.

This course provides hands-on practice with Docker by example, building and pulling images, configuring networks, running and troubleshooting containers, and mastering Docker Compose as the primary workflow.