Docker Mastery

Build Apps That Deploy Anywhere

Section 1 – Introduction

L1 Introduction

Section 2 – Required Downloads and Installations

L1 Required Downloads and Installations

Section 3 – The Need for Docker

L1 The Need for Docker

Section 4 – Running Applications Inside Docker Containers

L1 Important Tip for Windows Users

L2 Running Applications Inside Docker Containers

L3 Struggling with the Docker Run Command?

L4 Workbook - Containerizing Python, Go, and Ruby Applications

Section 5 – Building Images from Dockerfiles

L1 Building Images from Dockerfiles

L2 Workbook - Building Images for Python, Go, and Ruby Applications

Section 6 – Containerizing a Web Application

L1 Containerizing a Web Application (Flask)

L2 Containerizing a Web Application (Spring Boot)

Section 7 – Docker Networks and Microservices

L1 Running Web Applications on the Same Network

L2 Ecommerce Microservices - React, Node, Flask, Spring Boot, Go

Section 8 – Pushing Images to Docker Hub and Tagging Practices

L1 Pushing Images to Docker Hub and Tagging

Section 9 – Streamlining with Docker Compose

L1 Streamlining with Docker Compose

L2 Ecommerce Workbook - Docker Compose

Section 10 – Running Databases inside Docker Containers

L1 Running Databases inside Docker Containers

L2 Ecommerce Workbook - Docker Compose and Database Volumes

Section 11 – Deploying Containers to the Cloud!

L1 Deploying Two Web Containers and a Database

L2 Setting The Stage

L3 Verify Your Connection URL

L4 Testing the Containers Before Deployment

L5 Update for Container Deployment (Important)

L6 Action Required - Create a Heroku Account

L7 Action Required - Install Git

L8 Action Required - Set up the Heroku CLI (Mac)

L9 Action Required - Set up the Heroku CLI (Windows)

L10 Deploy Your Containers to the Cloud!

Section 12 – Next Course

L1 Next Step - Kubernetes Training

Workbook: Containerizing Python, Go, and Ruby Applications

Key Takeaways

Language-Agnostic Process: Containerization works identically across all programming languages (Ruby, Python, Go, Java, C++) - only the base image changes
Environment Isolation Advantage: Run applications without installing their runtime environments on your host machine - everything happens inside Docker containers
Image Selection Strategy: Each language requires its corresponding official image from DockerHub (ruby:3.0.0, python:3.8-slim, golang:1.16)
Complete System Cleanliness: Removing Docker images leaves no trace of language-specific activity on your system - perfect isolation
Command Line Arguments vs Environment Variables:
- Command line arguments: Any values passed directly to the application when executing
- Environment variables: Specific key-value pairs that applications expect from their runtime environment (use -e flag)
Working Directory Consistency: Applications must reference their container paths (e.g., /app/script.py) rather than host machine paths when executing commands
Universal Docker Workflow: Mount source code → Pull appropriate language image → Execute language-specific commands → Clean up automatically with --rm
Runtime Flexibility: Applications can accept both command line arguments and environment variables within the same container execution