containerization-and-devops

Theory - Containerization and DevOps

This folder contains class-wise theory notes for the subject
Containerization and DevOps.

The notes include both conceptual understanding and command-level explanations wherever required.

Class-wise Notes

Class 1 - Docker Basics (Hands-on)

Topics covered:

Docker introduction
Docker architecture overview
Basic Docker commands
Image and container lifecycle

Open Class 1 Notes

Class 2 - Application Containerization (Java & Python)

Topics covered:

Writing Dockerfiles for different languages
Building Docker images using custom Dockerfiles
Running containers interactively
Installing dependencies inside images
Using alternate Dockerfiles
Tagging and pushing images to Docker Hub
Inspecting image layers using docker history
Volume mounting for dynamic execution

Open Class 2 Notes

Class 3 - Docker Engine API via Unix Socket (Hands-on)

Topics covered:

Docker daemon and REST API
Understanding /var/run/docker.sock
Accessing Docker Engine using curl
Pulling images via API
Creating containers using HTTP requests
Starting and stopping containers via API
Inspecting container metadata

Open Class 3 Notes

Class 4 - Multistage Docker Build (Hands-on)

Topics covered:

Single-stage Docker build using Ubuntu and GCC
Building a C application inside a Docker container
Understanding Docker image layers
Introduction to Multistage builds
Using AS builder stage
Using FROM scratch for minimal images
Copying artifacts using COPY --from=builder
Comparing image sizes (Single vs Multistage)
Optimizing images for production environments

Open Class 4 Notes

Class 5 - Docker Volumes and Bind Mounts (Hands-on)

Topics covered:

Introduction to Docker data persistence
Creating and listing Docker volumes
Mounting named volumes inside containers
Data persistence after container removal
Bind mounts using host directories
Comparing bind mounts vs named volumes

Open Class 5 Notes

Class 6 - Docker Networking (Hands-on)

Topics covered:

Default Docker networks (bridge, host, none)
Inspecting bridge network configuration
Creating custom bridge network
Running containers in custom networks
Container-to-container communication using ping
Host network mode
Checking open ports using ss

Open Class 6 Notes

Class 7 - Docker Advanced Commands (Hands-on)

Topics covered:

Initializing Docker Swarm on multi-interface hosts
Using --advertise-addr to resolve swarm IP selection issues
Creating and testing attachable overlay networks
Running and verifying inter-container communication
Inspecting host routing configuration
Creating and using macvlan networks with static container IPs

Open Class 7 Notes

Class 8 - Docker Compose (Hands-on)

Topics covered:

Writing and using docker-compose.yml for multi-container applications
Defining services, networks, volumes, and environment variables
Running Compose stacks in detached mode
Verifying container health and service startup
Deploying and accessing a WordPress + MySQL setup
Persisting database and application data with named volumes
Open Class 8 Part 1 Notes
Open Class 8 Part 2 Notes

Class 9 - Docker Compose and Reverse Proxy (Hands-on)

Topics covered:

Scaling services with docker compose up -d --scale
Handling port conflicts during horizontal scaling
Comparing internal-only scaling vs port-range exposure
Understanding ports vs expose in Compose
Configuring Nginx as a reverse proxy for scaled WordPress replicas
Implementing load-balanced, production-style multi-tier architecture
Open Class 9 Part 1 Notes
Open Class 9 Part 2 Notes

Class 10 - Docker GUI Management with Portainer (Hands-on)

Topics covered:

Creating volumes for persistent data
Installing Portainer using Docker CLI
Mapping ports and mounting the Docker socket
Accessing Portainer Web UI
Setting up the initial administrator account
Navigating the local Docker environment dashboard

Open Class 10 Notes

Class 11 - Introduction to Kubernetes & Local Setup (Hands-on)

Topics covered:

Why Kubernetes is needed for container orchestration
Core Kubernetes architecture (Control Plane, Worker Nodes)
Comparing local Kubernetes tools (Minikube, k3s, k3d, kind)
Installing kubectl and k3d on WSL
Creating a local cluster with k3d
Running Pods, Deployments, and Services
Scaling and exposing applications
Understanding kubeconfig structure and contexts

Open Class 11 Notes