DevOps-Containerization

Docker Networking & Multi-Container Basics (Windows Environment)

Overview

This practical session demonstrates Docker networking concepts including bridge networking, container-to-container communication, port mapping, and multi-container deployment using Docker Desktop on Windows.

Tools & Technologies Used

Windows 11
Docker Desktop
Ubuntu Docker Image
Nginx Docker Image
Redis Docker Image
Command Prompt (CMD)
Git & GitHub

Step 1: List Existing Docker Networks

docker network ls

Step 2: Create Custom Bridge Network

docker network create my-network
docker network ls

Step 3: Run First Ubuntu Container

docker run -dit --name container1 --network my-network ubuntu
docker ps

Step 4: Run Second Ubuntu Container

docker run -dit --name container2 --network my-network ubuntu
docker ps

Step 5: Container-to-Container Communication

docker exec -it container1 bash
apt update
apt install -y iputils-ping
ping container2
exit

Step 6: Port Mapping with Nginx

docker run -d --name webserver -p 8080:80 nginx
docker ps

Access in browser: http://localhost:8080

Step 7: Multi-Container Deployment (Redis Service)

docker run -d --name redis-server redis
docker ps

GitHub Version Control Commands

cd DevOps-Lab-Assignments
mkdir "Class Practical 23 Jan"
cd "Class Practical 23 Jan"
notepad README.md

cd ..
git add .
git commit -m "Added Class Practical 23 Jan - Docker Networking"
git push

Result

Custom Docker bridge network created successfully.
Containers communicated using internal Docker DNS.
Nginx service exposed to host using port mapping.
Multiple containers deployed simultaneously.
Project successfully pushed to GitHub.

Conclusion

This experiment demonstrates Docker networking fundamentals including bridge mode networking, service exposure, and multi-container architecture. These concepts form the foundation of microservices-based application deployment and modern DevOps practices.

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