Aaditya Desai

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📌 DevOps Learning Series – Part 4: Docker 🐳

After CI/CD, the next big challenge is environment consistency.

It works on my machine” should never reach production — and Docker solves exactly that.

Docker allows us to package applications with everything they need and run them anywhere.

1️⃣ Containers vs Virtual Machines

Containers are lightweight and fast

Share the host OS kernel

Perfect for microservices and CI/CD pipelines

2️⃣ Core Docker Concepts

Images: Blueprint of your application

Containers: Running instance of an image

Dockerfile: Instructions to build images

Registry: Store and share images (Docker Hub)

3️⃣ Essential Docker Commands

docker build

docker run

docker ps

docker exec

docker pull / docker push

4️⃣ Writing Dockerfiles

Base images

Copying code

Exposing ports

Running applications

5️⃣ Docker in Real DevOps Workflows

Used inside Jenkins pipelines

Ensures consistency across environments

Makes deployments faster and reliable

💡 Why Docker matters in DevOps?

Because containers make applications portable, predictable, and scalable — a core DevOps requirement.

Sharing this as a DevOps intern, learning by building and documenting the journey for others.

📍 Next up: Kubernetes (Container Orchestration) ☸️

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#DevOps #Docker #Containers #DevOpsJourney #InternLife #LearningInPublic #CICD #Cloud

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