Om Sharma

Cloud & DevOps Engineer@Coforge | (AWS/Azure) | Docker, Kubernetes, Terraform, Ansible |Jenkins| CI/CD | MERN Stack

[Om Sharma @OpSharma167]

☸️ What is Kubernetes?

Kubernetes is a container orchestration platform that automates:

🚀 Deployment
📈 Scaling
🔄 Self-healing
🌐 Networking

Why do we need it?

Many containers → Hard to manage manually → Kubernetes automates it.
#Kubernetes #DevOps #Docker #CloudComputing

[Om Sharma @OpSharma167]

How do you use Docker in CI/CD?
Docker + Jenkins?
Docker + AWS ECR?
#DevOps #Docker #AWS

[Om Sharma @OpSharma167]

Docker vs Kubernetes + CI/CD 🚀
#DevOps #Cloud #Docker #kubernetes

[Om Sharma @OpSharma167]

Docker Internals — Quick Guide

What are cgroups?
What is containerd?
What is runc?
What is BuildKit?
What is Docker-in-Docker?
#docker #devops

[Om Sharma @OpSharma167]

What is docker exec?
What is docker inspect?
What is docker stats?
What are Docker volumes?
What happens when a container is deleted?
What are namespaces?
@devopsdotcom #docker #interview #cloude

[Om Sharma @OpSharma167]

🐳 Docker Interview tips

1 How do you secure a Docker container?

2 How do you troubleshoot a stopped container?

3 How do you check container logs?

4 How do you enter a running container?,

#Docker #DevOps #DockerInterview #Containers

[Om Sharma @OpSharma167]

🐳 Advanced Docker Concepts

🔹 Multi-stage Build → Smaller production images
🔹 Docker Security → Scan images & run as non-root
🔹 Docker Registry → Store and distribute images
🔹 Docker Hub → Public/private Docker image registry

Build → Secure → Push → Pull → Run 🚀

[Om Sharma @OpSharma167]

🐳
🔹 Environment Variables → Pass configuration at runtime
🔹 Docker Compose → Run multiple containers together
🔹 Image Optimization → Make images smaller & faster

Examples:

"docker run -e NODE_ENV=production app"

"docker compose up -d"

#Docker #DevOps #DockerCompose

[Om Sharma @OpSharma167]

🌐 Docker Concept #6: Ports

A container has its own network, so we map a host port → container port.

docker run -p 8080:80 nginx

localhost:8080 → Container:80

💡 "-p" / "--publish" makes the container accessible from outside.

#Docker #DevOps #Containers #Networking

[Om Sharma @OpSharma167]

Pls never link your credit card to your UPI account

[Om Sharma @OpSharma167]

🐳 Dockerfile, CMD & ENTRYPOINT

📄 Dockerfile → Instructions to build an image
▶️ CMD → Default command
🔒 ENTRYPOINT → Main command when container starts

Flow:

Dockerfile → Image → Container

Ex

ENTRYPOINT ["node", "app.js"]
CMD ["--port", "3000"]

#Docker #DevOps

[Om Sharma @OpSharma167]

🐳 What is a Docker Image?

A Docker Image is a read-only template containing everything needed to run an application.

📦 Code + Dependencies + Runtime + Configuration

Dockerfile → Image → Container
🔹 Stored in Docker Hub/ECR

#Docker #DockerImage #DevOps #Containers

[Om Sharma @OpSharma167]

📦 What is a Container?

A container is a lightweight, isolated environment that packages:

So it can run consistently across:

💻 Laptop → 🖥️ Server → ☁️ Cloud

🔹 Portable
🔹 Fast
🔹 Isolated
🔹 Reproducible

Build once → Run anywhere 🚀

#Docker #Containers #DevOps #Cloud

[Om Sharma @OpSharma167]

@deployxa Yeah, also I use alpine in my personal project

[Om Sharma @OpSharma167]

🐳 What is Docker?

Docker packages your application + dependencies into a container 📦 so it can run consistently anywhere.

Code → Image → Container → Deploy 🚀

🔹 Lightweight
🔹 Fast
🔹 DevOps & CI/CD friendly

Build once. Run anywhere.

#Docker #DevOps #Containers #CI/CD

[Om Sharma @OpSharma167]

🐳 Docker vs VM

Docker 📦
→ Lightweight
→ Shares host OS kernel
→ Starts in seconds
→ Great for DevOps & CI/CD

VM 🖥️
→ Full guest OS
→ More resource usage
→ Slower startup
→ Strong OS-level isolation

#Docker #DevOps #VirtualMachine #Containers

[Om Sharma @OpSharma167]

@deployxa Yeah, docker multi-stage builds and layer caching is a magic concept in Docker

[Om Sharma @OpSharma167]

@icelimit3d Thanks for sharing 😊

[Om Sharma @OpSharma167]

Both run containers on AWS, but they work differently.

ECS → AWS-native container orchestration
EKS → Managed Kubernetes

Simple workflows:

Docker → ECR → ECS → Running Tasks
Docker → ECR → EKS → Kubernetes Pods
#AWS #ECS #EKS #Docker #Kubernetes #DevOps

[Om Sharma @OpSharma167]

AWS CLI = Manage AWS services from the terminal.

aws ec2 describe-instances
aws s3 ls
aws iam list-users

🔹 Automate AWS tasks
🔹 Create & manage resources
🔹 Use scripts & CI/CD
🔹 Integrate with DevOps tools

#AWS #AWSCLI #DevOps #CloudComputing #Automation