DevOps & Cloud (AWS, AZURE, GCP) Tech Free Learning

💘 𝐀𝐳𝐮𝐫𝐞 𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 | 𝐇𝐚𝐩𝐩𝐲 𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 💘 Microsoft Applied Skills 💘Azure Lab Simulations on Configure secure access to your workloads using Azure networking Microsoft lab simulations are nice way to skill up quickly and easily. These hands-on learnings make you update and confidence on Azure networking services. 💘Labs ✔️ [ Lab] Configure virtual networks https://lnkd.in/dvZxRZ-X ✔️ [ Lab] Configure Azure Virtual Network peering https://lnkd.in/dfwDznxi ✔️ [ Lab] Create custom routes https://lnkd.in/d5X83Ajr ✔️ [ Lab] Create an NVA and virtual machines https://lnkd.in/dynCtY3m ✔️ [ Lab] Create public and private virtual machines https://lnkd.in/dcRzDDDy ✔️ [ Lab] Create a DNS zone and an A record by using Azure DNS https://lnkd.in/dZXHmk7v ✔️ [ Lab] Create alias records for Azure DNS https://lnkd.in/d9ZVRmNg ✔️ [ Lab] Configure network security groups https://lnkd.in/dgVfwFjR ✔️ [ Lab] Provide network isolation and segmentation for the web application https://lnkd.in/dvJg_bat ✔️ [ Lab] Control the network traffic to and from the web application https://lnkd.in/d-ddKK-s ✔️ [ Lab] Exercise - Protect the web application from malicious traffic and block unauthorized access https://lnkd.in/dTCBEidM ✔️ [ Lab] Operationalize and enforce policy to filter traffic https://lnkd.in/dKJrKXUu ✔️ [ Lab] Record and resolve domain names internally https://lnkd.in/dTUghhTb 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🔥 Becoming a Certified Kubernetes Administrator, an EXPERT in K8s from scratch, and much MORE! 🔥 🔗 Link: https://github.com/NotHarshhaa/Certified_Kubernetes_Administrator If you want to become a Certified Kubernetes Administrator, or you want to become an EXPERT in Kubernetes, learn Kubernetes from scratch and understand everything, this repo is a good choice. 🟡 Table of Contexts: 1. Kubernetes 2. Helm 3. Operator 4. Prometheus 5. EKS ❤️ 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🚨 Real Interview Questions – DevOps Engineer 𝑃𝑊𝐶 💥 ℹ️ 𝐑𝐨𝐮𝐧𝐝 𝟏: 𝐒𝐜𝐫𝐞𝐞𝐧𝐢𝐧𝐠 𝐑𝐨𝐮𝐧𝐝 1. Walk me through your current project architecture and your role in it. 2. Which DevOps tools have you worked with in the last 2 years? 3. What AWS services have you used in production? 4. Describe your experience with CI/CD pipelines. 5. How do you expose a Kubernetes application to external traffic? 6. What is the difference between Deployment and StatefulSet in Kubernetes? 7. What is a ConfigMap, and how is it different from a Secret? 8. What is the purpose of a NAT Gateway? 9. How do you check network connectivity between two servers? 10. How do you check running processes in Linux? 11. What command would you use to find files larger than 100MB? ℹ️ 𝐑𝐨𝐮𝐧𝐝 𝟐: 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐑𝐨𝐮𝐧𝐝 (𝟔𝟎 𝐦𝐢𝐧𝐬) 1. You have an application in Account A that needs to access an S3 bucket in Account B. How would you configure this? 2. Your EC2 instance in a private subnet needs to download packages without a NAT Gateway. What alternatives exist? 3.How would you set up geolocation-based routing using AWS services? 4. Write a Dockerfile for a Node.js application with multi-stage builds. 5. What's the difference between COPY and ADD commands in Dockerfile? 6.How do you debug a container that has exited? 7.How would you handle secrets in a Docker container for a PHP application connecting to MySQL? 8. How would you implement blue-green deployment in Kubernetes? 9. How do you implement network policies to restrict pod-to-pod communication in Kubernetes? 10. critical production Kubernetes cluster is experiencing multiple issues: Pods stuck in ImagePullBackOff Pods being evicted Users reporting 503 errors 11. What troubleshooting steps will you follow, and how to avoid this in the future? 12. How do you handle Terraform state file corruption? 13. You need to import an existing AWS VPC into Terraform. What are the steps? 14. How do you manage secrets in Terraform without hardcoding them? 15. How would you implement cross-account resource provisioning using Terraform? 16. An S3 bucket was created via Terraform, but someone manually added a policy. How do you handle this drift? 17. Write a Python script to backup all files older than 30 days from a directory. 18. Your company's cloud costs are increasing rapidly. How would you approach cost optimization without impacting performance? 📱 𝐅𝐨𝐥𝐥𝐨𝐰 𝐦𝐞 𝐨𝐧 𝐆𝐢𝐭𝐇𝐮𝐛 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐃𝐞𝐯𝐎𝐩𝐬 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 : https://github.com/NotHarshhaa 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

♻️ 10 FREE DevOps labs that helped to stop feeling stuck — and start feeling unstoppable ⬇️ 1. KodeKloud Engineer Platform Simulate real-world tasks. Get “promoted” from SysAdmin → DevOps Engineer → Architect! 📎 https://lnkd.in/g3G_vMNU 2. DevOps Labs Collection Hands-on labs across CI/CD, monitoring, automation — no credit card needed. 📎 https://lnkd.in/g8HVvigm 3. Kubernetes Lab Deploy clusters, manage apps, master YAML. 📎 https://lnkd.in/guWWzCeh 4. Docker Lab Pull, build, and run real containers. 📎 https://lnkd.in/gFyeEnrT 5. Git Lab Master Git flows, branching, merges — fluency guaranteed. 📎 https://lnkd.in/grP6dYfa 6. Terraform Lab Write Infrastructure as Code. Deploy AWS resources without fear. 📎 https://lnkd.in/gmhTZPdR 7. Linux Lab Learn Linux basics — 90% of DevOps work happens here. 📎 https://lnkd.in/g92cPyYE 8. Ansible Lab Automate server setups like a pro. 📎 https://lnkd.in/gVGdesdB 9. Jenkins Lab Build real CI/CD pipelines with hands-on Jenkins experience. 📎 https://lnkd.in/gPdeqhYZ 10. Python Lab Practice automation scripts and cloud operations. 📎 https://lnkd.in/g-gM9QmM 💡 Join the channel now and start your DevOps journey with confidence: 📎 t.me/DevOpsClassroom

🚀 DevOps Project: Deploy a 3 Tier Architecture On AWS - End to End Project Project Overview: ⚡️ Tier 1: Presentation Layer ✅ Create a web application using a framework like React, Angular, or Vue.js. ✅ Host the frontend on Amazon S3 or use AWS Amplify for a serverless frontend deployment. ⚡️ Tier 2: Application Layer ✅ Develop a server-side application using a technology like Node.js, Python, or Java. ✅ Deploy the application on AWS Elastic Beanstalk or AWS Lambda for serverless applications. ✅ Use Amazon API Gateway for creating RESTful APIs or AWS App Runner for containerized applications. ⚡️ Tier 3: Data Layer ✅ Choose a database solution like Amazon RDS (Relational Database Service), Amazon DynamoDB (NoSQL), or Amazon Aurora (MySQL/PostgreSQL). ✅ Configure database security groups and access controls. ✅ Ensure data backup and redundancy as per your application's needs. Check for full details 👇 📱 Link: https://github.com/NotHarshhaa/DevOps-Projects/tree/master/DevOps-Project-01 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

⬇️ 8 Must Know Docker Concepts : 🔹 Docker 🐬 completely changes the game by making your app portable and consistent across environments. 1️⃣. Dockerfile ⚡️ What it does : Automates image creation step by step. ⚡️ Key Commands : • docker build -t my-app . → Build an image from a Dockerfile. • docker history <image-name> → See how the image was built. 2️⃣. Docker Image ⚡️ What it does : It is the read-only blueprint for containers, packaging your app with its dependencies. ⚡️ Key Commands : • docker images → List all images. • docker rmi <image-name> → Remove an image. • docker inspect <image-name> → View image details. 3️⃣. Docker Container It is a running instance of an image. ⚡️ What it does : Runs your app in isolated environments. ⚡️ Key Commands : • docker run -d -p 8080:80 nginx → Run a container in detached mode. • docker ps → List running containers. • docker exec -it <container-id> /bin/bash → Access the container shell. • docker logs <container-id> → View logs from a running container. • docker stop <container-id> → Stop a container. 4️⃣. Docker Registry It stores and distributes Docker images (e.g., DockerHub). ⚡️ What it does: Enables sharing and versioning of images. ⚡️ Key Commands : • docker login → Authenticate to a registry. • docker push <repo/image-name> → Push an image to the registry. • docker pull <repo/image-name> → Download an image from the registry. • docker tag <image> <repo/image:tag> → Add a tag to an image. 5️⃣. Docker Volumes ⚡️ What it does: Keeps data even if the container is deleted. ⚡️ Key Commands : • docker volume create my-data → Create a volume. • docker volume ls → List all volumes. • docker volume rm my-data → Remove a volume. 6️⃣. Docker Compose It is used to define and run multi-container Docker applications using a simple YAML file. ⚡️ What it does : Orchestrates services, networks, and volumes for multiple containers. ⚡️ Key Commands : • docker-compose up → Start services. • docker-compose down → Stop and remove services. • docker-compose logs → View logs of all services. • docker-compose ps → See the status of containers. 7️⃣. Docker Networks It allow containers to communicate securely. ⚡️ What it does : Ensures isolated and connected environments for containers. ⚡️ Key Commands : • docker network create my-network → Create a network. • docker run --network my-network nginx → Run a container in a network. • docker network inspect my-network → View details of a network. • docker network prune → Remove unused networks. 8️⃣. Docker CLI A command-line interface for managing Docker. ⚡️ What it does: Simplifies everything from building images to managing containers. ⚡️ Common Commands : • docker build -t my-app . → Build an image. • docker run -d -p 8080:80 my-app → Run a container. • docker ps -a → List all containers (running & stopped). • docker stop <container-id> → Stop a container. • docker system prune → Clean up unused images, containers, and volumes. 📱 𝐅𝐨𝐥𝐥𝐨𝐰 𝐦𝐞 𝐨𝐧 𝐆𝐢𝐭𝐇𝐮𝐛 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐃𝐞𝐯𝐎𝐩𝐬 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 : https://github.com/NotHarshhaa 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

➡️ New DevOps Project Alert! ⬅️ 🚀 DevOps Project-36: Production-Ready 3-Tier App on AWS EKS 🌐 Just deployed a full-stack 3-tier application on AWS EKS with a real-world infrastructure setup! 🧵 🟠 Frontend: React (user interface) 🟠 Backend: Flask (API + business logic) 🟠 Database: PostgreSQL on RDS (private subnet) Key AWS Components: ✅ EKS Cluster ✅ Application Load Balancer (ALB) via AWS Load Balancer Controller ✅ Kubernetes Ingress, Secrets & ConfigMaps ✅ ExternalName service to access RDS securely ✅ Route53 for DNS ✅ IAM, OIDC for fine-grained access control ✅ EC2 Bastion Host for secure cluster access ✅ DB migrations via Kubernetes Job 🔧 Built with production in mind – real infrastructure, real patterns, real skills. 📱 GitHub: https://github.com/NotHarshhaa/DevOps-Projects/tree/master/DevOps-Project-36 ➗ View on Web: https://projects.prodevopsguytech.com/blog/DevOps-Project-36 Check it out & give it a ⭐️ if it helps you! #DevOps #AWS #EKS #Kubernetes #CICD #FullStack #CloudNative #React #Flask #Postgres 📱 Join the channel now and start your DevOps journey with confidence: 📎 t.me/DevOpsClassroom

🔖 Save this and never get confused with the Docker Exist codes again ℹ️ Common Exit Codes in Docker 🐬 ➡️ Exit Code: 0 Success – container's main process ran and exited without error ➡️ Exit Code: 1 General error – something went wrong inside the container ➡️ Exit Code: 126 Command invoked cannot execute (permission issue or invalid binary) ➡️ Exit Code: 127 Command not found (e.g., CMD or ENTRYPOINT points to a missing file) ➡️ Exit Code: 128 Invalid argument to exit() ➡️ Exit Code: 137 Killed (e.g., OOMKilled or SIGKILL by Docker) ➡️ Exit Code: 139 Segmentation fault ➡️ Exit Code: 143 Gracefully stopped with SIGTERM (e.g., docker stop) 📱 𝐅𝐨𝐥𝐥𝐨𝐰 𝐦𝐞 𝐨𝐧 𝐆𝐢𝐭𝐇𝐮𝐛 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐃𝐞𝐯𝐎𝐩𝐬 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 : https://github.com/NotHarshhaa 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

A Dockerfile 🐬 is a text-based document that provides instructions for creating a container image. Let's walk through the basics of writing one: 1. Choose a Base Image: Start by specifying the base image you want to use. It serves as the foundation for your custom image. For example:

FROM node:14

2. Set the Working Directory: Use the WORKDIR instruction to define the working directory inside the container:

WORKDIR /usr/src/app

3. Copy Files: Use COPY or ADD to copy files from your local machine into the image:

COPY package\.json package-lock\.json \./

4. Install Dependencies: Run any necessary commands to install dependencies (e.g., using RUN npm install for Node.js):

RUN npm install

5. Expose Ports: Specify which ports your application will listen on using EXPOSE:

EXPOSE 3000

6. Define Startup Command: Finally, set the command that runs when the container starts:

CMD ["npm", "start"]

Remember, this is just a basic example. You can customize your Dockerfile based on your specific application and requirements.

For a hands-on tutorial, check out this Dockerfile tutorial from Docker's official documentation. [1] ➡️Reference links: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] 📱 𝗙𝗼𝗹𝗹𝗼𝘄 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🚨 Kubernetes Troubleshooting Cheatsheet 🛠 1⃣) Confirm cluster and namespace ⚫️ Check current context: kubectl config current-context ⚫️ List contexts: kubectl config get-contexts ⚫️ Switch context: kubectl config use-context <name> ⚫️ List namespaces or pods in a namespace: kubectl get ns and kubectl get pods -n <namespace> 2⃣) Get the big picture: nodes, pods and events 🔴 Nodes: kubectl get nodes 🔴 All pods: kubectl get pods -A 🔴 All deployments: kubectl get deployments -A 🔴 Recent events: kubectl get events --sort-by=.metadata.creationTimestamp -A 3⃣) Inspect the failing pod 🟣 Describe the pod: kubectl describe pod <pod> -n <ns> 🟣 View logs: kubectl logs <pod> -n <ns> 🟣 Logs for a specific container: kubectl logs <pod> -c <container> -n <ns> 🟣 Open a shell inside the pod: kubectl exec -it <pod> -n <ns> -- /bin/sh 4⃣) Check probes and health 🟢 See readiness and liveness probe info in kubectl describe output 🟢 Test the probe endpoint from inside the pod: 🟢 kubectl exec -it <pod> -n <ns> -- curl -sv localhost:<port>/health 🟢 If probes fail, consider adjusting timeouts or probe settings 5⃣) Rollouts, history and recovery 🟠 Check rollout status: kubectl rollout status deployment/<name> -n <ns> 🟠 View rollout history: kubectl rollout history deployment/<name> -n <ns> 🟠 Rollback if needed: kubectl rollout undo deployment/<name> -n <ns> 6⃣) Networking and services 🟤 List services: kubectl get svc -n <ns> 🟤 Check endpoints: kubectl get endpoints -n <ns> 🟤 DNS test from a pod: kubectl exec -it <pod> -n <ns> -- nslookup <service> 🟤 Quick local test with port-forward: kubectl port-forward svc/<svc> 8080:80 -n <ns> 7⃣) Storage: PVC and PV checks 🟡 List PVCs: kubectl get pvc -n <ns> 🟡 Describe a PVC: kubectl describe pvc <pvc> -n <ns> 🟡 Look for mount errors in the pod describe output 8⃣) Resources, logs and quick fixes 🔵 Resource usage: kubectl top nodes and kubectl top pods -n <ns> 🔵 Tail logs across pods with tools like stern or kubetail 🔵 Restart deployment: kubectl rollout restart deployment/<name> -n <ns> 🔵 Recreate a pod safely: kubectl delete pod <pod> -n <ns> (controller will recreate it) 📱 𝐅𝐨𝐥𝐥𝐨𝐰 𝐦𝐞 𝐨𝐧 𝐆𝐢𝐭𝐇𝐮𝐛 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐃𝐞𝐯𝐎𝐩𝐬 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 : https://github.com/NotHarshhaa 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @devopsclassroom 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

⚡️Jenkins Tutorial For Beginners: 21+ Practical Guides https://lnkd.in/deezunqE ⚡️Jenkins Architecture Explained - Beginners Guide https://lnkd.in/dcE49EXw ⚡️How To Setup Highly Available Jenkins https://lnkd.in/dTbnsg6s 🔠 Jenkins Administration Tutorials ⚡️Install Jenkins on Ubuntu in 10 Easy Steps https://lnkd.in/dUDGXc34 ⚡️How to Setup Jenkins Agent Using SSH [Password & SSH Key] https://lnkd.in/d4iKkjs7 ⚡️How to Configure SSL on Jenkins Server https://lnkd.in/d9UpFgiR ⚡️How To Run Jenkins on Port 80: 4 Different Methods Explained https://lnkd.in/dpexCUub ⚡️How To Backup Jenkins Data and Configurations https://lnkd.in/dePTnDGX ⚡️How to Setup Custom UI Theme For Jenkins https://lnkd.in/dxdqcjWJ ⚡️Jenkins Setup Using AWS Autoscaling Group, Load Balancer & EFS https://lnkd.in/dizsnNjZ 🔠 Jenkins Pipeline Tutorials ⚡️Jenkins Pipeline Tutorial For Beginners https://lnkd.in/dryfkdVy ⚡️Jenkins Shared Library Tutorial For Beginners https://lnkd.in/dsAgwHFp ⚡️How to Use Parameters in Jenkins Declarative Pipeline https://lnkd.in/d3UgPxRA 🔠 Jenkins CI/CD Tutorials ⚡️Java Continuous Integration with Jenkins - Beginners Guide https://lnkd.in/d9Eujsp6 ⚡️Jenkins Automated Build Trigger On Github Pull Request https://lnkd.in/dFkNt3gm ⚡️How To Build Docker Image In Kubernetes Pod https://lnkd.in/dfxkmf_v ⚡️How to Setup Jenkins Email Notification (Detailed Guide) https://lnkd.in/dUbxPqvb 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🚀 From Docker to Kubernetes [v1.9.0] Release 🔥 Big new drop! We've added advanced topics and real-world strategies across Docker & Kubernetes—take your skills to the next level! 👨‍💻⚙️ 🐳 Docker Section – Expanded! 🔼 Added Docker Observability Platforms guide covering monitoring, logging, tracing, and advanced observability practices 🔼 Added Docker Service Discovery & DNS documentation with comprehensive networking and service location strategies 🔼 Added Docker Secrets Management guide covering secure storage and distribution of sensitive information ☸️ Kubernetes Section – Leveled Up! 🔼 Added Kubernetes Admission Controllers guide for implementing dynamic security policies and governance controls 🔼 Added Kubernetes Resource Requests & Limits documentation for optimizing compute resource allocation 🔼 Added Kubernetes Cluster API guide covering declarative infrastructure management for Kubernetes clusters 📌 Dive in now & level up your DevOps journey! ➗ dockertokubernetes.live ✉️ Read more about v1.9.0: https://www.dockertokubernetes.live/blog/v1-9 📱 𝐅𝐨𝐥𝐥𝐨𝐰 𝐦𝐞 𝐨𝐧 𝐆𝐢𝐭𝐇𝐮𝐛 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐃𝐞𝐯𝐎𝐩𝐬 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 : https://github.com/NotHarshhaa 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🖥 Recent Asked Interview Questions: 𝗦𝗲𝗿𝘃𝗶𝗰𝗲 𝗕𝗮𝘀𝗲𝗱 𝗖𝗼𝗺𝗽𝗮𝗻𝘆 🔠Role: 𝗗𝗲𝘃𝗢𝗽𝘀/𝗖𝗹𝗼𝘂𝗱 𝗦𝘂𝗽𝗽𝗼𝗿𝘁 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿 🔠Exp Range : 𝟯-𝟱 𝘆𝗿𝘀 1. What is the role of IAM roles and policies? 2. Can you explain the Terraform plan and its purpose? 3. What is AWS Lambda, and how does it work? 4. How do you invoke a Lambda function, and where do you configure it? 5. Can you describe how Lambda handles scaling and event-based invocations? 6. What is Amazon CloudWatch, and have you configured any custom metrics? 7. What metrics are available on your CloudWatch dashboard? 8. How do you configure CPU utilization on your CloudWatch dashboard? 9. How do you attach an SSL certificate to an S3 bucket? 10. What type of encryption have you implemented in your project? 11. If an S3 bucket has a read-only policy, can you modify objects in the bucket? 12. Why did you choose Terraform over Boto3 for infrastructure provisioning? 13. What is a Content Delivery Network (CDN), and how does it work? 14. Have you created a Jenkins pipeline for your project? 15. How do you attach policies to IAM users, either individually or by group? 16. What type of deployment strategies are you using in your project? 17. Have you used any tools to create customized Amazon Machine Images (AMIs)? 18. What is connection draining, and how does it work? 19. How does an Elastic Load Balancer (ELB) distribute traffic? 20. What is auto-scaling, and how does it work? 21. Can you describe the different types of Load Balancers and provide examples? 22. What is the maximum runtime for a Lambda function? 23. What is the maximum memory size for a Lambda function? 24. How can you increase the runtime for a Lambda function? 25. What automations have you performed using Lambda in your project? 26. Why did you choose Terraform over Boto3 for infrastructure provisioning? 27. What modules have you used in your Lambda function? 28. Have you created an SNS topic for your project? 29. If you've exhausted IP addresses in your VPC, how would you provision new resources? 30. What is Groovy, and how is it used in Jenkins? 31. Why do you use Groovy in Jenkins, and where do you save Jenkins files? 32. What is Ansible, and what is its purpose? 33. What language do you use in Ansible? 34. Where do you run Terraform code, remotely or locally? 35. What is the purpose of access keys and secret keys in AWS? 36. What are Terraform modules, and have you used any in your project? 37. What environments have you set up for your project? 38. Do you use the same AWS account for all environments? 39. Do you have separate Jenkins servers for each environment? 40. Where do you write and save your Lambda function code? 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

➡️ Mastering GitHub Actions for DevOps Engineers: A Complete Guide from Beginner to Advanced ✅ 🖥 Read it now: https://dev.to/prodevopsguytech/mastering-github-actions-for-devops-engineers-a-complete-guide-from-beginner-to-advanced-2lc1 Are you ready to level up your DevOps skills with GitHub Actions? Whether you're a beginner or an experienced engineer, this comprehensive guide has everything you need to know about automating CI/CD pipelines, integrating with popular DevOps tools, and optimizing workflows. 🔥 Topics Covered: ✅ Core Concepts (Workflows, Jobs, Actions) ✅ CI/CD Pipeline Automation ✅ Advanced Concepts like Matrix Builds & Self-Hosted Runners ✅ Best Practices for Optimization ✅ Real-World Use Cases

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🎄 𝗙𝗼𝗹𝗹𝗼𝘄 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🚀 DevOps Interview Hub is Live! ▶️ Your all-in-one resource for DevOps, Cloud, and SRE interview preparation is here! Whether you're just starting out or you're a seasoned pro, this hub has something for you. 🌐 Explore the hub: interviews.prodevopsguytech.com 🔍 What's Inside? ✅ 550+ curated interview questions with detailed answers ✅ Coverage of major DevOps tools & cloud platforms ✅ Deep dives into core concepts & best practices ✅ Beginner-friendly, yet powerful for experienced engineers 📘 How to Start: 1️⃣ Visit the docs: interviews.prodevopsguytech.com/docs 2️⃣ Explore topics like Cloud, CI/CD, Scripting, and more 3️⃣ Use search to pinpoint exactly what you need 4️⃣ Level up with expert explanations and real-world examples 🔗 Start mastering DevOps now! #DevOps #SRE #Cloud #DevOpsInterview #CareerGrowth #TechResources 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🖥 Essential DevOps Commands, All in One Visual ⚡️DevOps isn’t just about tools. It’s about speed, collaboration, and automation. ⏩ Here’s a quick-reference guide filled with essential commands across the DevOps stack: - Linux for system management - Git for version control - Docker for containerization - Kubernetes for orchestration - Jenkins for CI/CD - Terraform for IaC - Ansible for configuration - AWS CLI for cloud control Whether you're learning or already working in DevOps, this image is a useful reference. 🔖Save it. Share it. Use it. Let’s help more people gain DevOps knowledge! 📱 𝐅𝐨𝐥𝐥𝐨𝐰 𝐦𝐞 𝐨𝐧 𝐆𝐢𝐭𝐇𝐮𝐛 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐃𝐞𝐯𝐎𝐩𝐬 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 : https://github.com/NotHarshhaa 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🚨 Interview Questions – Sr. DevOps Engineer Siemens 🧠💥 If you're preparing for mid to senior-level roles in DevOps, Cloud, or Platform Engineering — this list might help you benchmark your readiness. 🔹 𝐊𝐮𝐛𝐞𝐫𝐧𝐞𝐭𝐞𝐬 Q. What is the difference between a Deployment and a StatefulSet in Kubernetes? Q. When should you use a StatefulSet instead of a Deployment? Q. Can you attach a volume to a Deployment? If yes, how is it different from a StatefulSet? Q. What could cause a StatefulSet pod to fail when rescheduled to a different availability zone? Q. How do PV/PVC behave across zones in EKS or Kubernetes in general? Q. What is a DaemonSet and when would you use it? Q. If you want two pods per node (instead of one), what alternatives to DaemonSet can you use? Q. What is a Pod Disruption Budget (PDB) and how is it useful? Q. How do you handle certificate rotation in on-prem Kubernetes clusters? Q. What are the challenges with scheduling pods in a multi-node, multi-AZ setup? Q. How does the Kubernetes scheduler decide where to place pods? Q. What happens when a StatefulSet pod cannot mount its volume after moving to another node? 🔹 𝐓𝐞𝐫𝐫𝐚𝐟𝐨𝐫𝐦 Q. What are common challenges faced while working with Terraform? Q. How do you handle state file management in Terraform? Q. How do you detect and resolve drift in Terraform-managed infrastructure? Q. How do you manage secrets securely in Terraform? Q. Why should you use a remote backend for Terraform? 🔹 𝐀𝐖𝐒 & 𝐍𝐞𝐭𝐰𝐨𝐫𝐤𝐢𝐧𝐠 Q. What are all the possible ways to deploy an Nginx server on AWS? Q. What are the pre-requisites for VPC peering between two VPCs? Q. What problems occur when two VPCs have overlapping CIDR blocks? Q. How can you enable communication between overlapping CIDR VPCs? Q. What is a Transit Gateway and how does it help in VPC communication? Q. How can a jump server be used in overlapping network scenarios? Q. Can you explain transitive routing between VPCs A, B, and C? 🔹 𝐂𝐈/𝐂𝐃 – 𝐆𝐢𝐭𝐇𝐮𝐛 𝐀𝐜𝐭𝐢𝐨𝐧𝐬 Q. What CI/CD tools have you used in your current role? Q. How are you integrating tools like SonarQube, Docker, and Trivy in your pipelines? Q. How do you trigger a GitHub Actions workflow in another repository? Q. What is the purpose of repository_dispatch in GitHub Actions? Q. How would you trigger a CI/CD pipeline in Repo A from changes in Repo B? 📱 𝐅𝐨𝐥𝐥𝐨𝐰 𝐦𝐞 𝐨𝐧 𝐆𝐢𝐭𝐇𝐮𝐛 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐃𝐞𝐯𝐎𝐩𝐬 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 : https://github.com/NotHarshhaa 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🚀 Update Alert! 📢 Our DevOps Interview repository just got bigger and better! 🟢 We’ve expanded with two brand-new sections: 🖥 Linux & System Administration – Master commands, processes, and troubleshooting like a pro. 📱 Git & Version Control – Learn branching strategies, conflict resolution, and commit best practices. 💡 Perfect for interviews, hands-on practice, and quick references. 💾 Star & Explore Now: 📱 GitHub Repo: https://github.com/NotHarshhaa/DevOps-Interview-Questions 📱 Follow me on GitHub: https://www.github.com/NotHarshhaa 📱 Follow @prodevopsguy for more content around Cloud & DevOps!!! // Join for DevOps DOCs: @devopsdocs

📱 How Kubernetes Works: End-to-End Explained Simply 1. Cluster Setup You begin by setting up a Kubernetes cluster, which includes a control plane and one or more worker nodes. 2. Define Your Application You describe your application using YAML configuration files—these define resources like Deployments, Services, ConfigMaps, etc. 3. Apply Configuration You apply the YAML files using kubectl apply -f <file>. This sends your request to the API Server, which is the central management component of the cluster. 4. API Server Processing Kubernetes processes the request and decides: Whether to create a new resource (e.g., Pod, Deployment) Update or delete an existing resource Or trigger a controller to take action 5. Store in etcd The API Server stores the resource’s specification in etcd, the cluster’s key-value store and source of truth. 6. Controller Detects Change A relevant controller (e.g., ReplicaSet Controller) detects the new spec and responds accordingly. 7. Resource Creation The controller initiates resource creation, instructing the scheduler to deploy Pods. 8. Scheduling The scheduler assigns Pods to appropriate nodes based on current resource availability and scheduling policies. 9. Kubelet Interaction Once assigned, the Kubelet on the target node receives the Pod specification and requests the container runtime to start the container. 10. Container Deployment The container runtime pulls the required image, creates the container, and runs it inside the Pod. 11. Network Assignment The CNI plugin (Container Network Interface) assigns a network identity to the Pod. It gets an IP address and joins the cluster network. 12. Service Routing with kube-proxy kube-proxy sets up the routing rules to allow Services to forward traffic to the appropriate and healthy Pods. 📱 𝐅𝐨𝐥𝐥𝐨𝐰 𝐦𝐞 𝐨𝐧 𝐆𝐢𝐭𝐇𝐮𝐛 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐃𝐞𝐯𝐎𝐩𝐬 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 : https://github.com/NotHarshhaa 📱 𝐅𝐨𝐥𝐥𝐨𝐰 @devopsclassroom 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs

🚀 Mastering Ansible for Automation and Server Management 🛠 Just wrapped up a comprehensive guide on setting up Ansible for automating server management, provisioning, and configuration! Here's what we covered 🔑 Key Topics Discussed: 1️⃣ What is Ansible? An open-source tool for automation, known for its simplicity and agentless architecture. 2️⃣ Setting Up Master & Worker Nodes: Step-by-step instructions to configure Ansible on multiple servers, including SSH key setup and hosts file configuration. 3️⃣ Modules and Commands: Examples of ad hoc commands to check server status, install packages like NGINX, and troubleshoot issues. 4️⃣ Common Errors and Troubleshooting: How to resolve permission issues and other common challenges in Ansible setups. 5️⃣ Installing and Managing NGINX and Docker: Automating the installation and management of NGINX and Docker on Ubuntu and redhat Linux 2 servers. 6️⃣ Introduction to Inventory and Playbooks: A glimpse into inventory file configurations and a teaser for the next post about creating and using playbooks in Ansible. ▶️ Why Ansible? With its agentless approach, YAML-based playbooks, and Python dependencies, Ansible is a game-changer for: ✅ Server provisioning ✅ Configuration management ✅ Application deployment ✅ Continuous delivery and orchestration ⚡️More Info: HERE ✈️ 𝗙𝗼𝗹𝗹𝗼𝘄 @prodevopsguy 𝐟𝐨𝐫 𝐦𝐨𝐫𝐞 𝐬𝐮𝐜𝐡 𝐜𝐨𝐧𝐭𝐞𝐧𝐭 𝐚𝐫𝐨𝐮𝐧𝐝 𝐜𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬!!! // 𝐉𝐨𝐢𝐧 𝐟𝐨𝐫 𝐃𝐞𝐯𝐎𝐩𝐬 𝐃𝐎𝐂𝐬: @devopsdocs