♾ DevOps Zero to Hero ♾


🖥 AWS Zero to Hero Course
🔠https://lnkd.in/dgZ446me

🖥 DevOps Zero to Hero Course
🔠https://lnkd.in/dbfYhieG

🖥 Terraform Zero to Hero
🔠https://lnkd.in/dafDXUh6

🖥 Docker
🔠https://lnkd.in/dV2myVq6

🖥 Kubernetes
🔠https://lnkd.in/dynrCFVy

🖥 Observability Zero to Hero
🔠https://lnkd.in/dHwdSa4W

🖥 Azure Zero to Hero
🔠https://lnkd.in/d3PCGrrA

🖥 What is CICD ?
🔠https://lnkd.in/d7EN3Ymi

🖥 Jenkins ZERO to HERO
🔠https://lnkd.in/dvPCQ9XZ

🖥 Real-Time Projects for DevOps and Cloud
🔠https://lnkd.in/dtuqFPNQ

🖥 GitOps & Argo CD
🔠https://lnkd.in/dBCpzJ5f

🖥 Python for DevOps
🔠https://lnkd.in/dewqThFz

🖥 Shell Scripting for DevOps
🔠https://lnkd.in/dbXVPbyT

🖥 Ansible Zero to Hero
🔠https://lnkd.in/df_Gnn74

🖥 Real DevOps Podcasts
🔠https://lnkd.in/ds6XAx_S


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

🚀 Networking is the backbone of DevOps!


As DevOps Engineers, understanding how services communicate across environments is crucial for debugging, securing, and optimizing systems.

Here’s a quick reference list of common network ports that every DevOps and Cloud Engineer should be familiar with — from HTTP and SSH to Kubernetes, Docker, Redis, and Prometheus.

🌝Knowing these ports helps when:
✅ Configuring firewalls and security groups
✅ Troubleshooting connectivity issues
✅ Building secure CI/CD and cloud infrastructures

💡 Solid networking knowledge = stronger DevOps foundation.

📱 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

🖥 Kubernetes interview Questions: ❓


❗️ Phase 1: Foundations (Day 1–5)

⚡️Day 1 – Introduction to Kubernetes

1. What is Kubernetes, and why do we use it?
2. Difference between Kubernetes and Docker Swarm?
3. Explain the architecture of Kubernetes (Master vs Worker nodes).
4. What is a Pod in Kubernetes?
5. What is the role of kube-apiserver, kube-scheduler, and etcd?
6. How does Kubernetes provide high availability?
7. What problem does Kubernetes solve compared to running apps directly on VMs?

⚡️Day 2 – Pods

1. What is a Pod in Kubernetes?
2. Can a Pod run multiple containers? If yes, why would you need that?
3. What’s the difference between a Pod and a container?
4. How do you check the logs of a Pod?
5. What happens if a Pod dies?
6. Difference between kubectl apply and kubectl create when creating Pods?
7. What is the difference between a static Pod and a normal Pod?

⚡️Day 3 – ReplicaSets

1. What is a ReplicaSet in Kubernetes?
2. How is a ReplicaSet different from a ReplicationController?
3. If a Pod managed by a ReplicaSet is deleted, what happens?
4. Can we scale a ReplicaSet manually? If yes, how?
5. How does a ReplicaSet ensure high availability?
6. Explain the relationship between ReplicaSet and Deployment.
7. Which object controls Pods directly: Deployment or ReplicaSet?

⚡️Day 4 – Services

1. What is a Service in Kubernetes?
2. Explain the different types of Services (ClusterIP, NodePort, LoadBalancer, ExternalName).
3. Which is the default Service type in Kubernetes?
4. How does a Service communicate with Pods?
5. What is kube-proxy, and what is its role in Services?
6. Difference between ClusterIP and NodePort?
7. How do Services help achieve loose coupling between microservices?

⚡️Day 5 – Deployments

1. What is a Deployment in Kubernetes?
2. Difference between Deployment and ReplicaSet?
3. How do Deployments achieve zero-downtime updates?
4. What is a rolling update strategy in Deployments?
5. How do you rollback a Deployment?
6. What are readiness and liveness probes, and why are they important?
7. How does Deployment ensure fault tolerance?


📱 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

🚀 AWS Project 02: WordPress Hosting Architecture using AWS VPC, EC2, RDS & S3 (Intermediate) 🌐

We’re diving deep into real-world AWS architecture! In this project, you’ll build a complete WordPress hosting environment step by step — learning how different AWS services integrate to create a secure, scalable web application.

🧩 What You’ll Build:
- A custom VPC with both public and private subnets
- An EC2 instance hosting a WordPress application
- A MySQL RDS database in a private subnet
- An S3 bucket for storing static website assets

⚙️ Key Skills Covered:
- AWS Networking (VPC, Subnets, Security Groups)
- EC2 Instance Setup & WordPress Installation
- RDS Database Integration
- S3 for Static Content Hosting

🧠 Prerequisites:
- An AWS account with permissions to create IAM roles, VPCs, EC2, and RDS
- Basic knowledge of AWS services

🌍 Goal:
By the end of this project, you’ll have a fully functional WordPress site hosted on AWS — designed using industry best practices for networking, scalability, and security.

📂 Project Repository:
📱 https://github.com/NotHarshhaa/AWS-Projects/tree/master/AWS-Project-01


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

📱 30 Kubernetes Tutorials

Each one focused on a key concept, tool, or best practice.

1. Kubernetes Architecture - https://lnkd.in/gSB2GyXp
2. High Availability - https://lnkd.in/gzYd97Ee
3. Best Practices (Design & Setup) - https://lnkd.in/gPUx8uNP
4. Minikube - https://lnkd.in/gAgcw2q6
5. Kubeadm - https://lnkd.in/gkCQAajB
6. Kubeconfig File - https://lnkd.in/gEnUdrj7
7. Vagrant VMs - https://lnkd.in/gtKNepyc
8. eksctl - https://lnkd.in/ghUDuDQx
9. kubectl - https://lnkd.in/gzbd7263
10. Kubernetes Cluster - https://lnkd.in/giaAps_S
11. Etcd - https://lnkd.in/g9icGcME
12. Kubernetes Pod - https://lnkd.in/gtGGyJR7
13. Init Containers - https://lnkd.in/gPaDpyUP
14. Daemonset - https://lnkd.in/gAM7pxrK
15. Pod Lifecycle - https://lnkd.in/gtwBJr3w
16. Kubernetes Ingress - https://lnkd.in/gN2RD3ei
17. Nginx Ingress - https://lnkd.in/ghvGtGS3
18. K8s YAML Manifests - https://lnkd.in/gJQ-pPJE
19. Alert Manager - https://lnkd.in/gHM6DnFE
20. EFK Stack - https://lnkd.in/gSC6bj37
21. K8s Logging - https://lnkd.in/g8VG6nti
22. Kustomize - https://lnkd.in/gziADVvS
23. Sealed Secrets - https://lnkd.in/gceD9mpU
24. Docker Image In K8s Pod - https://lnkd.in/g4qUgj4E
25. Jenkins Build Agents - https://lnkd.in/gf9R-qin
26. Kustomize Secret - https://lnkd.in/gW_eugbf
27. Deploy Argo CD - https://lnkd.in/gHUMhS7Q
28. Install Helm for K8s - https://lnkd.in/gn2DHbRz
29. MongoDB - https://lnkd.in/ga8DmNKb
30. Hashicorp Vault - https://lnkd.in/gB7EZYJT


📱 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

#️⃣ Must-Know 📱 GitHub Interview Questions ❓

Brush up before your next DevOps/Cloud/Developer interview! 🖥⚙️

1. How does GitHub Actions work and how do you create a custom workflow?

2. What is the difference between git pull and git fetch in a GitHub repo context?

3. How can you resolve a merge conflict in GitHub?

4. Explain the concept of GitHub forks vs. branches.

5. How do you enforce protected branches and what is their purpose?

6. How can you trigger a GitHub Action only when code is pushed to a specific folder?

7. What is the .github directory used for in repositories?

8. How do you use GitHub CLI and what are its real-world benefits?

9. What is the difference between GitHub Projects and GitHub Issues?

10. How do you manage secrets in GitHub Actions securely?

11. What are GitHub Environments and how do they differ from branches?

12. How would you rollback a release deployed via GitHub Actions?

13. How do GitHub Codespaces help in faster development onboarding?

14. What’s the difference between squash merge, rebase, and regular merge on GitHub?

15. How do you set up branch rules for CI/CD pipelines using GitHub Actions?

🔠Hard level:

1. How do you handle secrets rotation dynamically in GitHub Actions without exposing credentials?

2. Explain how matrix builds work in GitHub Actions and when to use them.

3. How do you implement monorepo CI/CD with GitHub Actions while minimizing unnecessary job runs?

4. Describe a secure GitOps workflow using GitHub and ArgoCD.

5. How would you set up end-to-end testing across microservices using GitHub Actions workflows?

6. How do you audit GitHub enterprise repositories for compliance and security best practices?

7. What are the limitations of GitHub Actions compared to other CI/CD tools like GitLab or Jenkins?

8. How can you customize self-hosted GitHub Action runners and manage their scale?

9. Describe a real-world use case for composite actions and how you version them.

10. How do you prevent secret leakage during pull request builds in public GitHub repositories?

11. How can you manage cross-repo dependencies and coordinated releases using GitHub Workflows?

12. What’s the best way to handle rollback strategies in GitHub-based CD pipelines?

13. How do you integrate OPA/Gatekeeper or policy-as-code tools in GitHub Actions?

14. How can GitHub’s GraphQL API help in automating repo health checks and metrics?

15. How do you perform static code analysis + security scans (like SAST/Dependency Review) automatically on every PR?


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

🔝 20 DevOps and Cloud use cases

⚡️Here are 20 handpicked interesting ones.

1) AWS Architecture to Overcome API Gateway Pay Load Limit
🔠https://lnkd.in/gDzJiv3b

2) Kubernetes Pod Disruption Budget Practical Guide
🔠https://lnkd.in/gNZNxewk

3) How Provisioned Concurrency Cuts AWS Lambda Cold Starts by 98%
🔠https://lnkd.in/gkjzhEsv

4) How to Reduce Docker Image Size
🔠https://lnkd.in/gFzjeCXu

5) Multi Cloud GitOps Workflow for Kubernetes Management
🔠https://lnkd.in/gUGNMk2T

6) GitHub Actions Workflow for Terraform workspaces
🔠https://lnkd.in/gY4eQtwS

7) How To Convert Existing Cloud Infrastructure To Terraform
🔠https://lnkd.in/gSX6R7fK

8) Kubernetes Node Not Ready - How To Fix It
🔠https://lnkd.in/gksPqZYF

9) How One BigQuery Query Costs Shopify $1M a Month
🔠https://lnkd.in/gRRfYtXc

10) How AWS Handled 2024 Prime Day’s Record Breaking Traffic
🔠https://lnkd.in/g9RQ2fVc

11) Hidden Risk Of Relying On Labels In Kubernetes Security
🔠https://lnkd.in/gahmCwBB

12) Detecting and Mitigating Image Vulnerabilities with Docker Scout
🔠https://lnkd.in/gM4-wdCV

13) Security Researcher Exposed AWS Keys and API Secrets of $1B VC Firm in 5 Clicks
🔠https://lnkd.in/g_cmgR7D

14) Guide to a Well Structured Terraform Project
🔠https://lnkd.in/gZtsrsFu

15) Cloud Disaster Recovery Strategies
🔠https://lnkd.in/gTgjkNm9

16) Why should a container have only one process?
🔠https://lnkd.in/gKqD4GTf

17) AWS VPC Gateway Endpoints - The Most Underrated Cost Savers
🔠https://lnkd.in/g7-CUNfZ

18) The Problem With Overusing Terraform Dynamic Blocks
🔠https://lnkd.in/g7za-55Z

19) How Levels. fyi Cuts Cloud Bill By 15%
🔠https://lnkd.in/gVNwFnxB

20) Kubernetes Air Gap Implementation
🔠https://lnkd.in/gxxqWdEE


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

🚀 10 Advanced Terraform Interview Questions & Answers
🔧 For DevOps Engineers | Boost your Terraform game! 💥


Q1: Preventing accidental resource deletion?
✅ Use lifecycle { prevent_destroy = true }
✅ Run terraform plan before apply
✅ Implement strict access controls

Q2: Handling API rate limiting?
🔁 Use exponential backoff
🕒 Add time_sleep between ops
📦 Split deployments into smaller batches

Q3: Recovering from a corrupted state file?
🛠 Restore from backup
📥 Use terraform import
📂 Enable versioning on remote state storage

Q4: Backend migration?
📤 terraform state pull → update backend → terraform init -migrate-state
🛑 Schedule during maintenance with backups

Q5: Handling state drift in prod?
🔄 Regular terraform plan in CI/CD
⚠️ Automate drift detection + alerts
🔧 Reconcile with terraform import

Q6: Secrets management?
🔐 Use Vault / AWS Secrets Manager
👀 sensitive = true
🔒 Encrypt remote state at rest

Q7: Zero-downtime infra updates?
🧱 create_before_destroy
🟢 Blue-green deployments
📊 Gradual traffic shifting + health checks

Q8: Structuring modules for enterprise?
📦 Reusable modules with clear interfaces
📌 Version constraints
🔗 Remote state for dependency management

Q9: Large-scale refactoring strategy?
🔀 Use terraform state mv
🎯 Targeted applies
✅ Split into safe, tested PRs

Q10: Terraform testing best practices?
🧪 Static analysis: tflint, checkov
🧱 Unit tests: Terratest
🧹 Ephemeral envs with cleanup

💡 Save & Share to prep like a pro!
#Terraform #DevOps #InterviewReady #IaC


📱 Follow me on GitHub for more DevOps/Cloud Free Resources:
➡️ https://github.com/NotHarshhaa

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

✅ 𝗬𝗼𝘂 𝗱𝗼𝗻’𝘁 𝗻𝗲𝗲𝗱 𝘁𝗼 𝗹𝗲𝗮𝗿𝗻 𝗮𝗹𝗹 𝟮𝟬𝟬 𝗔𝗪𝗦 𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀.

Every cloud engineer starts out thinking they do.
Then they realise… the real secret is mastering the 𝑐𝑜𝑟𝑒 ones that power everything else.

Start small. Build strong. 🏆

✔️ Focus on:
EC2, Lambda, S3, RDS, VPC, IAM, CloudWatch

Once you understand how these connect, the rest of AWS suddenly makes sense.

You don’t need to know it all, just enough to build confidently.


📱 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

🐧 49 Linux Commands Every DevOps Engineer Should Have in Their Back Pocket


➡️System Intelligence:
• htop - Like top, but actually useful
• df -h - Because disk space issues find you
• netstat -tulpn - Your network's story
• lsof - What's using that port?
• ps aux | grep - Finding that runaway process
• dmesg - Kernel's gossip channel

➡️File Operations:
• find . -name - Your file search superhero
• tar -xvf - Unzip like a pro
• rsync - scp's smarter cousin
• sed -i - Stream editing wizard
• awk - Text manipulation magic
• grep -r - Find text like a detective

➡️Container Life:
• docker stats - Container vital signs
• docker logs -f - Live container stories
• crictl pods - Kubernetes container whisperer
• kubectl get pods - K8s status check

➡️Monitoring Magic:
• tail -f - Log watching party
• watch - Command on repeat
• vmstat - Memory tales
• iostat - Disk performance poetry

➡️Network Ninja:
• curl -v - HTTP storyteller
• nc - Network swiss army knife
• dig - DNS detective
• ss - Socket statistics

➡️Security Stuff:
• chmod - Permission painter
• chown - Ownership wizard
• openssl - Certificate craftsman
• ssh-keygen - Key creator

➡️Process Control:
• systemctl - Service sorcery
• journalctl - Log time machine
• kill -9 - Process terminator
• nice - Priority painter

➡️Performance Profiling:
• strace - System call spy
• tcpdump - Network packet poet
• sar - System activity reporter
• perf - Performance profiler

➡️Text Wrangling:
• cut -d - Column collector
• sort | uniq -c - Pattern finder
• tr - Character changer
• wc -l - Line counter

➡️File System:
• du -sh - Directory size detective
• fdisk -l - Disk detective
• mount - filesystem connector
• ln -s - Symlink sorcerer

➡️Shell Shortcuts:
• history | grep - Command time machine
• !! - Last command replay
• ctrl+r - Reverse search magic
• alias - Command shortcut creator

➡️Miscellaneous Mastery:
• tee - Output splitter
• xargs - Command multiplier
• at - Job scheduler
• screen/tmux - Terminal multiplexer


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

⚪ The simplest way to remember Kubernetes Networking

Break it into 4 layers

➡️ Layer 1 : understand CoreDNS and how it resolves service names and how it returns ClusterIP of the service

➡️ Layer 2 : understand how do you reach the service with kube-proxy and know how the traffic is routed from ClusterIP to backend pods

➡️ Layer 3 : time to understand how pods talk to each other with the help of CNI and how the networks bridges are getting formed

➡️ Layer 4 : how will the world connect to your service and understand how external access is provided with components like NodePorts, LBs and Ingress

Individually there are 4 kubernetes components that you need to learn and implement.

🟠 CoreDNS
🟠 kube-proxy
🟠 CNI Plugin
🟠 Ingress/ LB's


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

🛠 Essential AWS CLI Commands for DevOps Engineers 🛠


📌 Setup and Configuration:

# Install AWS CLI
pip install awscli

# Configure AWS CLI
aws configure

📌 IAM:

# List IAM users
aws iam list-users

# Create IAM user
aws iam create-user --user-name <username>

# Attach policy to IAM user
aws iam attach-user-policy --user-name <username> --policy-arn arn:aws:iam::aws:policy/<policy-name>

📌 EC2:

# List all EC2 instances
aws ec2 describe-instances

# Start an EC2 instance
aws ec2 start-instances --instance-ids <instance-id>

# Stop an EC2 instance
aws ec2 stop-instances --instance-ids <instance-id>

📌 S3:

# List all S3 buckets
aws s3 ls

# Upload file to S3 bucket
aws s3 cp <file-path> s3://<bucket-name>/<file-key>

# Download file from S3 bucket
aws s3 cp s3://<bucket-name>/<file-key> <file-path>

📌 RDS:

# List RDS instances
aws rds describe-db-instances

# Start RDS instance
aws rds start-db-instance --db-instance-identifier <instance-id>

# Stop RDS instance
aws rds stop-db-instance --db-instance-identifier <instance-id>

📌 CloudWatch:

# List CloudWatch log groups
aws logs describe-log-groups

# Create CloudWatch log group
aws logs create-log-group --log-group-name <log-group-name>

📌 Elastic Beanstalk:

# List Elastic Beanstalk environments
aws elasticbeanstalk describe-environments

# Update environment to new version
aws elasticbeanstalk update-environment --environment-name <env-name> --version-label <version-label>

📌 CloudFormation:

# List CloudFormation stacks
aws cloudformation describe-stacks

# Create CloudFormation stack
aws cloudformation create-stack --stack-name <stack-name> --template-body file://<template-file>

# Update CloudFormation stack
aws cloudformation update-stack --stack-name <stack-name> --template-body file://<template-file>

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

▶️ Docker interview Question for Freshers


1. What is Docker?
2. What are Docker containers?
3. How is Docker different from a virtual machine?
4. What is the purpose of Docker images?
5. What is Docker Hub?
6. How do you create a Docker container?
7. What is a Dockerfile, and how is it used?
8. What is the docker ps command?
9. How do you stop and remove a running Docker container?
10. What is the difference between docker run and docker exec?
11. How do you list all the Docker images on your system?
12. What is the docker-compose command used for?
13. How do you copy files from a Docker container to the host?
14. What is a Docker volume?
15. How do you map ports between your Docker container and host?
16. How do you attach to a running Docker container?
17. What is the Docker Compose file format version?
18. What is a Docker registry?
19. How do you view Docker container logs?
20. What is the docker network command?
21. What is Docker Desktop, and how does it differ from Docker Engine?
22. How do you view Docker container resource usage?
23. What is the purpose of the CMD instruction in a Dockerfile?
24. How do you pull an image from Docker Hub?
25. What is the ENTRYPOINT instruction in a Dockerfile?
26. How do you share data between Docker containers?
27. What is the .dockerignore file used for?
28. How do you create a Docker image from a Dockerfile?
29. What is the docker tag command, and how is it used?
30. How do you run a Docker container in the background (detached mode)?
31. What is the purpose of the EXPOSE instruction in a Dockerfile?
32. How do you remove all stopped containers in Docker?
33. How do you set environment variables for a running Docker container? 34. What is Docker Swarm?
35. How do you check the status of all containers running in Docker?
36. What is the difference between Docker’s COPY and ADD instructions in Dockerfile?
37. What is the docker system prune command?
38. What is the docker-compose up command used for?
39. How do you limit a container’s CPU and memory usage?
40. How do you add a volume to a Docker container?


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

🚀 From Docker to Kubernetes [v2.3.0] Release 🔥

Big new drop! We've added advanced topics and real-world strategies across Docker & Kubernetes to take your skills to the next level! 👨‍💻⚙️

🐳 Docker Section – Expanded!
➕ Added Docker Service Discovery DNS for advanced service discovery and DNS management
➕ Added Docker Observability Platforms for comprehensive monitoring and tracing solutions

☸️ Kubernetes Section – Leveled Up!
➕ Added Kubernetes Network Policies for sophisticated network security and access control
➕ Added Kubernetes Admission Controllers for advanced security and policy enforcement

📌 Dive in now & level up your DevOps journey!
🌐 https://dockertokubernetes.live

✉️ Read more about v2.3.0: https://www.dockertokubernetes.live/blog/v2-3


📱 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

⭐️ 𝘼𝙡𝙡 𝙞𝙣 𝙊𝙣𝙚 𝙗𝙪𝙙𝙙𝙡𝙚 𝙤𝙛 𝙆𝙪𝙗𝙚𝙧𝙣𝙚𝙩𝙚𝙨 ⭐️


📱 SOURCE LINK: https://github.com/NotHarshhaa/Kubernetes

🛑 This Repository includes:-

- Deployment manifest files
- Jenkins deployments & configurations
- Kubernetes Ingress files
- Realtime projects manifest files
- Helm charts for any application
- End to End Manifest files for any applications
- Includes AWS ELK Stack (Elasticsearch, Logstash, Kibana)
- Network service configurations templates
- Application monitoring templates for any applications
- Complete application launch manifest files for Realtime projects


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

🔜 80 % of DevOps candidates stumble on these 13 core topics in interviews. 🔙
Maybe you’re one of them.


Learn them - and you’ll stop being “just another DevOps engineer” and start sounding like someone who’s run real systems at scale.

➡️ 1. IaC Drift & State Management
- Terraform isn’t magic — state is.
- Pitfall: editing infra manually = drift, destroy failure, and team chaos.
- How to practice: terraform import a live resource, break it, run plan and explain the diff.

➡️ 2. CI/CD Pipelines
- Build, test, deploy — sounds easy until half your stages run on shared runners.
- Typical Q: “How do you ensure one bad pipeline doesn’t block all others?”
- How to practice: create a GitHub Actions matrix build with caching and concurrency control.

➡️ 3. Secrets Management
- Secrets don’t belong in Git repos - not even private ones. At least, use .env files
- Pitfall: Kubernetes Secrets are base64-encoded, not encrypted. Anyone with RBAC read access can see them.
How to practice:
- Enable envelope encryption with KMS in Kubernetes (encryptionConfiguration on API server) and Secrets Manager to store secrets combined with externalSecrets operator.
- Integrate Vault or SOPS for secret encryption/decryption.
- Rotate and revoke dynamically — don’t rely on static AWS keys.

➡️ 4. Kubernetes Networking
- If you can’t explain ClusterIP vs NodePort, you’re not ready.
- Interview Q: “Pod A can’t reach Pod B — how do you debug it?”
- How to practice: deploy a pod, run tcpdump, traceroute, and kubectl exec into it.

➡️ 5. Observability
- Logs tell stories, metrics tell trends, traces tell truth.
- Pitfall: no cardinality control = OOM Prometheus.
- How to practice: deploy Prometheus + Grafana, add custom app metrics, break something, alert on it.

➡️ 6. Scaling & Auto-Healing
- “It scales automatically” — until your pod keeps CrashLooping.
- How to practice: set HPA on CPU and memory, simulate load with hey, watch scaling curve.

➡️ 7. Networking & Load Balancing
- NGINX, Traefik, or ALB — same goals, different trade-offs.
- Pitfall: health checks that lie = half your cluster dark.
- How to practice: configure readiness vs liveness probes, misconfigure one, observe downtime.

➡️ 8. Disaster Recovery
- Backups don’t matter until restore works.
- Interview Q: “How would you test DR in prod?”
- How to practice: snapshot an RDS, delete data, restore to a clone, verify checksum parity.

➡️ 9. Immutable Infrastructure
- Snowflake servers kill consistency.
- Pitfall: patching live EC2s instead of redeploying AMIs.
- How to practice: bake AMIs with Packer, deploy via Terraform, tear down daily.

➡️ 10. Container Security

- root in Docker ≠ root on host — but it’s close enough to burn you.
- How to practice: run Trivy scan, fix CVEs, add non-root user to Dockerfile.

Pick one topic.
Run the drill.
Become the engineer people trust with production.
Repost this if you learned something new.

📱 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

❗️ Deloitte Interview Experience
🟣Position : DevOps Engineer

🟣𝗥𝗼𝘂𝗻𝗱 𝟭: 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗦𝗰𝗿𝗲𝗲𝗻𝗶𝗻𝗴
1. Explain the CI/CD workflow you follow and the kind of pipeline you use. How do you define and invoke pipelines in Jenkins?
2. What are shared libraries in Jenkins, and how are they written and defined?
3. What kind of applications do you deploy using Jenkins pipelines, and what deployment tools do you use?
4. If the Jenkins pipeline runs but the build doesn’t happen, what possible issues could be causing it?
5. What is the purpose of a webhook, and how is it used in a CI/CD pipeline?
6. How do you create and manage Kubernetes clusters (using tools like Terraform), and what are the master and worker nodes?
7. What are common Kubernetes errors you’ve faced (like CrashLoopBackOff, ImagePullError), and how did you resolve them?
8. What is the command to access a pod and how can you define or create a Kubernetes class or object?
9. Explain the folder structure of a basic Helm chart. What commands do you use to deploy with Helm?
10. What are the stages in a Docker image build? Why do we use ENTRYPOINT and CMD instructions?
11. How do you manage and connect services like DBs, EC2, EKS, or ECS? Include the command to connect to ECS.
12. Which container registry do you use for storing Docker images?

🟣𝗥𝗼𝘂𝗻𝗱 𝟮: 𝗜𝗻-𝗱𝗲𝗽𝘁𝗵 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗦𝗰𝗿𝗲𝗲𝗻𝗶𝗻𝗴
1. What branching strategy do you follow, and how do you handle merges to avoid breaking the release branch? If a bug appears in production, what’s your approach to resolving it?
2. Describe your typical deployment flow and CI/CD workflow. What stages do you define in your Jenkins pipeline, and how do you ensure full quality checks during deployment?
3. How do you use Jenkins shared libraries? Explain their typical structure and how they are integrated into your Jenkinsfiles.
4. Are you aware of security scanning tools? How do you scan Docker images—both during build and at the registry level? Are you using any extensions or tools for image scanning?
5. How do you pass environment variables during Docker build commands? What services do you use for storing Docker images?
6. How do you establish a connection with databases in your deployments or infrastructure setup?
7. How do you handle authentication for EKS clusters and store secrets securely in your environment?
8. How do you create AWS Lambda functions and manage the artifacts for deployment? What options do you use to push artifacts to Lambda?
9. What is email signing and Helm chart signing? Which tools do you use to sign Helm charts?

🟣𝗥𝗼𝘂𝗻𝗱 𝟯: 𝗛𝗠 𝗥𝗼𝘂𝗻𝗱 (𝗛𝗶𝗿𝗶𝗻𝗴 𝗠𝗮𝗻𝗮𝗴𝗲𝗿)
1. Project experiences.
2. Day-to-day responsibilities.
3. Light behavioral questions.
4. Teamwork & Culture Fit questions.


📱 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

💥 Deep Terraform Interview Questions — Beyond Basics 💥


If you’re preparing for Terraform Professional or DevOps interviews, these are some deep, practical questions you should master 👇

➡️ Terraform Core & State
How does Terraform manage implicit vs explicit dependencies?
What happens if the .tfstate file is lost or corrupted?
Why do we store state in S3 with DynamoDB locking?
Difference between terraform refresh, plan, and apply.

➡️ Modules & Reusability
How do you design Terraform modules for multi-region or multi-account setups?
Difference between count, for_each, and dynamic blocks.
How do you pass outputs between modules and environments?

➡️ Workspaces & Environments
When should you use Terraform workspaces?
What are better alternatives to workspaces in production?

➡️ Provisioners & Lifecycle
When to use local-exec and remote-exec?
Explain create_before_destroy, ignore_changes, and prevent_destroy.

➡️ Functions & Expressions
Real-world use of lookup(), merge(), cidrsubnet(), and coalesce().
Difference between count.index and each.key.

➡️ Commands Every Pro Should Know
terraform init -reconfigure
terraform plan -out=tfplan
terraform apply -auto-approve tfplan
terraform import aws_instance.myvm i-0abcd1234
terraform state mv / terraform state rm

➡️ Advanced DevOps Integrations
Terraform drift detection in CI/CD pipelines.
Securing variables with Vault / AWS Secrets Manager.
Policy-as-Code using Sentinel or OPA.

💬 Pro tip: Mastering Terraform is not about memorizing commands — it’s about understanding how Terraform tracks, plans, and reconciles real-world infrastructure state.


📱 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

📢 Kubernetes All End-to-End Content 2025

▶️ This Includes:
- All Kubernetes Content
- Kubernetes Realtime scenarios
- All Kubernetes Exercises with solutions
- No More AWS PDFs needed
- Easy to Learn from anywhere
- Detailed Explanation guide
- All Kubernetes Tricks & Techniques for DevOps guy
- Added Certified Kubernetes Administrator (CKA) Notes
- All Kubernetes Realtime examples included

📱 Link: https://github.com/NotHarshhaa/into-the-devops/tree/master/topics/kubernetes


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