Arun Kumar

I don’t stop until I achieve the goal.

[Arun Kumar @iamarunkumar27]

@BansalHashi Let's connect

[Arun Kumar @iamarunkumar27]

@Cynthia_qn I'm in the middle 😂

[Arun Kumar @iamarunkumar27]

@Shrii_6 🎉

[Arun Kumar @iamarunkumar27]

@reshuu_ka Practice practice practice practice... 😢

[Arun Kumar @iamarunkumar27]

CODESPACE - Day 2 ✅

Today , I continued working on my project and explored how to manage sandbox environments using Kubernetes.

Today's progress:

• Kubernetes RBAC : Configured a ServiceAccount, Role, and RoleBinding to manage access to Kubernetes resources.

• Dynamic Pod Creation : Worked on creating sandbox Pods programmatically using the Kubernetes Node.js client.

• Service Management : Implemented dynamic ClusterIP Service creation to expose individual sandbox environments internally.

• Reverse Proxy : Set up proxy middleware using Express.js to route requests to the appropriate sandbox.

• Health Checks : Added liveness and readiness endpoints to monitor service health.

• Docker : Configure container images using Node.js Alpine and set up the development environment.

• Resource Management : Defined CPU and memory requests and limits for sandbox containers.

• Key learning : How backend code can interact with the Kubernetes API to create resources dynamically and route requests between services.

Still learning, building, and improving one step at a time.

#Kubernetes #Docker #NodeJS #Microservices #DevOps #BackendDevelopment #BuildInPublic

@sheryians_ @ankurdotio
@harshvsharmaa

[Arun Kumar @iamarunkumar27]

@k_shis24 Something completely expected

[Arun Kumar @iamarunkumar27]

CODESPACE - Day 1 ✅

• Project Setup & Containerized Backend.

Today, I started building my new project CODESPACE.

What I worked on today :

• Initialized the CODESPACE project and started structuring the backend architecture.

• Containerized the Sandbox backend using Docker.

• Configured the Docker image with Node.js 20 Alpine for a lightweight runtime.

• Set up the Dockerfile with dependency installation and application startup.

• Created an Express.js server running on port 3000.

• Started integrating Kubernetes for container orchestration.

• Created a Kubernetes Deployment for the Sandbox application.

• Configured replicas and pod selectors for managing application instances.

• Added Kubernetes resource requests and limits for CPU and memory.

• Configured a liveness probe for container health monitoring.

• Created a Kubernetes ClusterIP Service to expose the application internally.

• Configured NGINX Ingress for routing /api/sandbox requests to the Sandbox service.

• Connected the flow: Client → Ingress → Service → Pod → Express Server.

• Learned more about how Docker, Kubernetes, Services, and Ingress work together in a real application.

Today's focus :
Containerization → Deployment → Networking → Routing → Health Checks

#Docker #Kubernetes #NodeJS #ExpressJS #DevOps #BackendDevelopment #SoftwareDevelopment #BuildInPublic

@sheryians_ @ankurdotio
@harshvsharmaa

[Arun Kumar @iamarunkumar27]

@EdenBitton7 @X Sure

[Arun Kumar @iamarunkumar27]

👋 Hey @X, I’m looking to connect with people across the tech community.

I’m currently learning, building, and growing in tech, and I’d love to connect with people from different fields:

💻 Software Development
🤖 AI / ML
☁️ Cloud & DevOps
🔐 Cybersecurity
🎨 UI/UX
🚀 Startups & Product
🧠 DSA & Competitive Programming

Whether you’re a student, fresher, developer, engineer, or experienced professional , let’s connect, exchange knowledge, share our journeys, and grow together. 🤝

If you’re building something or learning something new, drop a “Hi” and let’s connect! 👇

#TechTwitter #BuildInPublic #Developers #SoftwareEngineering #WebDevelopment #AI #DevOps #CloudComputing #UIDesign #Startups #DSA #Coding

[Arun Kumar @iamarunkumar27]

@TheXSami Thanks

[Arun Kumar @iamarunkumar27]

@vlasyuk_a @X Thank u

[Arun Kumar @iamarunkumar27]

@theartofzekeri @X Sure

[Arun Kumar @iamarunkumar27]

@i_mika_el @X That’s a fair point! 😄 I want to connect with people across tech initially, but I’ll definitely try more niche-specific posts going forward. Thanks for the suggestion! 🙌”

[Arun Kumar @iamarunkumar27]

@benabmathew @X Sure !

[Arun Kumar @iamarunkumar27]

@0xluqman @X 🤝

[Arun Kumar @iamarunkumar27]

Today, I went a step deeper into Kubernetes and worked on deploying, managing and debugging an application.

• Docker + Kubernetes : Built the backend Docker image and used Kubernetes YAML files to deploy the application.

• Deployment with kubectl : Applied Deployment, Service and Ingress configurations using kubectl.

• Monitoring Resources : Used commands like kubectl get pods, kubectl get services and kubectl get ingress to verify everything.

• Application Access : Learned how to access the application through Ingress, host configuration and NodePort.

• Updating the App : Understood how to rebuild the Docker image and restart the Deployment after changes.

• Debugging : Explored errors like ImagePullBackOff, CrashLoopBackOff, 503, 404, Pending Pods and ECONNREFUSED.

• HPA : Learned how Kubernetes can automatically scale pods based on CPU usage using metrics-server.

• Secrets : Learned how to manage sensitive data like passwords, API keys and JWT secrets, and understood that Base64 is encoding, not encryption.

• Hey CLI : Installed and explored Hey CLI as part of the development workflow.

• Watch CLI : Explored Watch CLI to continuously monitor command output and observe changes in real time.

💡 Biggest takeaway:

Today Kubernetes felt much more practical - from deployment and networking to debugging, monitoring and autoscaling.

Docker → Kubernetes → Deploy → Access → Debug → Monitor → Scale 🔥
#Kubernetes #Docker #DevOps #BuildInPublic #LearningJourney

@sheryians_ @harshvsharmaa

[Arun Kumar @iamarunkumar27]

Day 1 - Revision Journey ✅ .

Started my Day 1 of revision by revisiting my Web Development fundamentals.

🌐 Internet Basics :

• Web 1.0 → Static websites.

• Web 2.0 → User interaction & content sharing.

• Web 3.0 → Decentralization
IP Address, DNS, ISP, Routers & Data Packets.

🖥️ Client-Server Architecture :

• Client sends a request.

• Server processes the request.

• Server sends back a response.

• Revised Frontend vs Backend.

• Static vs Dynamic websites.

🔗 Internet Protocols

• TCP → Reliable & ordered data delivery.

• UDP → Faster communication
TCP 3-Way Handshake.

• SYN → SYN-ACK → ACK 3.

🔐 HTTP & HTTPS :

• Revised HTTP/1.0, HTTP/1.1, HTTP/2 & HTTP/3.

• Status codes: 2xx, 3xx, 4xx, 5xx.

• HTTPS with SSL/TLS encryption
Authentication, encryption & data integrity.

🧑‍💻 Git & Version Control :

• Repository, Working Directory & Staging Area.

• Commits & Branches.

• Remote Repository.

• Commands: git init, git add, git commit, git status, git push, git pull.

🏗️ HTML Fundamentals :

• HTML structure & boilerplate
Headings, paragraphs & formatting.

• Lists, links & images
alt, viewport, accessibility & SEO basics.

🎨 CSS Fundamentals :

• Inline, Internal & External CSS
Universal, Tag, Class & ID selectors.

• Colors, fonts & text properties
Selector → Property → Value.

Revising → Understanding → Strengthening the fundamentals. 🚀

#WebDevelopment #LearningInPublic

@sheryians_ @sarthacksharma
@harshvsharmaa @Stwkraj

[Arun Kumar @iamarunkumar27]

@mansijournalss Seriously 😳

[Arun Kumar @iamarunkumar27]

@payalpixel 😂