Tech Fusionist (Tech : Cloud, DevOps, Cybersecurity, AI & more)

Deploying Pods is one skill. Understanding Kubernetes networking in production takes these 15. 👇 𝐊𝐮𝐛𝐞𝐫𝐧𝐞𝐭𝐞𝐬 𝐍𝐞𝐭𝐰𝐨𝐫𝐤𝐢𝐧𝐠: 𝟏𝟓 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐒𝐤𝐢𝐥𝐥𝐬 𝐁𝐞𝐲𝐨𝐧𝐝 𝐁𝐚𝐬𝐢𝐜 𝐂𝐍𝐈 1. 𝐂𝐍𝐈 & 𝐈𝐏𝐀𝐌 Understand how Pods receive interfaces, IP addresses, and routes. Diagnose IP exhaustion and failed network setup. 2. 𝐏𝐨𝐝-𝐭𝐨-𝐏𝐨𝐝 𝐑𝐨𝐮𝐭𝐢𝐧𝐠 Trace same-node and cross-node traffic. Know whether your cluster uses an overlay or directly routed Pod IPs. 3. 𝐎𝐕𝐍 Understand logical switches, routers, ACLs, and load balancers in clusters using OVN. 4. 𝐎𝐩𝐞𝐧 𝐯𝐒𝐰𝐢𝐭𝐜𝐡 (𝐎𝐕𝐒) Inspect bridges, ports, tunnels, and flows. Connect OVN’s logical configuration to actual packet forwarding. 5. 𝐕𝐏𝐂 𝐑𝐨𝐮𝐭𝐢𝐧𝐠 Map Pod CIDRs, node subnets, route tables, and cloud firewalls. Always verify the return path. 6. 𝐒𝐞𝐫𝐯𝐢𝐜𝐞 𝐕𝐈𝐏𝐬 Understand how a ClusterIP reaches backend Pods. Identify which component implements Service forwarding in your cluster. 7. 𝐒𝐞𝐫𝐯𝐢𝐜𝐞 𝐋𝐨𝐚𝐝 𝐁𝐚𝐥𝐚𝐧𝐜𝐢𝐧𝐠 Learn your actual dataplane: kube-proxy or a CNI-provided implementation. Troubleshoot backend selection and connection persistence. 8. 𝐄𝐧𝐝𝐩𝐨𝐢𝐧𝐭𝐒𝐥𝐢𝐜𝐞𝐬 Check backend IPs, ports, and readiness conditions. A Service can exist while having no eligible backends. 9. 𝐒𝐍𝐀𝐓 Understand when source addresses change. Track the IP external systems actually see. 10. 𝐃𝐍𝐀𝐓 Trace destination translation from a Service address to a backend. Verify 𝚙𝚘𝚛𝚝, 𝚝𝚊𝚛𝚐𝚎𝚝𝙿𝚘𝚛𝚝, and application listeners. 11. 𝐄𝐠𝐫𝐞𝐬𝐬 𝐆𝐚𝐭𝐞𝐰𝐚𝐲𝐬 Use implementation-specific egress controls for predictable outbound IPs. Test failover, routing, and external allowlists. 12. 𝐍𝐞𝐭𝐰𝐨𝐫𝐤 𝐏𝐨𝐥𝐢𝐜𝐢𝐞𝐬 Start with default deny, then allow required traffic. Check both source egress and destination ingress, including DNS. 13. 𝐄𝐱𝐭𝐞𝐫𝐧𝐚𝐥 𝐓𝐫𝐚𝐟𝐟𝐢𝐜 & 𝐒𝐨𝐮𝐫𝐜𝐞 𝐈𝐏 Understand LoadBalancer, NodePort, and 𝚎𝚡𝚝𝚎𝚛𝚗𝚊𝚕𝚃𝚛𝚊𝚏𝚏𝚒𝚌𝙿𝚘𝚕𝚒𝚌𝚢. Test source-IP preservation and nodes without local backends. 14. 𝐃𝐍𝐒 & 𝐌𝐓𝐔 Debug name resolution separately from connectivity. Check tunnel overhead when small requests work but larger transfers stall. 15. 𝐏𝐚𝐜𝐤𝐞𝐭-𝐋𝐞𝐯𝐞𝐥 𝐓𝐫𝐨𝐮𝐛𝐥𝐞𝐬𝐡𝐨𝐨𝐭𝐢𝐧𝐠 Combine 𝚝𝚌𝚙𝚍𝚞𝚖𝚙, route inspection, conntrack, and dataplane tools. Find exactly where packets disappear. Practice tracing two paths: Pod → Service → backend Pod Pod → egress path → external API → return path Bookmark this for your next networking incident or platform engineering interview. 🔖

29 visual guides to build your Cloud, DevOps & AI skills. 🚀 Bookmark this list for your next learning session. 🔖 1. Cloud Security Visual Guide https://t3pacademy.gumroad.com/l/bhqrnr 2. Build AI Agents & Workflow Automation https://t3pacademy.gumroad.com/l/jqzkka 3. DevOps Hiring Checklist https://t3pacademy.gumroad.com/l/qypmfg 4. Cloud Landing Zone Visual Handbook https://t3pacademy.gumroad.com/l/tgymw 5. DevOps Roadmap https://t3pacademy.gumroad.com/l/vnpzx 6. Linux Mastery: 53 Advanced Commands https://t3pacademy.gumroad.com/l/nqvze 7. GitHub Actions Visual Guide https://t3pacademy.gumroad.com/l/yrmqtc 8. AWS Containers Mastery https://t3pacademy.gumroad.com/l/orehcl 9. System Design Visual Guide https://t3pacademy.gumroad.com/l/utavs 10. Disaster Recovery Visual Blueprint https://t3pacademy.gumroad.com/l/DR-visual-guide 11. Terraform Troubleshooting Guide https://t3pacademy.gumroad.com/l/Terraform-Troubleshooting-Guide-v1 12. AWS Container & Serverless Troubleshooting https://t3pacademy.gumroad.com/l/AWS-Container-Serverless-Troubleshooting-Guide 13. AWS Cloud Security Cheat Sheet https://t3pacademy.gumroad.com/l/aws-cloud-security-cheat-sheet 14. AWS + Terraform Deployment Guide https://t3pacademy.gumroad.com/l/aws_terraform_step_by_step_deployment_guide 15. Linux Interview Handbook https://t3pacademy.gumroad.com/l/ogmtue 16. AI Engineer Roadmap https://t3pacademy.gumroad.com/l/AI-Engineer-Roadmap 17. AI Cheat Sheet for Beginners https://t3pacademy.gumroad.com/l/ai-cheat-sheet-for-beginners 18. AI Agent Builder’s Handbook https://t3pacademy.gumroad.com/l/mtuvw 19. Generative AI Basics https://t3pacademy.gumroad.com/l/GenAI-Basics-v1 20. MLOps for Beginners https://t3pacademy.gumroad.com/l/uwjlt 21. AI Infrastructure Playbook https://t3pacademy.gumroad.com/l/xshyux 22. Docker 8-Days Visual Guide https://t3pacademy.gumroad.com/l/docker-8days-visual-guide-v1 23. Kubernetes Production Readiness: 100 Checks Before You Go Live https://t3pacademy.gumroad.com/l/yqorlm 24. From Cloud & DevOps to AI Engineer: The Career Transition Visual Playbook https://t3pacademy.gumroad.com/l/Cloud-DevOps-to-AI-Engineer-v1 25. LLM Inference: A Quick Visual Guide https://t3pacademy.gumroad.com/l/LLMs-visual-guide-v1 26. 12-Day Docker Mastery: Beginner to Production Visual Guide https://t3pacademy.gumroad.com/l/ghwtbt 27. AI Observability & Evaluation Visual Playbook https://t3pacademy.gumroad.com/l/AI-Oberservability-and-Evaluation-visual-playbook-v1 28. MCP + A2A Visual Playbook https://t3pacademy.gumroad.com/l/MCP_A2A_Visual_Playbook 29. DevOps CI/CD Mastery: 10 Steps to Build a Production-Ready Pipeline https://t3pacademy.gumroad.com/l/CI-CD-10steps-to-build-pipeline-v1 Pick one guide. Learn a concept. Put it into practice. All guides: https://t3pacademy.gumroad.com/ ~Tech Fusionist

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