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  • Entity Framework Schema Mismatch – Quick Pattern

    Entity Framework Schema Mismatch – Quick Pattern

    The Problem Model has fields → Database missing those fields → App crashes Detection (30 seconds) Fix Pattern (5 steps) 1. Fix the Snapshot Edit DBContextModelSnapshot.cs → Remove fields that don’t exist in real database 2. Create Migration 3. Review Migration Check the generated .cs file → Ensure it adds the missing fields 4. Apply…

  • Deploying a Hello World Web App on K3s Cluster on Proxmox

    Deploying a Hello World Web App on K3s Cluster on Proxmox

    This guide walks through deploying a simple nginx-based hello world application on a K3s cluster, using Traefik ingress for external access on standard HTTP port 80. Prerequisites Step 1: Create the Application Deployment Create a file called nginx-hello-deployment.yaml: Step 2: Create Service and Ingress Create nginx-hello-ingress.yaml: Step 3: Deploy the Application Step 4: Verify Deployment…

  • How to Restore a PostgreSQL Backup on OVH’s Managed Database (Without Superuser Access)

    OVH’s managed PostgreSQL hosting limits superuser operations like DROP SCHEMA, ALTER OWNER, GRANT, and REVOKE, making a standard backup restore fail. This article outlines a clean workaround using psql. Problem When restoring a backup with: You may hit errors like: Why? Because: ✅ Solution: Manual Table Cleanup + Clean Dump Restore 1. 🔽 Connect and…

  • Fix the “431 Request Header Fields Too Large” Error

    If you’ve ever encountered the frustrating 431 Request Header Fields Too Large error, you know how it can bring your web app or site to a halt. This error occurs when the HTTP request headers sent by your browser exceed the size limits that your server or reverse proxy allows. Headers often include cookies and…

  • Recover a Corrupt Google Cloud VM with Disk Space Issues Caused by Docker

    Google Cloud VMs can sometimes get stuck or become inaccessible due to disk space exhaustion — often from leftover Docker images, containers, and volumes accumulating after CI/CD pipelines. Here’s a clear, practical step-by-step guide to restore your VM and clean up Docker efficiently. Scenario Step 1: Create a Rescue VM and Attach the Corrupt Disk…

  • Why Some “Copycat” Companies Succeed Despite Competition

    Even with existing ideas, execution beats originality in many real-world cases. Here’s why they can succeed: 1. Better Execution 2. Better Timing 3. Focused Niche / Geography 4. Superior Distribution / Growth Engine 5. Brand Positioning or Pricing Why VCs Often Don’t Like “Copycat” Models They are playing a different game: 1. VCs Seek Asymmetric…

  • Automate Docker, Docker Compose and GitLab Runner deployment on Ubuntu