Notes on DevSecOps, homelabs, security and the code in between, by Nikolaos Koulouridis (justNull).https://justnull.devenhttps://justnull.dev/blog/posts/building-a-vpn-kill-switch-that-fails-closedhttps://justnull.dev/blog/posts/building-a-vpn-kill-switch-that-fails-closedHow Umbra's Windows Filtering Platform kill switch blocks every leak, the day it locked me out of my own internet, and the fixes that followed.Tue, 29 Sep 2026 00:00:00 GMTNikos Koulouridishttps://justnull.dev/blog/posts/designing-a-database-migration-you-can-resumehttps://justnull.dev/blog/posts/designing-a-database-migration-you-can-resumeMoving production databases from SQL Server to Azure SQL as a resumable state machine: a write-stop gate, restartable steps and zero stored credentials.Tue, 29 Sep 2026 00:00:00 GMTNikos Koulouridishttps://justnull.dev/blog/posts/how-i-taught-myself-csshttps://justnull.dev/blog/posts/how-i-taught-myself-cssI learned CSS because my job needed it: fixing layouts, then refactoring monolithic themes. What made it click was the rules, and Firefox DevTools.Tue, 29 Sep 2026 00:00:00 GMTNikos Koulouridishttps://justnull.dev/blog/posts/patching-a-homelab-without-babysitting-ithttps://justnull.dev/blog/posts/patching-a-homelab-without-babysitting-itWhy I wrote a small updater for my Proxmox host and every LXC container: report by default, apply on demand, and never reboot on its own.Tue, 29 Sep 2026 00:00:00 GMTNikos Koulouridishttps://justnull.dev/blog/posts/moving-my-portfolio-to-gitlabhttps://justnull.dev/blog/posts/moving-my-portfolio-to-gitlabSwitching remotes, pushing over HTTPS with a personal access token that never touches .git/config, and skipping CI when you're short on pipeline minutes.Mon, 28 Sep 2026 00:00:00 GMTNikos Koulouridis