This is just a space for me to share some notes and thoughts. I hope someone finds something useful here. Zola 2025-11-02T00:00:00+00:00 https://suchaboris.com/tags/debugging/atom.xml 2025-11-02T00:00:00+00:00 2025-11-02T00:00:00+00:00 Unknown https://suchaboris.com/blog/debugging-k8s-network-policies/ <p>My focus last week (in personal projects space) was to add network policies to my <strong>homelab</strong>. I added them to all custom namespaces but, in the end, had to revert some and replace them with less restrictive ones because some things just stopped working, and I had no time to investigate why.</p> <p>The biggest challenge was in the very beginning when none of the policies I added did anything. Everything looked good in the logs and on the <strong>K8s</strong> cluster. I mean, there were no errors or reports of invalid configs.</p> <p>After several hours of cumulative debugging, checking all configs, and brainstorming with AI, I found that my nodes just didn't have the <strong>iptables</strong> binary! 🤦</p> <p>Everything looked great in the logs, but no rules were enforced. After adding the binary and updating my bootstrap scripts, all the rules started working as intended.</p>