Kubernetes Networking: How to Write a CNI Plugin From Scratch
summary
Bash CNI plugin implements ADD/DEL, creates a bridge + veth pair, moves one end into the pod netns, assigns IPs by incrementing a file, and sets iface up with ip and iproute2; demo runs on two nodes with per-node pod CIDRs and shows pods get addresses (.4/.5) but need explicit iptables FORWARD and MASQUERADE plus static inter-node routes to reach other nodes; no long‑running daemon is provided so node-level rules are applied manually and connectivity works after those changes.
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chapters (7)
- 0:00Start
- 1:24What is CNI?
- 4:10What a CNI plugin is made of?
- 6:05The weave example..
- 8:25How a CNI plugin is being used in K8s?
- 10:11How a CNI plugin is executed?
- 11:43Anatomy of pod networking
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