I had the pleasure of being a guest speaker at the March Go London User Group on the topic of container firewalls in Go.
The overarching idea is to prevent unwanted —accidental or malicious— contact between components, in our case containers, that should not be talking. Go is now a popular choice for network and protocol handling code.
Kubernetes Network Policy
Kubernetes supports an API for network policies that provides a sophisticated model for isolating applications and reducing their attack surface. However, it has been left up to third parties to implement these network policies. Weaveworks’ Network Policy Controller (weave-npc) is an implementation of the Kubernetes Network Policy, which specifies allowed connections within a Kubernetes cluster. The code is all written in Go, and available on GitHub under Apache Licence.
Check out the video to see my full presentation. I show you how Weave-npc is implemented, illustrating the Go APIs to read Kubernetes network policies, to create Linux netfilter rules, and to control Linux network interfaces.
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