Kubernetes Network Policy Deep Dive
Source: YouTube · Kubesimplify · published May 6, 2024 · 17:48
This video explains how to control traffic flow between Kubernetes pods using Network Policies, covering basic deny/allow rules and advanced Layer 7 filtering with Cilium 0:00.
Key Takeaways:
• By default, all pods can communicate across namespaces, but Network Policies allow control over inbound and outbound traffic to enforce security boundaries 0:33.
• A Network Policy with an empty pod selector applies to all pods in a namespace, and specific ingress rules can restrict traffic to particular ports or sources like a specific namespace 4:10.
• Standard Kubernetes policies operate at Layer 3 and 4, but managing Layer 7 HTTP traffic requires advanced solutions like Cilium or a service mesh 10:03.
• Cilium enables granular controls, such as creating cluster-wide policies that allow HTTP traffic to specific paths like /public while blocking others 12:30.
The video concludes that while Network Policies are native Kubernetes resources, their advanced capabilities like Layer 7 filtering depend on the underlying CNI implementation 16:08.
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First 800 characters of the transcript
let's say you are traveling from building a to Building B within a city and there are different roads that are getting connected from point A to point B now the traffic for you to go is open now if things have to be controlled then there might be traffic lights that put in there might be several routes that might be shut down due to different reasons for example it is military area or something like that so there has to be something put in place so that you should not take a particular Road to a particular place in a particular route similar to that in kubernetes every pod can talk to every other pod across Nam spaces now this is the default cuberes Behavior so what do you do in that particular case there is a concept called Network policies that you can use to prevent the ports from commu…