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Asked: 2024-09-27T20:59:33+05:30 In:

I’m working with an Azure Kubernetes Service (AKS) that utilizes Calico for its network policy management, but I’m encountering an issue where the network policies I have set up do not seem to effectively restrict traffic as intended. Can someone help me understand why these policies are not blocking traffic as they’re supposed to?

I’m currently dealing with a pretty frustrating issue in my Azure Kubernetes Service (AKS) cluster where I’m using Calico to manage network policies, and honestly, it’s driving me a little nuts. I’ve gone through the trouble of setting up various network policies to restrict access between my services, but it seems like they’re not working as intended.

For example, I wanted to prevent certain pods from accessing others, but when I run some tests, I can still reach those services without any problem. I’ve double-checked the policies I created, and everything appears to be configured correctly. I’m using the right selectors and rules, but it feels like the policies are either being ignored or somehow not applied as I expected.

I’ve also looked into the Calico versions and the compatibility with AKS—everything seems to be in order there too. I ran a few `kubectl get networkpolicies` commands, and they show up just fine. But when I try to force a connection that should be blocked, my requests still go through like there are no policies in place.

I’m starting to wonder if it might be due to the order in which the policies are evaluated or if there are some default allow rules coming into play that I’m missing. Has anyone else run into this kind of issue? Is there something specific I might be missing in the YAML configurations for the network policies?

Also, any tips on debugging or validating network traffic in an AKS setup with Calico would be super helpful. I’ve tried looking at logs and monitoring tools, but I could really use some real-world advice on what to check next. I just want to feel confident that my network security is as tight as I thought it would be. Any insights or experiences would be greatly appreciated!

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    2 Answers

    1. Frustration with AKS and Calico Network Policies

      It sounds like you’re in a tough spot with your Azure Kubernetes Service and Calico stuff! Networking can be super tricky, especially when you think you’ve set everything up correctly but it just doesn’t work.

      Common Troubleshooting Steps

      • Check Policy Order: Yes, policies can be evaluated in a specific order, and sometimes an allow-all rule can sneak in. Make sure there’s no overlapping or conflicting rules!
      • Default Allow Policies: By default, Kubernetes allows traffic between pods unless you explicitly deny it. Double-check if there’s any `allow` policies that might be letting traffic through.
      • Correct Selectors: Ensure that the selectors on your policies are accurate. Sometimes a small typo can cause a big issue!
      • Policy Apply Status: You mentioned running `kubectl get networkpolicies`, but you could also check the actual applied state with something like `kubectl describe networkpolicy `, which may give you more insight.

      Debugging Tips

      For debugging, you can try:

      • Logs: Check the logs for both the Calico pods and the application pods. They might give you clues about what’s happening under the hood.
      • CNI Plugin Validation: Make sure that Calico is correctly installed as the CNI plugin, as sometimes misconfigurations can lead to issues.
      • Network Policy Status: Use `kubectl get pods –all-namespaces -o wide` to see which pods are in which nodes and verify network policies on the interfaces.
      • Calico Tools: If you have access to Calico tools (like Calicoctl), use them to get detailed diagnostics.

      Some Helpful Commands

      Commands that might help:


      kubectl get networkpolicies -A
      kubectl describe networkpolicy calicoctl get networkpolicy --k8s-package-version

      Wrap Up

      In the end, just don’t give up! Network policies are one of those things that require patience and lots of testing. Hopefully, you can tighten up your security soon. Keep pushing through, and you’ll get there!

    2. It sounds like you’re facing a common challenge with Calico network policies in your AKS cluster. One of the first things to verify is the order of policy evaluation, as Calico adheres to a “deny by default” rule, meaning that if no policies are matched, traffic is allowed. If any policy allows traffic, that could override your restrictions, resulting in unexpected access between your pods. Ensure that your policies are crafted to explicitly deny traffic from certain pods while allowing necessary communication for other services. Also, consider using the “egress” rules in conjunction with your “ingress” rules to ensure comprehensive traffic management.

      For debugging, you can utilize Calico’s troubleshooting tools like `calicoctl` and inspect the logs from your Calico components (Calico node, kubelet) to ensure that your policies are being recognized and applied as intended. Additionally, using `kubectl describe networkpolicy ` can provide further insights into how your policies are configured and whether they match your expectations. Pay attention to any default allow rules in the default namespace, as these can interfere with your specific policies. Finally, leverage Calico’s flow logs to analyze the actual traffic flow; this feature can help you confirm whether and when your policies are being enforced. With the right adjustments and tools, you should be able to tighten your network security in AKS effectively.

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