How do you troubleshoot CNI plugins when it fails?

When troubleshooting Container Network Interface (CNI) plugins in a Kubernetes environment, you can follow these steps to identify and resolve issues:

  1. Check CNI plugin logs: Each CNI plugin usually provides logs that can give insights into why it might be failing. Logs are often found in the `/var/log/` directory.
  2. Inspect Pod Events: Use `kubectl describe pod ` to check for any related events that could indicate why the pod's network setup failed.
  3. Verify CNI Configuration: Ensure that the CNI configuration files located in `/etc/cni/net.d/` are correctly set up and match the expected configuration for your cluster.
  4. Network Namespace Inspection: Use `ip netns` commands to check the network namespaces and see if the pod interfaces have been created properly.
  5. Test Network Connectivity: Use tools like `ping`, `curl`, or `tcpdump` within a pod to verify if it can communicate with other pods or external services.

Here is an example troubleshooting process:

// Example: Checking logs for a CNI plugin $ cni_logs = shell_exec('cat /var/log/cni.log'); echo $cni_logs;

CNI plugin troubleshooting Kubernetes networking issues CNI logs container networking DevOps

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