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You installed a CNI plugin but pods cannot communicate across nodes. What is a likely cause?

medium📝 Troubleshoot Q14 of 15
Kubernetes - Networking
You installed a CNI plugin but pods cannot communicate across nodes. What is a likely cause?
ACNI config file missing or incorrect
BPods have no CPU limits set
CKubernetes API server is down
DNode disk space is full
Step-by-Step Solution
Solution:

  1. Step 1: Analyze pod network failure

    Pods not communicating across nodes usually means network setup is broken.

  2. Step 2: Check CNI config

    If the CNI config file is missing or wrong, networking won't work properly.

  3. Final Answer:

    CNI config file missing or incorrect -> Option A

  4. Quick Check:

    Network issues = CNI config problem [OK]
Quick Trick: Check CNI config file first for network issues [OK]
Common Mistakes:
  • Blaming CPU limits for network problems
  • Assuming API server affects pod networking directly
  • Ignoring CNI config correctness

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