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Scenario #135
Networking
K8s v1.23, DigitalOcean Kubernetes

Intermittent Pod Connectivity Due to Network Plugin Bug

Pods experienced intermittent connectivity issues due to a bug in the CNI network plugin.

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What Happened

After a network plugin upgrade, some pods lost network connectivity intermittently, affecting communication with other services.

Diagnosis Steps
  • 1Checked CNI plugin logs and found errors related to pod IP assignment.
  • 2Rolled back the plugin version and tested connectivity, which resolved the issue.
Root Cause

Bug in the newly deployed version of the CNI plugin.

Fix/Workaround
• Rolled back the CNI plugin to the previous stable version.
• Reported the bug to the plugin maintainers for a fix.
Lessons Learned

Always test new plugin versions in a staging environment before upgrading in production.

How to Avoid
  • 1Use a canary deployment strategy for CNI plugin updates.
  • 2Monitor pod connectivity closely after updates.
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