Incident Library
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  1. IL-0114 An unpinned AWS VPC CNI plugin was updated automatically during a capacity expansion, leaving new pods Pending without IP addresses and stopping CoW Protocol settlements for about 3.5 hours
    CoW Protocol2024
    Symptoms

    At 16:40 UTC on 19 April 2024 CoW Protocol's mainnet production environment stopped producing settlements; the outage officially began then.

    Pods PendingIP address exhaustionPod evictionService outage
    Trigger

    During a cluster capacity expansion, the Infrastructure as Code automation updated the AWS VPC CNI plugin, because the CNI version was not hardcoded in the IaC and the IaC library version had recently changed.

    Root cause
    Configuration change
    Component
    AWS VPC CNINode pool
    Contributing factor
    Unpinned versionOverlapping failures
    Detection

    The CNI version mismatch was identified as the cause at 17:03 UTC, 23 minutes after settlements stopped.

    Remediation
    • upgraded the Kubernetes cluster
    • set up new node groups with a new version of the networking plugin
    Lessons

    Versions in IaC scripts should be specified explicitly so an automation run cannot update a component such as the CNI plugin unintentionally. Changes in production need change management that is easy to revert.

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Check your cluster for this

This case involves Node pool and AWS VPC CNI. kubegap audits a Kubernetes cluster for gaps like these, read-only, from Claude Code or Codex; its checks cite public reports like the ones in this library.

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By root cause1

Configuration change1 case

Component
Node poolAWS VPC CNI
Contributing factor
Overlapping failuresUnpinned version
Organisation
CoW Protocol
  1. IL-0114 An unpinned AWS VPC CNI plugin was updated automatically during a capacity expansion, leaving new pods Pending without IP addresses and stopping CoW Protocol settlements for about 3.5 hours
    CoW Protocol2024