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  1. IL-0159 Docker Hub rate-limited Linode's IPv6 address space with 429 Too Many Requests, breaking image pulls for LKE and LKE-E clusters
    Linode2025
    Symptoms

    From about 21:38 UTC on 5 February 2025, image pulls from Docker Hub over IPv6 failed with 429 Too Many Requests errors across several Linode regions. Both unauthenticated and authenticated pull requests were refused.

    Image pull failures
    Trigger

    Docker Hub's abuse prevention measures started rate-limiting image pulls coming from Linode's IPv6 address space.

    Root cause
    Dependency failure
    Component
    Container registry and its credentialsVPC DNS resolver
    Contributing factor
    Unknown limit
    Detection

    The rate limiting began at about 21:38 UTC. The first status post, at 22:48 UTC, said Linode was aware of an issue with Docker Hub over IPv6 causing rate limiting and was investigating, and at 01:06 UTC on 6 February the status page said the issue had been identified as rate limiting of image pull requests to Docker Hub over IPv6.

    Remediation
    • changed the DNS resolvers to return an A record instead of an AAAA record so image pulls to Docker Hub used IPv4
    Action items
    • Find long-term solutions so that Docker Hub's abuse prevention measures do not affect Linode services
    Lessons

    A registry's abuse limit that groups IPv6 addresses by their first 64 bits can block a provider's whole address range at once, and authentication does not help. Answering DNS lookups with IPv4 addresses only was the quick way to move image pulls off the blocked range.

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This case involves Container registry and its credentials and VPC DNS resolver. 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

Dependency failure1 case

Component
Container registry and its credentialsVPC DNS resolver
Contributing factor
Unknown limit
Organisation
Linode
  1. IL-0159 Docker Hub rate-limited Linode's IPv6 address space with 429 Too Many Requests, breaking image pulls for LKE and LKE-E clusters
    Linode2025