kubernetes configuration_error ai_generated true

ConfigMap exceeds maximum size: the ConfigMap is too large, maximum size is 1048576 bytes

ID: kubernetes/k8s-configmap-too-large

Also available as: JSON · Markdown
88%Fix Rate
90%Confidence
50Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
8 active — — —

Root Cause

ConfigMap data exceeds the 1MB etcd object size limit. Data must be reduced or moved to an alternative storage mechanism.

generic

Workarounds

  1. 92% success Move large data to a PersistentVolume or init container that downloads from object storage 
    Use an initContainer to fetch config from S3/GCS, or mount a PVC with the config files

    Sources: https://kubernetes.io/docs/concepts/storage/persistent-volumes/

  2. 85% success Split the ConfigMap into multiple smaller ConfigMaps, each under 1MB 
    Divide data keys across ConfigMaps and mount each as a separate volume

    Sources: https://kubernetes.io/docs/concepts/configuration/configmap/

Dead Ends

Common approaches that don't work:

  1. Increase the etcd max-request-bytes value 75% fail

    Requires cluster admin access, risks etcd stability, and most managed K8s providers don't allow it

  2. Base64-encode the data to reduce size 95% fail

    Base64 actually increases data size by ~33%, making the problem worse

Error Chain

Leads to:
Preceded by:
Frequently confused with: