Cluster Autoscaler not balancing nodes across Availability Zones in OpenShift 4

Solution Verified - Updated -


  • Having 2 Availability Zones, such as west-1a and west-1b, the MachineAutoScaler is configured for MachineSets of both the zones. But the Cluster Autoscaler does not provision worker nodes evenly across both the MachineSets.
  • Nodes scaled up unevenly across Availability Zones when using Cluster Autoscaler in OpenShift 4.
  • Is it possible to use the balanceSimilarNodeGroups option in the Cluster Autoscaler in OpenShift 4?


  • Red Hat OpenShift Container Platform (RHOCP)
    • 4
  • Red Hat OpenShift Service on AWS (ROSA)
    • 4
  • Red Hat OpenShift Dedicated (OSD)
    • 4
  • Cluster Autoscaler

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