OpenShift 4.3.x Private Cluster installation fails on an existing AWS VPC having multiple CIDR

Solution Verified - Updated -


  • IPI based installation fails if VPC contains more than one CIDR.
  • After providing the required machineCIDR in install-config out of the available VPC CIDR, the installation fails.
  • The installation uses the main VPC CIDR even after specifying the other available CIDR in machineCIDR of install-config.


  • Red Hat OpenShift Container Platform (OCP)
    • 4.3.x

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