While attempting to complete an OCP install on LinuxOne KVM, I noticed that when specifying 0 worker replicas in the install-config.yaml, the mastersSchedulable value is always true when creating manifests. The documentation specifies that this value should be false except in the case of a 3 node cluster. If I specify worker replicas, the mastersSchedulable parameter is false as required. The documentation also specifies that in the case of user provisioned infrastructure, the number of worker replicas should be 0. To me this seems counter-intuitive to never have the mastersSchedulable value end up as false when that is required in all cases besides a three-node cluster.

    4.15.X

    Very reproducible

    1. Obtain openshift-install binary for s390x
    2. Create a valid install-config.yaml file with the worker replicas parm set to 0 as specified for user-provisioned infrastructure
    3. Run ./openshift-install create manifests --dir <dirWithInstallConfig>

    Inspect manifests/cluster-scheduler-02-config.yml and see that mastersSchedulable is true

    Inspect manifests/cluster-scheduler-02-config.yml and see that mastersSchedulable is false