fail to create vSphere 4.12.2 IPI cluster as apiVIP and ingressVIP are not in machine networks

# ./openshift-install create cluster --dir=/tmp
? SSH Public Key /root/.ssh/id_rsa.pub
? Platform vsphere
? vCenter vcenter.vmware.gsslab.pnq2.redhat.com
? Username administrator@gsslab.pnq
? Password [? for help] ************
INFO Connecting to vCenter vcenter.vmware.gsslab.pnq2.redhat.com
INFO Defaulting to only available datacenter: OpenShift-DC
INFO Defaulting to only available cluster: OCP
? Default Datastore OCP-PNQ-Datastore
? Network PNQ2-25G-PUBLIC-PG
? Virtual IP Address for API [? for help] 192.168.1.10
X Sorry, your reply was invalid: IP expected to be in one of the machine networks: 10.0.0.0/16
? Virtual IP Address for API [? for help]


As the user could not define cidr for machineNetwork when creating the cluster or install-config file interactively, it will use default value 10.0.0.0/16, so fail to create the cluster ot install-config when inputting apiVIP and ingressVIP outside of default machinenNetwork.

Error is thrown from https://github.com/openshift/installer/blob/master/pkg/types/validation/installconfig.go#L655-L666, seems new function introduced from PR https://github.com/openshift/installer/pull/5798

The issue should also impact Nutanix platform.

I don't understand why the installer is expecting/validating VIPs from 10.0.0.0/16 machine network by default when it's not evening asking to input the machine networks during the survey. This validation was not mandatory in previous OCP installers.


 

# ./openshift-install version
./openshift-install 4.12.2
built from commit 7fea1c4fc00312fdf91df361b4ec1a1a12288a97
release image quay.io/openshift-release-dev/ocp-release@sha256:31c7741fc7bb73ff752ba43f5acf014b8fadd69196fc522241302de918066cb1
release architecture amd64

Always

1. create install-config.yaml file by running command "./openshift-install create install-config --dir ipi"
2. failed with above error

fail to create install-config.yaml file

succeed to create install-config.yaml file

 The current workaround is to use dummy VIPs from 10.0.0.0/16 machinenetwork to create the install-config first and then modify the machinenetwork and VIPs as per your requirement which is overhead and creates a negative experience.


There was already a bug reported which seems to have only fixed the VIP validation: https://issues.redhat.com/browse/OCPBUGS-881