Podman is only used for bootstrapping the cluster with the OpenShift installer. The cluster itself uses cri-o.
Re:Podman 4.0
by spicyusername on Tuesday February 22, 2022 @06:55PM
(#30435581)
OpenShift uses cri-o as the runtime.
I know rancher requires Docker and is not compatible with Podman as of today.
And I believe Red Hat uses Podman in Openshift, their implementation of kubernetes.