You may encountered that intalled Openshift stable-4.18 either through assisted install method your own cli agent method – openshift worked well until the first restart. Regardless you gracefully restart or accuidentally, the current Openshift SNO not starting up, not giving console access as well, no oc or kubectl remote methdos.

I have shared on github howto resolve such basic openshift sno issue:

https://github.com/mazsola2k/openshift/wiki/Fix-Openshift-SNO-startup-problem