Azure redhat Openshift

Question

What is the OS used in ARO ?
Cluster VM counts and role of the VMs ?
Will there be red hat support or Azure will support for the Openshift OS ?

Answer 1

1. Red Hat OpenShift includes an enterprise-grade Linux operating system, container runtime, networking, monitoring, registry, and authentication and authorization solutions. Red Hat Enterprise Linux CoreOS (RHCOS) upgrades in Red Hat OpenShift Container Platform are performed during cluster updates.
2. Can you please elaborate on this point to help me understand better? This doc may be helpful: https://www.openshift.com/blog/containers-and-virtual-machines-together-on-red-hat-openshift-platform
3. If your ARO cluster is running an OpenShift version that is not on the supported versions list or is using an unsupported cluster configuration, your cluster is "outside of support". As a result:

-When opening a support ticket for your cluster, you will be asked to upgrade the cluster to a supported version before receiving support, unless you are within the 30-day grace period after version support ends.
-Any runtime or SLA guarantees for clusters outside of the support are voided.
-Clusters outside of support will be patched only on a best effort basis.
-Clusters outside of support will not be monitored.

You can find more details about the support here:

1. https://learn.microsoft.com/en-us/azure/openshift/support-lifecycle
2. https://learn.microsoft.com/en-us/azure/openshift/support-policies-v4