OpenShift SNO on Azure is booting to discovery ISO

Question

Hi Community,

I have Azure subscription and need to install OpenShift as Single node. I have manage this and the cluster was online and reachable using redhat console, however, after the restart of the cluster on Azure, VM booted again from the discovery ISO and therefore in the cluster events logs I can see logical error:

Failed to register host ........: Host is trying to register after the cluster has already been installed. That most probably means that the host is booting from the installation ISO, and therefore not effectively joining the cluster. The request will be ignored. Fix the boot order and reboot the host.

The VM was created from the converted discovery ISO to vhd and in Azure I can see the ISO disk as the OS disk and the sda (see table below) as the additional attached disk. I cannot see the sdb as the bootable installation.

The size of the VM is Standard D16s v3 (16 vcpus, 64 GiB memory).

I am strugling how to proceed and how to change the Boot order in Azure to boot from the installed OpenShift instead of ISO. The disk configuration from RedHat cluster dashboard looks as follwed:

3 Disk

Name	Role	Limitations		Drive type	Size	Serial	Model	WWN
sda	None			HDD	1.10 TB		Virtual_Disk
sda	None			HDD	1.10 TB		Virtual_Disk
sdb (bootable)	Installation disk			HDD	137.44 GB		Virtual_Disk
sdc (bootable)	None	1		HDD	1.10 TB

sdc is the installation ISO.

Could you please point me how to proceed with the discovery ISO removal?

I have tryied to swap the OS disk, but since I cannot see the installation, I cannot use the sdb. In addition, I cannot logon to the OpenShift while the Identities were not set yet and I was trying to move further via Azure, CLI/PS without success.

Thank you very much.