Create documentation for Single Node Installer using Assisted Installer

[binnes]

Write up process for Single Node OKD (SNO) using self-hosted assisted installer

Reference guide : https://hackmd.io/tDnHM2BoQru0VgqMGI_Q5g
Linked discussion : okd-project/okd#1235

After the guide is created okd-project/planning#27 should take the content and create docs.okd.io content

[dovol]

Hello Binnes, can i ask if we will need an existing ocp cluster to use the method that you prescribe?

[binnes]

This method still needs to be investigated and documented on OKD.io. The reference guide uses podman to run a local instance of the assisted installer, so no additional cluster will be needed.

[GeoEducator]

investigating

[elmiko]

might be useful to have the OCP docs about this as well, https://docs.openshift.com/container-platform/4.11/installing/installing_sno/install-sno-installing-sno.html

[binnes]

I created a guide on running the assisted installer to deploy a single node OKD cluster, but I ran into issues and need help resolving.

Draft guide can be found here : https://github.com/brianinnes/okd.io/blob/main/docs/guides/sno-assisted-installer.md and there is a section at the end of the page detailing the issues

I added both FCOS and SCOS variants to the configuration and both fail for different reasons

SCOS fails quickly before the first reboot. There must be something different about the installer image based on SCOS which is breaking the assisted installer workflow @sherine-k, @LorbusChris are you able to provide any input here?

FCOS gets much further, but the cluster isn't healthy. The cluster operators do not complete. I have provided details and the must gather bundle - link in the draft guide. @luigizuccarelli, @elmiko can you help diagnose the cluster to see what is going wrong?

Additional information:

• target host is oVirt VM with 32 vCPU and 65535MB memory
• following the steps outlined in the guide against RedHat hosted Assisted Installer at https://console.redhat.com/openshift/assisted-installer/ to install OCP 4.12.10 SNO cluster works and creates a working cluster on the same oVirt host

[faermanj]

@binnes thanks for the guide, that's truly helpful! I'll give it a try and post back soon...

[binnes]

Waiting for openshift/installer#7112 to be completed