Research and develop method to scale up an existing cluster

[akrzos]

One of the desired features of Jetlag would be the ability to scale up a cluster after an initial cluster is installed. We need to research scale up methods for assisted-installer based cluster, and determine if these are feasible via a playbook to make this a simple task.

[afcollins]

A new feature GA'd in 4.17 that could be an implementation here https://docs.openshift.com/container-platform/4.17/nodes/nodes/nodes-nodes-adding-node-iso.html

Going through the docs initially, the generate-discovery-iso and boot-iso jetlag tasks already accomplish the steps required to add nodes through this method and already includes a httpd server to host the iso.

[radez]

I've been working on this using this doc as a template for workflow: https://access.redhat.com/solutions/6968529

[afcollins]

Oh! Ok.

That makes sense for versions less than 4.17 where this feature was added.

Maybe we look to use this new approach for 4.17 and onward?