Update Operative System in cluster nodes RHEL8.9 to RHEL9.4

[smascorro]

Hello community, I have a managed cluster with 3 nodes running RHEL8.9, I removed a node to update the operating system to RHEL9.3, when I want to do the process of adding a node to the cluster it starts to show errors, my question is What is the best route to update the OS?

[DanielS]

Hello @smascorro Assuming you have spare hardware or virtual machine, I recommend that you add a 4th cluster node with RHEL version 9.4 and remove the next one to upgrade, always make sure you have at least 3 nodes at all times, this is not required but is recommended to avoid synchronization problems.

[smascorro]

I don't have a fourth machine due to resource issues, what I'm trying to do is seize a node, I updated the operating system from a new installation and what I'm trying to do is integrate it into the cluster already with the updated system, but I am having problems

[smascorro]

this is the image

[Esam_Eid]

install the nft with firewalld

also, check the other clusters installation directories and make sure to use the same standard. and try to create the nodekeeper manually