In this chapter, we learned about the importance of keeping Proxmox nodes up to date in a cluster and how to properly update and upgrade a node through both the GUI and CLI. We also covered when to reboot or not reboot a node after an upgrade.

In the next chapter, we are going to learn how to troubleshoot a Proxmox cluster when various issues arise. These issues have been taken from real-world Proxmox clusters serving live users.