Cloud server diagnostics

How to boot a cloud server in Rescue and troubleshooting mode and connect to it

How to restore a server from an ISO image

How to change and recover a cloud server password in Rescue recovery and diagnostics mode

How to test cloud server disk performance using the fio utility

How to switch network configuration from ifupdown to netplan on cloud servers created from pre-built images with Ubuntu 18.04, 20.04, and 22.04