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One of the beauties of a thin hypervisor architecture like VMware ESXi is the fact that the entire state of the system can be described in a much more compact fashion than is possible with a general-purpose operating system.  This include areas such as: virtual networking configuration, storage settings, and host infrastructure services such as NTP and logging.  All changes to the system occur through well-defined APIs, so it's easy to know what can be modified.

This fact, among other things, makes it easy to back up the entire state of an ESXi host, in case you later need to restore the system to the same state.  The vCLI (vSphere Command Line Interface) has a command specially built for this purpose: vicfg-cfgbackup.  A recent blog posting on vmwaretips.com goes over a real-life situation where this command proved invaluable.:

A client had an ESXi host where the USB drive failed….. We needed to get this failed ESX host back online and quick!

You can read the rest of the story here.

About the Author

Charu Chaubal

Charu Chaubal is the Director of Technical Marketing for the Cloud Platform Business Unit at VMware, and runs the team that works on the vSphere product line. He has been at the company since 2006, and has been responsible for customer education and sales enablement for a wide range of datacenter technologies, such as hypervisor security, virtual networking, hyperconverged storage, and Big Data. Previously, he worked at Sun Microsystems, where he had over 7 years experience with architecting distributed resource management and HPC infrastructure software solutions.