Vester is a community project that aims to provide an extremely light-weight approach to vSphere configuration management using Pester and PowerCLI. The end-state configuration for each vSphere component, such as clusters and hosts, are abstracted into a simple config file. The configuration is tested--and optionally remediated--when drift is identified. The entire project is written in PowerShell.
March 2017: To learn how to use Vester 1.0, there is a three-part blog series and accompanying video demo. (Which is really long. You've been warned.)
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