I’ll admit I haven’t had to install APC’s PowerChute Network Shutdown product on my ESX(i) hosts lately, as the kind of DCs I’m hosting stuff in doesn’t cater for the UPS in a rack scenario. That said, I’ve had the (mis)fortune to have to install and configure this software in years gone by. As luck would have it, VMware published a KB article recently that points to APC’s support website for information on the how and what. There are two PDF files on the APC support page – one for ESX and one for ESXi. So, if you’re into that kind of thing, then you should find this useful.