The ESX 4.0 Server is VMware's customised operating system (a linux-based distribution) that is installed onto a server to provide an interface between the virtual machines and the physical hardware. It also consists of a small VM called the Service Console that is used to both control the VM's running on that host, but also to talk to wider vSphere cluster.
The install for ESX couldn't be much simpler. You have to make some choices regarding the sizes of the various disk partitions, much like any other Linux install, set some networking options, and off you go.
The problem comes a bit later in the game, because to make some of the magic work, all the hosts have to have exactly the same settings for their networking, virtual switches and storage controllers, and they all need to have hosts files pointing at each other and the Virtual Center managing it all. Remembering to do all that when it's 9pm on a Friday evening and you need to build a new host on the quick is not all that reliable.
Read on to see how this can be overcome...


