ESXi 4.1 brought changes to the patching process. Previously, the Host Update utility — an application included with the vSphere Client — could patch ESXi 4.0 hosts. VMware removed Host Update from ESXi 4.1, presumably to encourage users to upgrade to paid versions that are managed and patched with vCenter Server’s Update Manager. As a result, the only method left to patch the free version of ESXi is with the vihostupdate command-line utility, which is included in the vSphere Command-Line Interface (CLI).
Before using this method, it’s important to understand how the patches work and where to find them.
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