- So the first thing is we have to have VSphere CLI installed. You can get that here: http://www.vmware.com/support/developer/vcli/
- Next, we need to download the patches. You can check your version/build number on your install, and match it up to the site. Go here: http://www.vmware.com/patchmgr/download.portaland download all the patches you need. They can be large, so only download what you require.
- Next, we’ll need a command prompt. Now PERL is not in my path, so my command line was rather long:
C:\Program Files (x86)\VMware\VMware vSphere CLI\Perl\bin>perl.exe ..\..\bin\vihostupdate.pl --server <server> --username <user> --password <password> -b "c:\vmware patches\<patch>.zip" -i
After that, your all set! This was a good source for the information also: http://blog.peacon.co.uk/how-to-patch-esxi-4-1/