In my Lab I was exploring the upgrade possibilities from ESX 3.5 to the next version.  Usually I do a full reinstall just to be absolutely sure there’s no old packages floating around. For testing purposes I decided to do an upgrade of the ESX host. I opened up Update Manager and with a couple simple clicks I upgraded my host to the next version. (I did an upgrade of vCenter and Update Manager before I even started.) I removed a couple of screenshots that didn’t contain much useful info, in total it were 15 steps to create a baseline and update the host:

Create a new Baseline:

Give it a name and select the Type:

Browse to the ISO of the next generation of ESX and upload it:

Specific parameters of the upgrade, notice that the COS will end up in a VMDK:

You might want to have an escape option:

Almost done:

Attach the Baseline to the cluster and all there’s left is “Right click, remediate, next next finish”:

Easy as 1 2 3…