I'm looking to upgrade our vSphere 5.1 host to 5.5, and I see numerous references to vCenter. The admin who setup our vSphere (no longer with company) either removed vCenter or never installed it.
Do we need vCenter to do upgrades or manage the host? (So far I've used vSphere client for everything I need).
If so, how do I add back the vCenter vm? I'm nervous about re-running vmware installer since I can't risk blowing away the company's (virtual) servers. Is there a vCenter image / vmdk I can simply download and copy to the host?