You can deploy the vCenter Server Appliance on a host running ESXi 5.0 or later. Your system must also meet specific software and hardware requirements.

When you use Fully Qualified Domain Names, make sure that the machine you use for deploying the vCenter Server Appliance and the ESXi host are on the same DNS server.

Before you deploy the vCenter Server Appliance, synchronize the clocks of all virtual machines on the vSphere network. Unsynchronized clocks might result in authentication problems and can cause the installation to fail or prevent the vCenter Server services from starting. See Synchronizing Clocks on the vSphere Network.

Important: Upgrade of vCenter Server Appliance that is registered with an external vCenter Single Sign-On server is not supported. You can upgrade to vCenter Server Appliance 6.0 only if you use embedded vCenter Single Sign-On.