To install an ESXi host from a VMware runtime format (.vmx and .vmdk files), or to add .vmx files to an ESXi host, use the following syntax (uses default mappings):
> ovftool /ovfs/my_vm.vmx vi://username:pass@my_esx_host
> ovftool Nostaliga.vmx vi://user:pwd@host/Datacenter/host/host1.foo.com