VMware vCloud admins heads up, please note that recently released RHEL, CentOS and Oracle Linux 7 releases are NOT supported on current vCloud Director 5.5 releases. And in this case “no supported” also means not going to work!
RHEL 7 introduced radical OS level changes which require changes in vCloud Director guest customization workflows, mostly on VMware Tools part. Until these changes are made into vCloud Director stack you should stick with RHEL 6 release and derivatives for vCloud Director managed virtual machines.
VMware vCloud Director supported guest OSes are listed on VMware KB article 2058524.