After installing VMware vCloud Director 5.5, you are given an option to start the service immediately. However, if you decide not to start the service at this time as in perhaps you are prepping more than one vCloud Director server, then you can start the cloud director service at a later time and it can be done manually.
vCloud Director runs on Linux; redhat, centos. The command line to start the vcloud director service is the same.
The command to start the vCloud Director service is :
service vmware-vcd start
The command to stop the vCloud Director service is :
service vmware-vcd stop