The serverctl command can be used to start and stop services in OS X Server. Use serverctl with a list verb to show a list of services:
serverctl list
Grab a service (without the quotes) and feed it back into serverctl with the enable option and a service= option to identify the service:
serverctl enable service=com.apple.servermgrd.xcode
Or disable, using the disable verb:
serverctl disable service=com.apple.servermgrd.xcode
