How to change the startup setting of services in vCenter Server Appliance 6.x using command line

Due to any issue if you are unable to run service-control command on vCenter then use vMon-cli as alternate.
This command is available in windows as well as appliance based vCenter.

vmon-cli usage:

To check the startup type / status of any service  you can run below command:

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 root@vcsa67 [ /usr/lib/vmware-vmon ]# vmon-cli -s netdumper
 Name: netdumper
 Starttype: MANUAL
 RunState: STOPPED
 RunAsUser: netdumper
 CurrentRunStateDuration(ms): 951096147
 HealthState: UNHEALTHY
 FailStop: FALSE
 MainProcessId: N/A
 root@vcsa67 [ /usr/lib/vmware-vmon ]# 
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To change the startup type of the service from MANUAL to AUTOMATIC:

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 root@vcsa67 [ /usr/lib/vmware-vmon ]# vmon-cli  -S AUTOMATIC -U  netdumper
 Completed Service State Update request.
 root@vcsa67 [ /usr/lib/vmware-vmon ]# vmon-cli -s netdumper
 Name: netdumper
 Starttype: AUTOMATIC
 RunState: STOPPED
 RunAsUser: netdumper
 CurrentRunStateDuration(ms): 951200958
 HealthState: UNHEALTHY
 FailStop: FALSE
 MainProcessId: N/A
 root@vcsa67 [ /usr/lib/vmware-vmon ]#
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Similarly you can stop / start all vCenter service or start/stop single service using vmon-cli.