1. add new service
srvctl add service -d dbName -s serviceName -r ins1, ins2 -a ins3
2. add a new instance to service
srvctl add service -d dbName -s serviceName -u -r ins4 -a ins5
3. remove service
srvctl remove service -d dbName -s serviceName -i ins1
4. remove instance from service
srvctl remove service -d dbName -s serviceName-i ins1
-- Below 2 failed cases:
PRKP-1067 : Instance ins1 is the last available instance for service serviceName. Try modify service instead.
PRKP-1075 : Instance ins1 is the last preferred instance for service serviceName.
5. Upgrade instance to preferred
srvctl modify service -d dbName -s serviceName -i ins1 -r