THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
Services managed by Ambari are defined in its stacks folder.
To define your own services and stacks to be managed by Ambari, follow the steps below to define your own services or stacks
A stack is a distribution of a set of services. Multiple versions of a stack can be defined, each with its own set of services. Stacks in Ambari are defined in ambari-server/src/main/resources/stacks folder, which can be found at /var/lib/ambari-server/resources/stacks folder after install.
Services managed by a stack can be defined either in ambari-server/src/main/resources/common-services or ambari-server/src/main/resources/stacks folders. These folders after install can be found at /var/lib/ambari-server/resources/common-services or /var/lib/ambari-server/resources/stacks folders respectively.
Question: When do I define service in common-services vs. stacks folders?
One would define services in the common-services folder if there is possibility of the service being used in multiple stacks. For example, almost all stacks would need the HDFS service - so instead of redefining HDFS in each stack, the one defined in common-services is referenced from multiple stack-versions. Likewise, if a service is going to be contained in only one stack and never going to be shared, it can be defined in the stacks folder. Basically services defined in stacks folder are by used containment, whereas the ones defined in common-services are used by reference.