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  1. On the Ambari Server, browse to the /var/lib/ambari-server/resources/stacks/HDP/2.0.6/services directory.
  2. Create a directory named /var/lib/ambari-server/resources/stacks/HDP/2.0.6/services/TESTSRV

  3. In that directory, create a metainfo.xml file that describes the new service. For example:

    Code Block
    <?xml version="1.0"?>
<metainfo>
    <schemaVersion>2.0</schemaVersion>
    <services>
        <service>
            <name>TESTSRV</name>
            <comment>A New Test Service</comment>
            <version>0.1.0</version>
            <components>
                <component>
                    <name>TEST_CLIENT</name>
                    <category>CLIENT</category>
                    <commandScript>
                        <script>scripts/test_client.py</script>
                        <scriptType>PYTHON</scriptType>
                        <timeout>600</timeout>
                    </commandScript>
                </component>
            </components>
            <osSpecifics>
                <osSpecific>
                    <osFamily>any</osFamily>
                </osSpecific>
            </osSpecifics>
        </service>
    </services>
</metainfo>
  4. In the above, my service name is "TESTSRV", and it contains one component "TEST_CLIENT". That client is managed via the command script scripts/test_client.py. Next, let's create that command script.
  5. Create a directory for the script /var/lib/ambari-server/resources/stacks/HDP/2.0.6/services/TESTSRV/package/scripts.

  6. Browse to the scripts directory and create the test_client.py file. For example:

    Code Block
    import sys
from resource_management import *

class TestClient(Script):
  def install(self, env):
    print 'Install the client';
  def configure(self, env):
    print 'Configure the client';

if __name__ == "__main__":
  TestClient().execute()
  7. Now, restart Ambari Server for this new service definition to be distributed to all the Agents in the cluster.

...

  1. Add the Service to the Cluster.

    Code Block
    POST
/api/v1/clusters/MyCluster/services
{
"ServiceInfo": {
  "service_name":"TESTSRV"
  }
}

  2. Add the Components to the Service. In this case, add TEST_CLIENT to TESTSRV.

    Code Block
    POST
/api/v1/clusters/MyCluster/services/TESTSRV/components/TEST_CLIENT

  3. Install the component on a host. For example, on the c6403.ambari.apache.org host, first create the component resource, then have Ambari install the component.

    Code Block
    POST
/api/v1/clusters/MyCluster/hosts/c6403.ambari.apache.org/host_components/TEST_CLIENT
    Code Block
    PUT
/api/v1/clusters/MyCluster/hosts/c6403.ambari.apache.org/host_components/TEST_CLIENT

{
  "RequestInfo":{
    "context":"Install Test Srv"},
     "Body":{
      "HostRoles":{
        "state":"INSTALLED"
      }
   }
}

  4. Use the following to configure the client on the host. This will end up calling the configure() method in the command script.

    Code Block
    POST
/api/v1/clusters/MyCluster/requests
 
{
  "RequestInfo" : {
    "command" : "CONFIGURE",
    "context" : "Config Test Srv Client"
  },
  "Requests/resource_filters": [{
    "service_name" : "TESTSRV",
     "component_name" : "TEST_CLIENT",
    "hosts" : "c6403.ambari.apache.org"
  }]
}

  5. If you want to see which hosts the component is installed.

    Code Block
    GET
/api/v1/clusters/MyCluster/components/TEST_CLIENT