This solved my issue. In my case, the ambari database is a postgresql Database. ... View more

@bob bza You may also find the information you see in this article: Using Ambari to Automate Knox Topology Definitions. Specifically, while the following API will get you all the host component details, including the host(s), api/v1/clusters/clustername/services/YARN/components/RESOURCEMANAGER it will not get you the appropriate ports. For that, you need to interrogate the active YARN service configuration: api/v1/clusters/clustername/configurations/service_config_versions?service_name=YARN And look for the yarn-site configuration type, and the following properties therein: yarn.http.policy This will tell you if http is sufficient, or if you need to use https yarn.resourcemanager.address The value of this property is the HOST:PORT address you originally requested. I hope that helps... ... View more