It's expecting the role/instance name of your NN, you can retrieve that by    example code using python from cm_api.api_client import ApiResource api = ApiResource(server_host="nightly57-1.gce.cloudera.com") #assuming your cluster name is 'Cluster 1' and hdfs service name is 'HDFS-1' NameNodes = api.get_cluster("Cluster 1").get_service("HDFS-1").get_roles_by_type("NAMENODE") print [instance.name for instance in NameNodes] # sample stdout  [u'HDFS-1-NAMENODE-51999a2564364e0f3a6a74def356741b', u'HDFS-1-NAMENODE-46bf2f74734fa565bb829ef019ff4a2d']   Alternatively, open your browser to http://cm_server:port/api/v6/clusters/{clusterName}/services/{HdfsServiceName}/roles     ... "items" : [ { "name" : "HDFS-1-NAMENODE-51999a2564364e0f3a6a74def356741b", <=== this "type" : "NAMENODE", ... see: https://cloudera.github.io/cm_api/apidocs/v11/path__clusters_-clusterName-_services_-serviceName-_roles.html     ... View more

based on issues I've seen they most leads to jumbo framing configuration 😞 could you verify that is working [1] alternative installation path is to install the packages manually on the node, then vi /etc/cloudera-scm-agent/config.ini and set the Hostname of the CM server - server_host=....   eg; yum clean all rpm --import http://archive.cloudera.com/cdh5/redhat/6/x86_64/cdh/RPM-GPG-KEY-cloudera # below is for the latest CM5  # modify the baseurl in/etc/yum.repos.d/cloudera-manager.repo and point to the desire CM version # example for version 5.5.1 baseurl=http://archive.cloudera.com/cm5/redhat/6/x86_64/cm/5.5.1/ wget http://archive.cloudera.com/cm5/redhat/6/x86_64/cm/cloudera-manager.repo -O /etc/yum.repos.d/cloudera-manager.repo yum install -y oracle-j2sdk* cloudera-manager-{daemons,agent}   [1] https://www.mylesgray.com/hardware/test-jumbo-frames-working/ ... View more

"I am putting the following HTTP URL in the address bar, e.g. " the URL that you type in the address bar is translated into GET by the web browser, not a PUT method. You could use a REST client (web browser) plugin to assist your with submitting PUT/POST/DELETE methods from your browser. ... View more