@mike_bronson7  You can achieve it in a similar way described on the following thread: https://community.cloudera.com/t5/Support-Questions/AMBARI-how-to-set-value-in-json-REST-API/td-p/290385   Example: AMBARI_FQDN=newhwx1.example.com CLUSTER_NAME=NewCluster DATANODES=newhwx1.example.com,newhwx2.example.com,newhwx3.example.com,newhwx5.example.com # curl -s -u admin:admin -H "X-Requested-By: ambari" -X PUT -d '{"RequestInfo":{"context":"Stop DataNodes","operation_level":{"level":"SERVICE","cluster_name":"'"$CLUSTER_NAME"'"},"query":"HostRoles/component_name=DATANODE&HostRoles/host_name.in('$DATANODES')&HostRoles/maintenance_state=OFF"},"Body":{"HostRoles":{"state":"INSTALLED"}}}' "http://$AMBARI_FQDN:8080/api/v1/clusters/$CLUSTER_NAME/host_components" . .   ... View more

@mike_bronson7  This like talks about the command link options to Stop various HDP components manually using CLI. (Including HS2 and Hive Metastore) https://docs.cloudera.com/HDPDocuments/HDP2/HDP-2.6.5/bk_reference/content/stopping_hdp_services.html ... View more

@mike_bronson7  If you want to get the HA Status (Active/Standby) for ResourceManager then you can make the following call: # curl -s -u admin:admin -H "X-Requested-By: ambari" -X GET "h ttp://$AMBARI_FQDN:8080/api/v1/clusters/$CLUSTER_NAME/host_components?HostRoles/component_name=RESOURCEMANAGER&HostRoles/ha_state.in(ACTIVE,STANDBY)" If you just want to know that which host the ResourceManager is in Active State then: # curl -s -u admin:admin -H "X-Requested-By: ambari" -X GET "h ttp://$AMBARI_FQDN:8080/api/v1/clusters/$CLUSTER_NAME/host_components?HostRoles/component_name=RESOURCEMANAGER&HostRoles/ha_state=ACTIVE"   . ... View more

@sarm  What is your HDFS version? Is it Hadoop 2.8.0, 3.0.0-alpha1 or higher?     # hadoop version     Quick check on what the JAR contains? # javap -cp /usr/hdp/3.1.0.0-78/hadoop/client/hadoop-hdfs-client.jar org.apache.hadoop.hdfs.web.resources.PutOpParam.Op | grep -i ALLOW public static final org.apache.hadoop.hdfs.web.resources.PutOpParam$Op ALLOWSNAPSHOT; public static final org.apache.hadoop.hdfs.web.resources.PutOpParam$Op DISALLOWSNAPSHOT;   For example i am able to use the same WebHDFS API call without any issue as following:   # curl -i -X PUT "http://kerlatest1.example.com:50070/webhdfs/v1/tmp/aaaa_bbbb?op=DISALLOWSNAPSHOT&user.name=hdfs" HTTP/1.1 200 OK Date: Tue, 14 Apr 2020 03:45:24 GMT Cache-Control: no-cache Expires: Tue, 14 Apr 2020 03:45:24 GMT Date: Tue, 14 Apr 2020 03:45:24 GMT Pragma: no-cache X-FRAME-OPTIONS: SAMEORIGIN Set-Cookie: hadoop.auth="u=hdfs&p=hdfs&t=simple&e=1586871924286&s=xxxxxxxx/yyyyyyyyy="; Path=/; HttpOnly Content-Type: application/octet-stream Content-Length: 0     Please refer to the following JIRA to verify if you are using the correct version (like 2.8.0, 3.0.0-alpha1 or higher) of HDFS where this option is available? Reference: https://issues.apache.org/jira/browse/HDFS-9057 https://cwiki.apache.org/confluence/display/HADOOP/Hadoop+2.8.0+Release (look for HDFS-9057) ... View more

@mike_bronson7  A good explanation for some delay is mentioned in JIRA AMBARI-20220: The ambari-server start and ambari-server restart commands are currently hard coded to wait a maximum of 50 seconds for the Jetty server to bind to port 8080 (or whatever the configured port is). Under normal circumstances, this value should be fine. However, since Jetty loads classes from views, the more views which are installed increases the total load time before Jetty binds to the server port. There could be few other reasons like a slightly high system resource utilisation when ambari was restarting could also cause little delay in opening the ambari api port. So you should try the following to fix this: - Edit the "/etc/ambari-server/conf/ambari.properties" and increase the following property value to 120 or 150 seconds. server.startup.web.timeout=120 - Then restart the ambari-server again. # ambari-server restart Reference: 1. https://issues.apache.org/jira/browse/AMBARI-20220 2. https://community.cloudera.com/t5/Support-Questions/change-the-port-for-ambari-server/m-p/214911#M176823   ... View more

@Gaurang1  As you are using VirtualBox to CM so can you please chck if you have configured Port Forwarding in VirtualBox in order to be able to access the port 7180 running inside the VM to outside of VirtualBox?   Reference: (from google search)  https://www.simplified.guide/virtualbox/port-forwarding https://www.howtogeek.com/122641/how-to-forward-ports-to-a-virtual-machine-and-use-it-as-a-server/ ... View more