How To Un Register Ambari Agent From Ambari Server

An Ambari Service for Hue

Ambari service for easily installing and managing Hue on HDP cluster.

Authors:

Kyle Joe: Hue Install/Config/Start/Stop via Ambari

Version

Hue v3.11.0+
Ambari v2.4.0+

Setup

Deploy Hue on existing cluster

(Optional) To see Hue metrics in Ambari, login to Ambari (admin/admin) and start Ambari Metrics service http://$AMBARI_HOST:8080
To download the Hue service folder, run below

                VERSION=`hdp-select status hadoop-client | sed 's/hadoop-client - \([0-9]\.[0-9]\).*/\1/'` rm -rf /var/lib/ambari-server/resources/stacks/HDP/$VERSION/services/HUE   sudo git clone https://github.com/EsharEditor/ambari-hue-service.git /var/lib/ambari-server/resources/stacks/HDP/$VERSION/services/HUE

Restart Ambari

                service ambari-server restart

Then you can click on 'Add Service' from the 'Actions' dropdown menu in the bottom left of the Ambari dashboard:

On bottom left -> Actions -> Add service -> check Hue server -> Next -> Next -> Change any config you like (e.g. install dir, port) -> Next -> Deploy

Also ensure that the install location you are choosing (/usr/local/hue by default) does not exist
On successful deployment you will see the Hue service as part of Ambari stack and will be able to start/stop the service from here:
You can see the parameters you configured under 'Configs' tab
One benefit to wrapping the component in Ambari service is that you can now monitor/manage this service remotely via REST API

                export SERVICE=HUE export PASSWORD=admin export AMBARI_HOST=localhost export CLUSTER=DCenter  #get service status curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X GET http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE  #start service curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Start $SERVICE via REST"}, "Body": {"ServiceInfo": {"state": "STARTED"}}}' http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE  #stop service curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Stop $SERVICE via REST"}, "Body": {"ServiceInfo": {"state": "INSTALLED"}}}' http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE

Configuring Cluster and HUE

Hue uses a configuration file to understand information about Hadoop cluster and where to connect to. We'll need to configure our Hadoop cluster to accept connections from HUE, and add our cluster information to the HUE configuration file. We'll need to reconfigure our HDFS, Hive (WebHcatalog), and Oozie services to take advantage of HUE's features.tutorials from Hue

http://gethue.com/hadoop-hue-3-on-hdp-installation-tutorial/?replytocom=50032

Hue Service Action

UserSync: synchronize users from the current system or Ldap server
DatabaseSync: synchronize metastore from SQLite

Use Hue

The Hue webUI login page should come up at the below link: http://$HUE_HOSTNAME:8888

Remove service

To remove the Hue service:
- Stop the service via Ambari
- Unregister the service by running below from Ambari node

                export SERVICE=HUE export PASSWORD=admin export AMBARI_HOST=localhost  #detect name of cluster output=`curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari'  http://$AMBARI_HOST:8080/api/v1/clusters` CLUSTER=`echo $output | sed -n 's/.*"cluster_name" : "\([^\"]*\)".*/\1/p'`  #unregister service from ambari curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X DELETE http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE  #if above errors out, run below first to fully stop the service #curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Stop $SERVICE via REST"}, "Body": {"ServiceInfo": {"state": "INSTALLED"}}}' http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE

Remove artifacts

                rm -rf /usr/local/hue* rm -rf /var/log/hue rm -rf /var/run/hue rm /usr/hdp/current/hadoop-client/lib/hue-plugins-3.11.0-SNAPSHOT.jar