7. Validate the Installation

Validate the Apache Storm installation to verify a successful installation and configuration.

	Important
	You must start ZooKeeper before starting Storm.

Run the following command to start the Storm daemons:
- RHEL/CentOS/Oracle Linux
  su storm /usr/hdp/current/storm-supervisor/bin/storm supervisor
- SLES
  su storm /usr/hdp/current/storm-supervisor/bin/storm supervisor
- Ubuntu or Debian
  su storm /usr/hdp/current/storm-supervisor/bin/storm supervisor

Run the following command to view the status of the Storm daemons:

RHEL/CentOS/Oracle Linux
/usr/bin/supervisorctl status

SLES
/usr/bin/supervisorctl status

Ubuntu
service supervisor status
You should see output similar to the following:

storm-drpc RUNNING pid 3368, uptime 0:31:31
storm-logviewer RUNNING pid 3365, uptime 0:31:31
storm-nimbus RUNNING pid 3370, uptime 0:31:31
storm-supervisor RUNNING pid 8765, uptime 0:00:12
storm-ui RUNNING pid 3369, uptime 0:31:31

Point your browser to the following URL:
http://<storm-ui-server>:8080
You should see the Storm UI web page:
Run the following command to run the WordCount sample topology:
storm jar /usr/hdp/current/storm-client/contrib/storm-starter/storm-starter-*.*-jar-with-dependencies.jar storm.starter.WordCountTopology wordcount

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