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Ambari Server: Check /var/log/ambari-server/ambari-server.\[log\|out\] for errors.
Ambari Agent: Check /var/log/ambari-agent/ambari-agent.\[log\|out\] for errors.
Note that if Ambari Agent has any output in /var/log/ambari-agent/ambari-agent.out, it is indicative of a significant problem.

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• Stop all the services on all the nodes(including ganglia and nagios)
• It is also a good practice to delete the rpms from all nodes.

• search for the rpms:
  rpm -qa | grep ganglia
  rpm -qa | grep oozie
  rpm -qa | grep sqoop
  rpm -qa | grep pig
  rpm -qa | grep nagios
  rpm -qa | grep hadoop

• and remove them :
  rpm -e <package name>