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General Troubleshooting

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.

Services fail to start up

• HDFS: Check log files under /var/log/hadoop/hdfs
• MapReduce: Check log files under /var/log/hadoop/mapred

Nagios alerts don't show up in Ambari Web

• Run "service httpd restart"

Installing a new cluster on top of an existing cluster

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