Hadoop Security Guide
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Manually Enabling Audit Settings in Ambari Clusters

It is recommended that Ranger audits be written to both Solr and HDFS. Audits to Solr are primarily used to enable queries from the Ranger Admin UI. HDFS is a long-term destination for audits; audits stored in HDFS can be exported to any SIEM system, or to another audit store.

Solr and HDFS audits are generally enabled as part of the standard Ambari installation procedure. This section describes how to manually update Ambari audit settings for Solr and HDFS.