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Doing makes things easier from an administration perspective of course, but also introduces some risk.

Depending on the sensitivity of data in your cluster you may wish to enable IP Tables.

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It is challenging to construct an SELinux policy that governs all the different components in the Hadoop ecosystem, and so most of our customers run with SELinux disabled.Then make sure all of the Hadoop traffic is on one VLAN for ease of troubleshooting and isolation.Cloudera Manager does a good job of identifying known and common issues in the OS configuration, but double-check the following: Some customers disable IPTables completely in their initial cluster setup.Learn how to set up a Hadoop cluster in a way that maximizes successful production-ization of Hadoop and minimizes ongoing, long-term adjustments.Previously, we published some recommendations on selecting new hardware for Apache Hadoop deployments.

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