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• If you are installing on CentOS/RHEL 7.1, you must be connected to an online repository for some critical updates. Offline installation is not supported for these operating system distributions.
• For security reasons, RHEL 7.3 is not supported for installation of Release 5.0 or later of the

  D s platform

  . Please upgrade to RHEL 7.4 or a later supported release.
  
• Installation on CentOS/RHEL versions 7.4 or earlier may require requires an upgrade of the RPM software on the

  D s node

  . Details are provided during the installation process.
  
• Disabling SELinux on the

  D s node

  is recommended. However, if security policies require it, you may need to apply some changes to the environment.
  

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For Ubuntu installations, the following packages must be manually installed using Ubuntu-specific versions:

• NginX 1.1217.27
• NodeJS 12.16.1

Instructions and version numbers are provided later in the process.

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• Java must be installed on each node of the cluster. For more information, see https://www.cloudera.com/documentation/enterprise/latest/topics/cdh_ig_jdk_installation.html.
• The versions of Java on the

  D s item
  item node

  and the Hadoop cluster do not have to match.

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