Installing Oracle JDK for Cloudera Runtime using a tarball

This section is optional. Cloudera Runtime requires a JDK to be installed on all cluster hosts prior to Cloudera Manager and Cloudera Runtime installation. Cloudera Manager can automatically install an OpenJDK that has been pre-packaged by Cloudera. This OpenJDK provided by Cloudera may not be the latest version. If you do not want to use the OpenJDK provided by Cloudera, you can follow these instructions to install the Oracle JDK.

The Oracle JDK installer is available both as an RPM-based installer for RPM-based systems, and as a binary installer for other systems.

Download the .tar.gz file for one of the supported versions of the Oracle JDK from Java SE 8 Downloads, Java SE 7 Downloads or Java SE 6 Downloads.
Extract the JDK to /usr/java/jdk-version; for example /usr/java/jdk.1.7.0_nn or /usr/java/jdk.1.8.0_nn, where nn is the supported version.
Set JAVA_HOME to the directory where the JDK is installed. Add the following line to the specified files:
```
export JAVA_HOME=/usr/java/jdk.1.7.0_nn
```
note
- Cloudera Manager Server host: /etc/default/cloudera-scm-server. This affects only the Cloudera Manager Server process, and does not affect the Cloudera Management Service roles.
- All hosts in an unmanaged deployment: /etc/default/bigtop-utils. You do not need to perform this for clusters managed by Cloudera Manager.
Follow the instructions in Configuring a Custom Java Home Location. This change affects all CDH cluster processes and Cloudera Management Services in your cluster.

note

This method of changing the JDK for Cloudera Manager, Cloudera Management Service roles, and CDH cluster processes does not affect the JDK used by other non-Cloudera processes.

After you have finished, continue to Step 3: Install and configure Databases.