> For the complete documentation index, see [llms.txt](https://docs.pentaho.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pentaho.com/pdc-10.2-data-optimizer/pdso-install-landing-page/pdso-install-in-hadoop-cluster/pdso-install-landing-page-hadoop-installation/installing-data-storage-optimizer-on-apache-ambari-cluster/step-3-install-the-mpack-on-the-apache-ambari-server.md).

# Step 3: Install the mpack on the Apache Ambari server

Follow the steps below to put the Data Optimizer software in Apache Ambari’s extension cache.

**Note:** As a best practice, perform the following steps with the same user credentials as the Ambari administrator.

1. Copy the mpack file to a temporary directory on the Ambari server, for example `/tmp/pdso-mpack-1.0.0.0.tar.gz`
2. Connect to the Ambari server using a Secure Shell (SSH) protocol.
3. Install the mpack with the following command, updated for your mpack location: `ambari-server install-mpack --verbose --mpack=/tmp/pdso-mpack-1.0.0.0.tar.gz`
4. Restart the Ambari server.

   This step refreshes Ambari server’s stale memory cache so it recognizes the Data Optimizer extension.


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