Restoring a package installation from backup

Restore a previous DSE version from a package install.

1. Stop the DSE service if it is running.

   sudo service dse stop

2. Uninstall all DataStax Enterprise packages.
   • Debian and Ubuntu

     sudo apt-get purge "dse-*"

   • RHEL and CentOS

     sudo yum remove "dse-*"

3. Completely purge any existing data or configuration directories and files.

   sudo rm -rf /etc/dse
   sudo rm -rf /var/lib/cassandra
   sudo rm -rf /var/log/cassandra
   sudo rm -rf /var/run/cassandra
   sudo rm -rf /usr/share/dse
   sudo rm -rf /var/log/spark
   sudo rm -rf /var/lib/spark
   sudo rm -rf /var/lib/dsefs

4. Reinstall the old version as described in the documentation for that release of DataStax Enterprise.
   Important: Do not start DSE after installation.
5. Extract your backup to the root of your drive.

   sudo tar -xvf /backup_path/backup_archive_name.tar -C /

6. Move the snapshot files up two levels to their keyspace directories. Replace snapshot_name with the name of the snapshot created during the backup.

   sudo find /var/lib/cassandra/data -mindepth 2 -path '*/snapshots/snapshot_name/*' -type f \
   -exec bash -c 'dir={} && cd ${dir%/*} && mv {} ../..' \;

   Tip: If you cannot remember the snapshot name, you can find it by browsing the tar archive.
7. Restore permissions.

   sudo chown dse_username:dse_group /var/lib/cassandra

8. Start DSE.

   sudo service dse start

9. If you are using DSE Search, rebuild the index (4.5, 4.8, 5.0, 5.1, 6.0, 6.7).