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Application-Consistent Backups for Kubernetes Using Pre/Post Scripts

To implement application-consistent backups for Kubernetes, you can use pre-process and post-process script files on your access nodes.

For application consistency to work, the required CSI drivers must be installed and PVCs must be created using a supported CSI.

Commvault supplies and supports pre- and post-execution scripts for the following:

  • MySQL

  • PostgreSQL

  • MongoDB

  • Cassandra

Pre-scripts and post-scripts are script files that run before or after certain job phases. During backups, the script files are copied and executed inside the application pods.

The pre-scripts and post-scripts can be written in any scripting language, such as bash, Perl, or Python. To use Python scripts, you must pre-install Python in the pod.

Important

  • Backup jobs depend on the return codes of pre- and post-scripts. Any return code value other than 0 fails backup jobs. For the location of pre- and post-script output on your containerized application pod, refer to per-application implementations.

  • Pre-scripts and post-scripts are not supported on live volume backup.

Before You Begin

For this method to work, you must implement both a pre-execution script and a post-execution script. If you use only a pre-execution script, the script is not executed.

Procedure

  1. In the software_installation_directory, create a folder named kscripts/cluster_name as follows, where cluster_name is the name of the cluster, as specified in the Command Center:

    • On a Linux access node, create the folder in the Base directory.

    • On a Windows access node, create the folder in the ContentStore\Base folder.

      Note

      Pre-scripts and post-scripts fail if the Kubernetes cluster name (DisplayName) is renamed in Commvault.

  2. To execute the scripts for applications, create files in the folder kscripts\cluster_name with the following naming convention:

    • namespace.application_name.prescript

    • namespace.application_name.postscript

      where application_name is the name of the discovered application.

    To execute the scripts for all namespaces that have the specific application, use the following naming convention:

    • $.application_name.prescript

    • $.application_name.postscript

      where application_name is the name of the discovered application.

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