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How to Make Veeam Kasten for Kubernetes Grafana Pod rootless

KB ID: 4630
Product: Veeam Kasten for Kubernetes
Published: 2024-06-17
Last Modified: 2024-06-17
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Purpose

This article explains how to disable init-container in k10-grafana to run it as rootless.

Cause

Veeam Kasten for Kubernetes installation provides an instance of Grafana that is deployed automatically and can be used to query metrics from Kasten's Prometheus instance. This grafana pod is run as the user `grafana` with the UID & GID set to 472. However, by default, Veeam Kasten for Kubernetes uses an init-container, which runs as root to prepare the filesystem for grafana. 

Below are the default values for the Grafana in the Veeam Kasten for Kubernetes helm chart:

grafana:
    securityContext:
        runAsUser: 472
        runAsGroup: 472
        fsGroup: 472
    initChownData:
        enabled: true

The only function of the init-container (init-chown-data) is to set up the filesystem in grafana PVC with proper permissions. With the usage of the `fsGroup` in grafana pods's securityContext or by manually changing the ownership(for shared filesystems like NFS), the usage of the init-contianer can be eliminated.

Solution

This article provides instructions for two types of storageClasses with which the grafana PVC is provisioned.

  • Storages which supports fsGroup parameter.
  • Shared filesystem (eg. NFS)

Storages that supports fsGroup parameter

By default k10-grafana runs with fsGroup=472. All the files created by Grafana will have GID=472, and Kubernetes(or CSI driver) will set the same GID for all the files in the storage. 
This means that there is no need for any additional securityContext if the fsGroup is supported. The following helm values can be used to disable init-container(init-chown-data) in k10-grafana.

grafana:
    securityContext:
        runAsUser: 472
        runAsGroup: 472
        fsGroup: 472
    initChownData:
        enabled: false

Shared Filesystem (eg. NFS)

For shared filesystems,  "var/lib/grafana" directory has to be created manually on the shared filesystem and set the correct owner for it. 

Below are the commands to create the directory structure and change the ownership of the directories to the user that k10-grafana container use.

#create the directory structure
mkdir -p var/lib/grafana
#chown recursively 
chown -R 472:472 var/lib/grafana
The commands in the previous instructions assume that the current working directory is inside the Veeam Kasten for Kubernetes Grafana PVC or the directory referenced in the Veeam Kasten for Kubernetes Grafana PV (in the case of NFS volumes).

The helm values below can be used to disable init-container(init-chown-data) in k10-grafana.

grafana:
    securityContext:
        runAsUser: 472
        runAsGroup: 472
    initChownData:
        enabled: false
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