Run Containers as a Non-root User

In some Kubernetes environments, containers cannot be run as the root user. In this case, you can set securityContext to run containers as a non-root user.

Configure TiDB Operator containers

For TiDB Operator containers, you can configure security context in the Helm values.yaml file. All TiDB Operator components (at <controllerManager/scheduler/advancedStatefulset/admissionWebhook>.securityContext) support this configuration.

The following is an example configuration:

controllerManager:
  securityContext:
    runAsUser: 1000
    runAsGroup: 2000
    fsGroup: 2000

Configure containers controlled by CR

For the containers controlled by Custom Resource (CR), you can configure security context in any CRs (TidbCluster/DmCluster/TidbInitializer/TidbMonitor/Backup/BackupSchedule/Restore) to make the containers run as a non-root user.

You can use either of the following two types of configuration. If you configure both the cluster level and the component level for a component, only the configuration of the component level takes effect.

  • Configure podSecurityContext at the cluster level (spec.podSecurityContext) for all components. The following is an example configuration:

    spec:
      podSecurityContext:
        runAsUser: 1000
        runAsGroup: 2000
        fsGroup: 2000
    
  • Configure at the component level for a specific component. For example, configuring spec.tidb.podSecurityContext for TidbCluster, spec.master.podSecurityContext for DMCluster. The following is an example configuration:

    spec:
      pd:
        podSecurityContext:
          runAsUser: 1000
          runAsGroup: 2000
          fsGroup: 2000
      tidb:
        podSecurityContext:
          runAsUser: 1000
          runAsGroup: 2000
          fsGroup: 2000
    
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