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Configuring Persistent Volume Claim Protection

Overview

OKD can be configured to have the persistent volume claim (PVC) protection feature enabled. This feature ensures that PVCs in active use by a pod are not removed from the system, as this may result in data loss.

PVC protection is an alpha feature and may change in a future release of OKD.

Enable PVC Protection

To enable the PVCProtection feature gate on all masters and nodes:

  1. Edit or create the master configuration file on all masters (/etc/origin/master/master-config.yaml by default):

    1. Add PVCProtection=true under the apiServerArguments and controllerArguments sections.

    2. Add PVCProtection admission plugin configuration under the admissionConfig section.

      admissionConfig:
  pluginConfig:
    PVCProtection:
      configuration:
        apiVersion: v1
        disable: false
        kind: DefaultAdmissionConfig
...
kubernetesMasterConfig:
...
  apiServerArguments:
    feature-gates:
    - PVCProtection=true
...
  controllerArguments:
    feature-gates:
    - PVCProtection=true
...

  2. On all nodes, edit or create the node configuration file (/etc/origin/node/node-config.yaml by default), and add the PVCProtection=true feature gate under kubeletArguments:

    kubeletArguments:
  feature-gates:
  - PVCProtection=true

  3. On all masters and nodes, restart OKD for the changes to take effect.