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Chapter 23. Configuring Persistent Volume Claim Protection

23.1. Overview
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OpenShift Container Platform 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.

Note

PVC protection is an alpha feature and may change in a future release of OpenShift Container Platform.

23.1.1. Enable PVC Protection
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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
...
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  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
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  3. On all masters and nodes, restart OpenShift Container Platform for the changes to take effect.
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