Kubernetes change the recovery strategy PersistentVolume

PV recycling strategy

PersistentVolumes can have multiple recovery strategies, including the "Retain", "Recycle" and "Delete". For PersistentVolumes dynamically configured, the default recovery strategy "Delete". This means that when a user deletes the corresponding PersistentVolumeClaim, dynamic configuration of the volume will be automatically deleted. If the volume contains important data, this automatic behavior may be inappropriate. In that case, more suitable for "Retain" strategy. When using the "Retain", if a user deletes PersistentVolumeClaim, corresponding PersistentVolume will not be deleted. Instead, it becomes Released state, indicating that all the data can be restored manually.

Modify PV recycling policy methods 

    $ kubectl patch pv your-pv-name  -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'

View the recovery status of PV

[root@elasticsearch01 ~]# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                                            STORAGECLASS   REASON   AGE
ceph-rbd-pv                                20Gi       RWO            Recycle          Bound    default/ceph-rbd-pv-claim                                                212d
jenkins-home-pv                            40Gi       RWO            Recycle          Bound    default/jenkins-home-pvc                                                 98d
pvc-e7967cfe-7ded-11e9-a09d-52540089b2b6   50Gi       RWO            Delete           Bound    default/zhidao-harbor-chartmuseum                rbd                     90d
pvc-e7974d1c-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/zhidao-harbor-jobservice                 rbd                     90d
pvc-e7985b55-7ded-11e9-a09d-52540089b2b6   2000Gi     RWO            Delete           Bound    default/zhidao-harbor-registry                   rbd                     90d
pvc-e7d38097-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/database-data-zhidao-harbor-database-0   rbd                     90d
pvc-e7da3f3c-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/data-zhidao-harbor-redis-0               rbd                     90d

Recovering the modified state PV

[root@elasticsearch01 ~]# kubectl patch pv pvc-e7da3f3c-7ded-11e9-a09d-52540089b2b6  -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
persistentvolume/pvc-e7da3f3c-7ded-11e9-a09d-52540089b2b6 patched

View PV status has been changed to Retain the recovery

[root@elasticsearch01 ~]# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                                            STORAGECLASS   REASON   AGE
ceph-rbd-pv                                20Gi       RWO            Recycle          Bound    default/ceph-rbd-pv-claim                                                212d
jenkins-home-pv                            40Gi       RWO            Recycle          Bound    default/jenkins-home-pvc                                                 98d
pvc-e7967cfe-7ded-11e9-a09d-52540089b2b6   50Gi       RWO            Delete           Bound    default/zhidao-harbor-chartmuseum                rbd                     90d
pvc-e7974d1c-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/zhidao-harbor-jobservice                 rbd                     90d
pvc-e7985b55-7ded-11e9-a09d-52540089b2b6   2000Gi     RWO            Delete           Bound    default/zhidao-harbor-registry                   rbd                     90d
pvc-e7d38097-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Delete           Bound    default/database-data-zhidao-harbor-database-0   rbd                     90d
pvc-e7da3f3c-7ded-11e9-a09d-52540089b2b6   20Gi       RWO            Retain           Bound    default/data-zhidao-harbor-redis-0               rbd                     90d