OpenShift API for Data Protection (OADP) restore use case

Following is a use case for using OADP to restore a backup to a different namespace.

Restoring an application to a different namespace using OADP

Restore a backup of an application by using OADP to a new target namespace, test-restore-application. To restore a backup, you create a restore custom resource (CR) as shown in the following example. In the restore CR, the source namespace refers to the application namespace that you included in the backup. You then verify the restore by changing your project to the new restored namespace and verifying the resources.

Prerequisites

You installed the OADP Operator.
You have the backup of an application to be restored.

Procedure

Create a restore CR as shown in the following example:
```
apiVersion: velero.io/v1
kind: Restore
metadata:
  name: test-restore
  namespace: openshift-adp
spec:
  backupName: <backup_name>
  restorePVs: true
  namespaceMapping:
    <application_namespace>: test-restore-application
```
where:

test-restore

Specifies the name of the restore CR.

<backup_name>

Specifies the name of the backup.

<application_namespace>

Specifies the target namespace to restore to. namespaceMapping maps the source application namespace to the target application namespace. test-restore-application is the name of target namespace where you want to restore the backup.
Apply the restore CR by running the following command:
```
$ oc apply -f <restore_cr_filename>
```

Verification

Verify that the restore is in the Completed phase by running the following command:
```
$ oc describe restores.velero.io <restore_name> -n openshift-adp
```
Change to the restored namespace test-restore-application by running the following command:
```
$ oc project test-restore-application
```

Verify the restored resources such as persistent volume claim (pvc), service (svc), deployment, secret, and config map by running the following command:

$ oc get pvc,svc,deployment,secret,configmap

Example output

NAME                          STATUS   VOLUME
persistentvolumeclaim/mysql   Bound    pvc-9b3583db-...-14b86

NAME               TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
service/mysql      ClusterIP   172....157     <none>        3306/TCP   2m56s
service/todolist   ClusterIP   172.....15     <none>        8000/TCP   2m56s

NAME                    READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/mysql   0/1     1            0           2m55s

NAME                                         TYPE                      DATA   AGE
secret/builder-dockercfg-6bfmd               kubernetes.io/dockercfg   1      2m57s
secret/default-dockercfg-hz9kz               kubernetes.io/dockercfg   1      2m57s
secret/deployer-dockercfg-86cvd              kubernetes.io/dockercfg   1      2m57s
secret/mysql-persistent-sa-dockercfg-rgp9b   kubernetes.io/dockercfg   1      2m57s

NAME                                 DATA   AGE
configmap/kube-root-ca.crt           1      2m57s
configmap/openshift-service-ca.crt   1      2m57s