Creating a sample discovered application

In order to test failover from the Primary managed cluster to the Secondary managed cluster and relocate for discovered applications, you need a sample application that is installed without using the RHACM create application capability.

Before you begin

Note: Regional-DR now supports leveraging CephRBD volumes using non-default replica-2 storage classes that are managed by Fusion Data Foundation. Support has also been extended to compression-enabled storage classes.

Procedure

Log in to the Primary managed cluster and clone the sample application repository.
```
git clone https://github.com/red-hat-storage/ocm-ramen-samples.git
```
Verify that you are on the main branch.
```
cd ~/ocm-ramen-samples
git branch
* main
```
The correct directory should be used when creating the sample application based on your scenario, metro or regional. To find your directory:
```
ls workloads/deployment | egrep -v 'cephfs|k8s|base'
```
```
odr-metro-rbd
odr-regional-rbd
odr-regional-cephfs
```
Create a project named busybox-discovered on both the Primary and Secondary managed clusters.
```
oc new-project busybox-discovered
```
Create the busybox application on the Primary managed cluster.
This sample application example is for Regional-DR using a block (Ceph RBD) volume. CephFS volumes can be used as well.
```
oc apply -k workloads/deployment/odr-regional-rbd -n busybox-discovered
```
```
persistentvolumeclaim/busybox-pvc created
deployment.apps/busybox created
```
Note:
Fusion Data Foundation disaster recovery solution now extends protection to discovered applications that span across multiple namespaces.

Verify that busybox is running in the correct project on the Primary managed cluster.

oc get pods,pvc,deployment -n busybox-discovered

NAME                           READY   STATUS    RESTARTS   AGE
pod/busybox-796fccbb95-qmxjf   1/1     Running   0          18s


NAME                                STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS                  VOLUMEATTRIBUTESCLASS   AGE
persistentvolumeclaim/busybox-pvc   Bound    pvc-b20e4129-902d-47c7-b962-040ad64130c4   1Gi        RWO            ocs-storagecluster-ceph-rbd   <unset>                 18s


NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/busybox   1/1     1            1           18