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This tutorial will show you how to restore backed up volume using Stash. Here, we are going to recover backed up data into a PVC. Then, we are going to re-deploy the workload using the recovered volume.
To proceed with this tutorial, you have to meet following requirements:
At first, you need to have some backup taken by Stash. If you already don’t have any backup repository, create one by following this backup tutorial.
You need to have the storage
Secret that was used to take backup. If you don’t have the
Secret, create one with valid credentials.
You need to have
Repository crd that was created for the respective backup. If you have lost the
Repository crd, you have to create it manually with respective backend information. Follow, this guide to understand structure of
You should be familiar with the following Stash concepts:
To keep things isolated, we are going to use a separate namespace called
demo throughout this tutorial. Create the namespace if you haven’t created yet.
$ kubectl create ns demo namespace/demo created
The following diagram shows how Stash recovers backed up data from a backend. Open the image in a new tab to see the enlarged version.
The volume recovery backup process consists of the following steps:
Recoverycrd that specifies the target
Repositoryfrom where he/she want to recover. It also specifies one or more volumes (
recoveredVolumes) where the recovered data will be stored.
Recoverycrds. If it sees one, it checks if the referred
Repositorycrd exists or not.
Jobto recover the backed up data.
Jobreads the backend information from
Repositorycrd and the backend credentials from the storage
Jobrecovers data from the backend and stores it in the target volume.
Now, we are going to recover backed up data from
deployment.stash-demo Repository that was created while taking backup into a PVC named
At first, let’s delete
Restic crd so that it does not lock the repository while are recovering from it. Also, delete
stash-demo deployment and
stash-sample-data ConfigMap if you followed our backup guide.
$ kubectl delete deployment -n demo stash-demo deployment.extensions "stash-demo" deleted $ kubectl delete restic -n demo local-restic restic.stash.appscode.com "local-restic" deleted $ kubectl delete configmap -n demo stash-sample-data configmap "stash-sample-data" deleted
Note: In order to perform recovery, we need
Repositorycrd (in our case
deployment.stash-demo) and backend secret (in our case
We are going to recover backed up data into a PVC. At first, we need to know available StorageClass in our cluster.
$ kubectl get storageclass NAME PROVISIONER AGE standard (default) k8s.io/minikube-hostpath 8h
Now, let’s create a
PersistentVolumeClaim where our recovered data will be stored.
$ kubectl apply -f https://github.com/stashed/docs/raw/v2021.11.24/docs/examples/recovery/pvc.yaml persistentvolumeclaim/stash-recovered created
Here is the definition of the
PersistentVolumeClaim we have created above,
apiVersion: v1 kind: PersistentVolumeClaim metadata: name: stash-recovered namespace: demo labels: app: stash-demo spec: storageClassName: standard accessModes: - ReadWriteOnce resources: requests: storage: 50Mi
Check whether cluster has provisioned the requested claim.
$ kubectl get pvc -n demo -l app=stash-demo NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE stash-recovered Bound pvc-e6ffface-fa01-11e8-8905-0800277ca39d 50Mi RWO standard 13s
Look at the
stash-recovered PVC is bounded to volume
Create Recovery CRD:
Now, we have to create a
Recovery crd to recover backed up data into this PVC.
The resource definition of the
Recovery crd we are going to create is below:
apiVersion: stash.appscode.com/v1alpha1 kind: Recovery metadata: name: local-recovery namespace: demo spec: repository: name: deployment.stash-demo namespace: demo paths: - /source/data recoveredVolumes: - mountPath: /source/data persistentVolumeClaim: claimName: stash-recovered
spec.repository.namespecifies the name of the
Repositorycrd that represents respective restic repository.
spec.repository.namespacespecifies the namespace of
spec.pathsspecifies the file-group paths that were backed up using
spec.recoveredVolumesindicates an array of volumes where snapshots will be recovered. Here,
mountPathspecifies where the volume will be mounted. Note that,
Recoveryrecovers data in the same paths from where the backup was taken (specified in
spec.paths). So, volumes must be mounted on those paths or their parent paths.
Let’s create the Recovery crd we have shown above,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2021.11.24/docs/examples/recovery/recovery.yaml recovery.stash.appscode.com/local-recovery created
Recovery job completes its task. To verify that recovery has completed successfully run,
$ kubectl get recovery -n demo local-recovery NAME REPOSITORY-NAMESPACE REPOSITORY-NAME SNAPSHOT PHASE AGE local-recovery demo deployment.stash-demo Succeeded 54s
Succeeded indicates that our recovery has been completed successfully. Backup data has been restored in
stash-recovered PVC. Now, we are ready to use this PVC to re-deploy the workload.
If you are using Kubernetes version older than v1.11.0 then run following command and check
status.phase field to see whether the recovery succeeded or failed.
$ kubectl get recovery -n demo local-recovery -o yaml
We have successfully restored backed up data into
stash-recovered PVC. Now, we are going to re-deploy our previous deployment
stash-demo. This time, we are going to mount the
stash-recovered PVC as
source-data volume instead of ConfigMap
Below is the YAML for
stash-demo deployment with
stash-recovered PVC as
apiVersion: apps/v1 kind: Deployment metadata: labels: app: stash-demo name: stash-demo namespace: demo spec: replicas: 1 selector: matchLabels: app: stash-demo template: metadata: labels: app: stash-demo name: busybox spec: containers: - args: - sleep - "3600" image: busybox imagePullPolicy: IfNotPresent name: busybox volumeMounts: - mountPath: /source/data name: source-data restartPolicy: Always volumes: - name: source-data persistentVolumeClaim: claimName: stash-recovered
Let’s create the deployment,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2021.11.24/docs/examples/recovery/recovered-deployment.yaml deployment.apps/stash-demo created
Verify Recovered Data:
We have re-deployed
stash-demo deployment with recovered volume. Now, it is time to verify that the recovered data are present in
Get the pod of new deployment,
$ kubectl get pod -n demo -l app=stash-demo NAME READY STATUS RESTARTS AGE stash-demo-69694789df-kvcp5 1/1 Running 0 20s
Run following command to view data of
/source/data directory of this pod,
$ kubectl exec -n demo stash-demo-69694789df-kvcp5 -- ls -R /source/data /source/data: LICENSE README.md
So, we can see that the data we had backed up from original deployment are now present in re-deployed deployment.
With the help of Snapshot object, Stash allows users to recover from a particular snapshot. Here is an example of how to recover from a specific snapshot.
First, list the available snapshots,
$ kubectl get snapshots -n demo -l repository=deployment.stash-demo NAME AGE deployment.stash-demo-bd8db133 4m50s deployment.stash-demo-b6e67dee 3m50s deployment.stash-demo-10790cf0 2m50s deployment.stash-demo-1ace430f 110s deployment.stash-demo-baff6c47 50s
Note: If you are using Local backend for storing backup snapshots, your workload must be running to be able to list snapshots.
Below is the YAML for
Recovery crd referring to a specific snapshot.
apiVersion: stash.appscode.com/v1alpha1 kind: Recovery metadata: name: local-recovery-specific-snapshot namespace: demo spec: repository: name: deployment.stash-demo namespace: demo snapshot: deployment.stash-demo-baff6c47 paths: - /source/data recoveredVolumes: - mountPath: /source/data persistentVolumeClaim: claimName: stash-recovered
Now, create a
Recovery crd shown above,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2021.11.24/docs/examples/recovery/recovery-specific-snapshot.yaml recovery.stash.appscode.com/local-recovery-specific-snapshot created
To cleanup the resources created by this tutorial, run following commands:
$ kubectl delete recovery -n demo local-recovery $ kubectl delete recovery -n demo local-recovery-specific-snapshot $ kubectl delete secret -n demo local-secret $ kubectl delete deployment -n demo stash-demo $ kubectl delete pvc -n demo stash-recovered $ kubectl delete repository -n demo deployment.stash-demo $ kubectl delete ns demo
If you would like to uninstall Stash operator, please follow the steps here.