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Minio is an open source object storage server compatible with AWS S3 cloud storage service. This tutorial will show you how to use Stash to backup and restore a volume with a Minio backend. Here, we are going to backup the
/source/data folder of a busybox pod into a Minio bucket. Then, we are going to show how to recover this data into a
PersistentVolumeClaim(PVC). We are going to also re-deploy deployment using this recovered volume.
At first, you need to have a Kubernetes cluster, and the
kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using kind.
Stash in your cluster following the steps here.
You should be familiar with the following Stash concepts:
You will need a TLS secured Minio server to store backed up data. If you already do not have a Minio server running, deploy one following the tutorial from here. For this tutorial, we have deployed Minio server in
storage namespace and it is accessible through
To keep things isolated, we are going to use a separate namespace called
demo throughout this tutorial.
$ kubectl create ns demo namespace/demo created
In order to take backup, we need some sample data. Stash has some sample data in stash-data repository. As gitRepo volume has been deprecated, we are not going to use this repository as volume directly. Instead, we are going to create a configMap from the stash-data repository and use that ConfigMap as data source.
Let’s create a ConfigMap from these sample data,
$ kubectl create configmap -n demo stash-sample-data \ --from-literal=LICENSE="$(curl -fsSL https://github.com/stashed/stash-data/raw/master/LICENSE)" \ --from-literal=README.md="$(curl -fsSL https://github.com/stashed/stash-data/raw/master/README.md)" configmap/stash-sample-data created
Now, deploy the following Deployment. Here, we have mounted the ConfigMap
stash-sample-data as data source volume.
Below, the YAML for the Deployment we are going to create.
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 configMap: name: stash-sample-data
Let’s create the deployment we have shown above,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2020.12.17/docs/examples/platforms/minio/deployment.yaml deployment.apps/stash-demo created
Now, wait for deployment’s pod to go in
$ kubectl get pod -n demo -l app=stash-demo NAME READY STATUS RESTARTS AGE stash-demo-7ccd56bf5d-n24vl 1/1 Running 0 16s
You can check that the
/source/data/ directory of this pod is populated with data from the
stash-sample-data ConfigMap using this command,
$ kubectl exec -n demo stash-demo-7ccd56bf5d-n24vl -- ls -R /source/data /source/data: LICENSE README.md
Now, we are ready to backup
/source/data directory into a Minio bucket.
At first, we need to create a secret for
Restic crd. To configure this backend, the following secret keys are needed:
Create the secret as below,
$ echo -n 'changeit' > RESTIC_PASSWORD $ echo -n '<your-minio-access-key-id-here>' > AWS_ACCESS_KEY_ID $ echo -n '<your-minio-secret-access-key-here>' > AWS_SECRET_ACCESS_KEY $ cat ./directory/of/root/certificate/ca.crt > CA_CERT_DATA $ kubectl create secret generic -n demo minio-secret \ --from-file=./RESTIC_PASSWORD \ --from-file=./AWS_ACCESS_KEY_ID \ --from-file=./AWS_SECRET_ACCESS_KEY \ --from-file=./CA_CERT_DATA secret/minio-secret created
Verify that the secret has been created successfully,
$ kubectl get secret -n demo minio-secret -o yaml
apiVersion: v1 data: AWS_ACCESS_KEY_ID: bXktYWNjZXNzLWtleQ== AWS_SECRET_ACCESS_KEY: bXktc2NyZXQta2V5 CA_CERT_DATA: <base64 endoded ca.crt data> RESTIC_PASSWORD: Y2hhbmdlaXQ= kind: Secret metadata: creationTimestamp: 2018-12-05T11:42:48Z name: minio-secret namespace: demo resourceVersion: "36660" selfLink: /api/v1/namespaces/demo/secrets/minio-secret uid: e3a2f905-f882-11e8-9a81-0800272171a4 type: Opaque
Now, we are going to create
Restic crd to take backup
/source/data directory of
stash-demo deployment. This will create a repository in the Minio bucket specified by
s3.bucket field and start taking periodic backup of
$ kubectl apply -f https://github.com/stashed/docs/raw/v2020.12.17/docs/examples/platforms/minio/restic.yaml restic.stash.appscode.com/minio-restic created
Below, the YAML for Restic crd we have created above,
apiVersion: stash.appscode.com/v1alpha1 kind: Restic metadata: name: minio-restic namespace: demo spec: selector: matchLabels: app: stash-demo fileGroups: - path: /source/data retentionPolicyName: 'keep-last-5' backend: s3: endpoint: 'https://minio.storage.svc' bucket: stash-repo prefix: demo storageSecretName: minio-secret schedule: '@every 1m' volumeMounts: - mountPath: /source/data name: source-data retentionPolicies: - name: 'keep-last-5' keepLast: 5 prune: true
If everything goes well, Stash will inject a sidecar container into the
stash-demo deployment to take periodic backup. Let’s check that sidecar has been injected successfully,
$ kubectl get pod -n demo -l app=stash-demo NAME READY STATUS RESTARTS AGE stash-demo-57656f6d74-hmc9z 2/2 Running 0 46s
Look at the pod. It now has 2 containers. If you view the resource definition of this pod, you will see that there is a container named
stash which running
Stash will create a
Repository crd with name
deployment.stash-demo for the respective repository in Minio backend at first backup schedule. To verify, run the following command,
$ kubectl get repository deployment.stash-demo -n demo NAME BACKUPCOUNT LASTSUCCESSFULBACKUP AGE deployment.stash-demo 1 14s 1m
BACKUPCOUNT field indicates number of backup snapshot has taken in this repository.
Restic will take backup of the volume periodically with a 1-minute interval. You can verify that backup snapshots has been created successfully by,
$ kubectl get snapshots -n demo -l repository=deployment.stash-demo NAME AGE deployment.stash-demo-c588c67c 4m3s deployment.stash-demo-7dc0c17d 3m3s deployment.stash-demo-21228047 2m3s deployment.stash-demo-15873428 63s deployment.stash-demo-a29263b1 3s
Here, we can see 5 last successful backup Snapshot taken by Stash in
If you navigate to
<bucket name>/demo/deployment/stash-demo directory in your Minio Web UI. You will see, a repository has been created there.
To view the snapshot files, navigate to
snapshots directory of the repository,
Stash keeps all backup data encrypted. So, snapshot files in the bucket will not contain any meaningful data until they are decrypted.
Now, consider that we have lost our workload as well as data volume. We want to recover the data into a new volume and re-deploy the workload.
At first, let’s delete
stash-demo deployment and
$ kubectl delete deployment -n demo stash-demo deployment.extensions "stash-demo" deleted $ kubectl delete restic -n demo minio-restic restic.stash.appscode.com "minio-restic" deleted $ kubectl delete configmap -n demo stash-sample-data configmap "stash-sample-data" deleted
In order to perform recovery, we need
deployment.stah-demo and backend secret
minio-secret to exist.
In case of cluster disaster, you might lose
Repositorycrd and backend secret. In this scenario, you have to create the secret again and
Repositorycrd manually. Follow the guide to understand
Repositorycrd structure from here.
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/v2020.12.17/docs/examples/platforms/minio/pvc.yaml persistentvolumeclaim/stash-recovered created
Below the YAML for
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 that if 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-3d3b6a58-f886-11e8-9a81-0800272171a4 50Mi RWO standard 13s
Look at the
stash-recovered PVC is bounded to volume
Now, we have to create a
Recovery crd to recover backed up data into this PVC.
$ kubectl apply -f https://github.com/stashed/docs/raw/v2020.12.17/docs/examples/platforms/minio/recovery.yaml recovery.stash.appscode.com/minio-recovery created
Below, the YAML for
Recovery crd we have created above.
apiVersion: stash.appscode.com/v1alpha1 kind: Recovery metadata: name: minio-recovery namespace: demo spec: repository: name: deployment.stash-demo namespace: demo paths: - /source/data recoveredVolumes: - mountPath: /source/data persistentVolumeClaim: claimName: stash-recovered
Recovery job completes its task. To verify that recovery has completed successfully run,
$ kubectl get recovery -n demo minio-recovery NAME REPOSITORYNAMESPACE REPOSITORYNAME SNAPSHOT PHASE AGE minio-recovery demo deployment.stash-demo Succeeded 26s
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 minio-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, 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/v2020.12.17/docs/examples/platforms/minio/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-wq9vc 1/1 Running 0 14s
Run following command to view data of
/source/data directory of this pod,
$ kubectl exec -n demo stash-demo-69694789df-wq9vc -- 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.
To cleanup the resources created by this tutorial, run following commands:
$ kubectl delete recovery -n demo minio-recovery $ kubectl delete secret -n demo minio-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