Skip to content

Latest commit

 

History

History
163 lines (131 loc) · 6.13 KB

working-with-velero.md

File metadata and controls

163 lines (131 loc) · 6.13 KB
Raw

Integrate Velero to back up and restore Karmada resources

Velero gives you tools to back up and restore your Kubernetes cluster resources and persistent volumes. You can run Velero with a public cloud platform or on-premises.

Velero lets you:

  • Take backups of your cluster and restore in case of loss.
  • Migrate cluster resources to other clusters.
  • Replicate your production cluster to development and testing clusters.

This document gives an example to demonstrate how to use the Velero to back up and restore Kubernetes cluster resources and persistent volumes. Following example backups resources in cluster member1, and then restores those to cluster member2.

Start up Karamda clusters

You just need to clone Karamda repo, and run the following script in Karamda directory.

hack/local-up-karmada.sh

And then run the below command to switch to the member cluster member1.

export KUBECONFIG=/root/.kube/members.config
kubectl config use-context member1

Install MinIO

Velero uses Object Storage Services from different cloud providers to support backup and snapshot operations. For simplicity, here takes, one object storage that runs locally on k8s clusters, for an example.

Download the binary from the official site:

wget https://dl.min.io/server/minio/release/linux-amd64/minio
chmod +x minio

Run the below command to set MinIO username and password:

export MINIO_ROOT_USER=minio
export MINIO_ROOT_PASSWORD=minio123

Run this command to start MinIO:

./minio server /data --console-address="0.0.0.0:20001" --address="0.0.0.0:9000"

Replace /data with the path to the drive or directory in which you want MinIO to store data. And now we can visit http://{SERVER_EXTERNAL_IP}/20001 in the browser to visit MinIO console UI. And Velero can use http://{SERVER_EXTERNAL_IP}/9000 to connect MinIO. The two configuration will make our follow-up work easier and more convenient.

Please visit MinIO console to create region minio and bucket velero, these will be used by Velero.

For more details about how to install MinIO, please run minio server --help for help, or you can visit MinIO Github Repo.

Install Velero

Velero consists of two components:

  • A command-line client that runs locally.

    1. Download the release tarball for your client platform
    wget https://github.com/vmware-tanzu/velero/releases/download/v1.7.0/velero-v1.7.0-linux-amd64.tar.gz
    1. Extract the tarball:
    tar -zxvf velero-v1.7.0-linux-amd64.tar.gz
    1. Move the extracted velero binary to somewhere in your $PATH (/usr/local/bin for most users).
    cp velero-v1.7.0-linux-amd64/velero /usr/local/bin/

  • A server that runs on your cluster

    We will use velero install to set up server components.

    For more details about how to use MinIO and Velero to backup resources, please ref: https://velero.io/docs/v1.7/contributions/minio/

    1. Create a Velero-specific credentials file (credentials-velero) in your local directory:
    [default]
aws_access_key_id = minio
aws_secret_access_key = minio123

    The two values should keep the same with MinIO username and password that we set when we install MinIO

    1. Start the server.

    We need to install Velero in both member1 and member2, so we should run the below command in shell for both two clusters, this will start Velero server. Please run kubectl config use-context member1 and kubectl config use-context member2 to switch to the different member clusters: member1 or member2.

    velero install \
--provider aws \
--plugins velero/velero-plugin-for-aws:v1.2.1 \
--bucket velero \
--secret-file ./credentials-velero \
--use-volume-snapshots=false \
--backup-location-config region=minio,s3ForcePathStyle="true",s3Url=http://{SERVER_EXTERNAL_IP}:9000

    Replace {SERVER_EXTERNAL_IP} with your own server external IP.

    1. Deploy the nginx application to cluster member1:

    Run the below command in the Karmada directory.

    kubectl apply -f samples/nginx/deployment.yaml

    And then you will find nginx is deployed successfully.

    # kubectl get deployment.apps
NAME    READY   UP-TO-DATE   AVAILABLE   AGE
nginx   2/2     2            2           17s

Back up and restore Karmada resources

Create a backup in member1:

velero backup create nginx-backup --selector app=nginx

Restore the backup in member2

Run this command to switch to member2

export KUBECONFIG=/root/.kube/members.config
kubectl config use-context member2

In member2, we can also get the backup that we created in member1:

# velero backup get
NAME           STATUS      ERRORS   WARNINGS   CREATED                         EXPIRES   STORAGE LOCATION   SELECTOR
nginx-backup   Completed   0        0          2021-12-10 15:16:46 +0800 CST   29d       default            app=nginx

Restore member1 resources to member2:

# velero restore create --from-backup nginx-backup
Restore request "nginx-backup-20211210151807" submitted successfully.

Watch restore result, you'll find that the status is Completed.

# velero restore get
NAME                          BACKUP         STATUS      STARTED                         COMPLETED                       ERRORS   WARNINGS   CREATED                         SELECTOR
nginx-backup-20211210151807   nginx-backup   Completed   2021-12-10 15:18:07 +0800 CST   2021-12-10 15:18:07 +0800 CST   0        0          2021-12-10 15:18:07 +0800 CST   <none>

And then you can find deployment nginx will be restored successfully.

# kubectl get deployment.apps/nginx
NAME    READY   UP-TO-DATE   AVAILABLE   AGE
nginx   2/2     2            2           21s

Reference

The above introductions about Velero and MinIO are only a summary from the official website and repos, for more details please refer to: