Recover from a Longhorn Backup without System Installed

This command gives users the ability to restore a backup to a raw image or a qcow2 image. If the backup is based on a backing file, users should provide the backing file as a qcow2 image with --backing file parameter.

Instruction

1. Copy the yaml template: Make a copy of examples/restore_to_file.yaml.template as e.g. restore.yaml.

2. Set the node which the output file should be placed on by replacing <NODE_NAME>, e.g. node1.

3. Specify the host path of output file by modifying field hostpath of volume disk-directory. By default the directory is /tmp/restore/.

4. Set the first argument (backup url) by replacing <BACKUP_URL>, e.g. s3://backupbucket@us-east-1/backupstore?backup=backup-bd326da2c4414b02&volume=volumeexamplename. Do not delete ''.

5. Set argument output-file by replacing <OUTPUT_FILE>, e.g. volume.raw or volume.qcow2.

6. Set argument output-format by replacing <OUTPUT_FORMAT>. Now support raw or qcow2 only.

7. Set S3 Credential Secret by replacing <S3_SECRET_NAME>, e.g. minio-secret.

8. Execute the yaml using e.g. kubectl create -f restore.yaml.

9. Watching the result using kubectl -n longhorn-system get pod restore-to-file -w

After the pod status changed to Completed, you should able to find <OUTPUT_FILE> at e.g. /tmp/restore on the <NODE_NAME>.