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Improve documentation of recovering Longhorn volumes

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Pim Kunis 2024-09-01 16:11:20 +02:00
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@ -62,3 +62,14 @@ To restore a backup, perform the following actions:
2. Enable the "backup-nfs" recurring job for the Longhorn volume. 2. Enable the "backup-nfs" recurring job for the Longhorn volume.
3. Disable the "default" recurring job group for the Longhorn volume. 3. Disable the "default" recurring job group for the Longhorn volume.
4. Create the PV, PVC and workload as usual. 4. Create the PV, PVC and workload as usual.
## Recovering Longhorn volumes without a Kubernetes cluster
1. Navigate to the Longhorn backupstore location (`/mnt/longhorn/persistent/longhorn-backup/backupstore/volumes` for us).
2. Find the directory for the desired volume: `ls **/**`.
3. Determine the last backup for the volume: `cat volume.cfg | jq '.LastBackupName'`.
4. Find the blocks and the order that form the volume: `cat backups/<name>.cfg | jq '.Blocks'`.
5. Extract each block using lz4: `lz4 -d blocks/XX/YY/XXYY.blk block`.
6. Append the blocks to form the file system: `cat block1 block2 block3 > volume.img`
7. Lastly we need to fix the size of the image. We can simply append zero's to the end until the file is long enough so `fsck.ext4` does not complain anymore.
8. Mount the image: `mount -o loop volume.img /mnt/volume`.