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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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docs/longhorn.md
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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.
3. Disable the "default" recurring job group for the Longhorn volume.
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`.