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51 lines
2.1 KiB
Markdown
51 lines
2.1 KiB
Markdown
# Kubernetes Volume Snapshots
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It is possible to backup persistent volumes through volume snapshots. This is
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especially handy if you don't want to stop the database to create an [offline
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backup](../neo4j-offline-backup/README.md) thus having a downtime.
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Kubernetes announced this feature in a [blog post](https://kubernetes.io/blog/2018/10/09/introducing-volume-snapshot-alpha-for-kubernetes/). Please make yourself familiar with it before you continue.
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## Create a Volume Snapshot
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There is an example in this folder how you can e.g. create a volume snapshot for
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the persistent volume claim `neo4j-data-claim`:
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```sh
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# in folder deployment/volumes/volume-snapshots/
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kubectl apply -f snapshot.yaml
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```
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If you are on Digital Ocean the volume snapshot should show up in the Web UI:
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## Provision a Volume based on a Snapshot
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Edit your persistent volume claim configuration and add a `dataSource` pointing
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to your volume snapshot. [The blog post](https://kubernetes.io/blog/2018/10/09/introducing-volume-snapshot-alpha-for-kubernetes/) has an example in section "Provision a new volume from a snapshot with
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Kubernetes".
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There is also an example in this folder how the configuration could look like.
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If you apply the configuration new persistent volume claim will be provisioned
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with the data from the volume snapshot:
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```
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# in folder deployment/volumes/volume-snapshots/
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kubectl apply -f neo4j-data.yaml
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```
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## Data Consistency Warning
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Note that volume snapshots do not guarantee data consistency. Quote from the
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[blog post](https://kubernetes.io/blog/2018/10/09/introducing-volume-snapshot-alpha-for-kubernetes/):
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> Please note that the alpha release of Kubernetes Snapshot does not provide
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> any consistency guarantees. You have to prepare your application (pause
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> application, freeze filesystem etc.) before taking the snapshot for data
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> consistency.
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In case of Neo4J this probably means that enterprise edition is required which
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supports [online backups](https://neo4j.com/docs/operations-manual/current/backup/).
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