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Snapshot

What is Snapshot

A Snapshot is a representation of restic backup snapshot in a Kubernetes native way. With the help of Aggregated API Servers, Stash provides the users a way to view,list and delete snapshots from restic repositories. Now, a user can view some crucial information of snapshots like creationTimestamp, snapshot id, backed up path etc. In future, this will enable the users to recover a particular snapshot using stash.

Snapshot structure

A sample Snapshot object’s structure created by backing up a Deployment is shown below,

apiVersion: repositories.stash.appscode.com/v1alpha1
kind: Snapshot
metadata:
  creationTimestamp: 2018-04-09T06:43:03Z
  labels:
    repository: deployment.stash-demo
    restic: stash-demo
    workload-kind: Deployment
    workload-name: stash-demo
  name: deployment.stash-demo-11156792
  namespace: default
  selfLink: /apis/repositories.stash.appscode.com/v1alpha1/namespaces/default/snapshots/deployment.stash-demo-11156792
  uid: 11156792ffe5a52ef076c4e7c74f79a4e6ad6f8d4d2a8a078cf9ee507a8f360c
status:
  gid: 0
  hostname: stash-demo
  paths:
  - /source/data
  tree: ab2311afd593e5ef6f95df652215c9d1102b1731b72e2784386350ae95f1a145
  uid: 0
  username: ""

Here, we are going to describe some important sections of Snapshot object.

Snapshot Name

name filed in metadata of a Snapshot object represent its name. It follows this pattern, <respective repository crd name>-<first 8 digits of snapshot id>

Snapshot UID

uid field in metadata of Snapshot object represents complete restic snapshot id.

CreationTimestamp

creationTimestamp in metadata field of a Snapshot object represents the time when the snapshot was created.

Snapshot Labels

A Snapshot object maintains some important information using labels. These labels enable a user to filter Snapshot according to repository, restic, workload-kind, workload-name, node-name etc. Details of these labels are given below.

Label name Description
repository Name of the Repository where this Snapshot is stored.
restic Name of the Restic which is responsible for this Snapshot.
workload-kind Kind of the workload for which the Snapshot has been created.
workload-name Name of the workload for which the Snapshot has been created.
pod-name This label present when the respective workload is StatefulSet. It represents the pod name of the StatefulSet who is responsible for this Snapshot.
node-name This label present when the respective workload is DaemonSet. It represents the node name where the DaemonSet is running.

Snapshot Status

Snapshot object has following status fields,

  • status.gid indicates the group identifier of the user who took this backup.
  • status.hostname indicates the name of the host object whose data is backed up in this snapshot. For Deployment,ReplicaSet and ReplicationController it is workload name. For DaemonSet hostname is node name and for StatefulSet hostname is pod name.
  • status.path indicates the path that is backed up in this snapshot.
  • status.tree indicates tree of the restic snapshot. For more details see here.
  • status.uid indicates id of the user who took this backup. For root user it is 0.
  • status.username indicates the name of the user.
  • status.tags indicates tags of the snapshot.

Working with Snapshot

Listing Snapshots:

# List Snapshots of all repositories in the current namespace
$ kubectl get snapshot

# List Snapshots of a particular repository
$ kubectl get snapshot -l repository=deployment.stash-demo

# List all Snapshots of a particular workload type
$ kubectl get snapshot -l workload-kind=Deployment

# List Snapshots of a particular workload
$ kubectl get snapshot -l workload-name=stash-demo

# List all Snapshots created by a particular restic
$ kubectl get snapshot -l restic=stash-demo

# List Snapshots of a particular pod(only for StatefulSet)
$ kubectl get snapshot -l pod-name=stash-demo-0

# List Snapshots of a particular node(only for DaemonSet)
kubectl get snapshot -l node-name=minikube

# List Snapshot of specific repositories
$ kubectl get snapshot -l 'repository in (deployment.stash-demo,statefulset.stash-demo-0)'

Viewing information of a particular Snapshot:

$ kubectl get snapshot <snapshot name> -o yaml

# Example:
$ kubectl get snapshot deployment.stash-demo-3d8cd994 -o yaml
apiVersion: repositories.stash.appscode.com/v1alpha1
kind: Snapshot
metadata:
  creationTimestamp: 2018-04-09T10:06:04Z
  labels:
    repository: deployment.stash-demo
    restic: stash-demo
    workload-kind: Deployment
    workload-name: stash-demo
  name: deployment.stash-demo-3d8cd994
  namespace: default
  selfLink: /apis/repositories.stash.appscode.com/v1alpha1/namespaces/default/snapshots/deployment.stash-demo-3d8cd994
  uid: 3d8cd994a3bddcff1d16ac166601d93454d0eb31e2240801e7c1ec030e5af0bf
status:
  gid: 0
  hostname: stash-demo
  paths:
  - /source/data
  tree: ab2311afd593e5ef6f95df652215c9d1102b1731b72e2784386350ae95f1a145
  uid: 0
  username: ""

Deleting a particular Snapshot:

$ kubectl delete snapshot <snapshot name>

# Example:
$ kubectl delete snapshot statefulset.stash-demo-0-d690726d
snapshot "statefulset.stash-demo-0-d690726d" deleted

Next Steps

  • Learn how to use Stash to backup a Kubernetes deployment here.
  • To restore a backup see here.
  • Learn about the details of Recovery CRD here.
  • To run backup in offline mode see here
  • See the list of supported backends and how to configure them here.
  • See working examples for supported workload types here.
  • Thinking about monitoring your backup operations? Stash works out-of-the-box with Prometheus.
  • Learn about how to configure RBAC roles.
  • Want to hack on Stash? Check our contribution guidelines.

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