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Local Backend
Local backend refers to a local path inside stash sidecar container. Any Kubernetes supported persistent volume such as PersistentVolumeClaim, HostPath, EmptyDir (for testing only), NFS, gcePersistentDisk etc. can be used as local backend.
In order to use Kubernetes volumes as backend, you have to create a Secret and a Repository object pointing to the desired volume.
Create Storage Secret
To configure storage secret for local backend, following secret keys are needed:
| Key | Type | Description |
|---|---|---|
RESTIC_PASSWORD | Required | Password that will be used to encrypt the backup snapshots |
Create storage secret as below,
$ echo -n 'changeit' > RESTIC_PASSWORD
$ kubectl create secret generic -n demo local-secret --from-file=./RESTIC_PASSWORD
secret/local-secret created
Create Repository
Now, you have to create a Repository crd that uses Kubernetes volume as a backend. You have to provide the storage secret that we have created earlier in spec.backend.storageSecretName field.
Following parameters are available for Local backend.
| Parameter | Type | Description |
|---|---|---|
local.mountPath | Required | Path where this volume will be mounted inside the sidecar container. Example: /safe/data.We have put stash binary in the root directory. Hence, you can not use /stash or /stash/* as local.mountPath |
local.subPath | Optional | Sub-path inside the referenced volume where the backed up snapshot will be stored instead of its root. |
local.VolumeSource | Required | Any Kubernetes volume. Can be specified inlined. Example: hostPath. |
Here, we are going to show some sample Repository crds that uses different Kubernetes volume as a backend.
HostPath volume as Backend
Below, the YAML of a sample Repository crd that uses a hostPath volume as a backend.
apiVersion: stash.appscode.com/v1alpha1
kind: Repository
metadata:
name: local-repo-with-hostpath
namespace: demo
spec:
backend:
local:
mountPath: /safe/data
hostPath:
path: /data/stash-test/repo
storageSecretName: local-secret
Create the Repository we have shown above using the following command,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2023.10.9/docs/guides/backends/local/examples/hostPath.yaml
repository/local-repo-with-hostpath created
Note that by default, Stash runs as
non-rootuser.hostPathvolume is writable only forrootuser. So, in order to usehostPathvolume as backend, either you have to run Stash asrootuser using securityContext or you have to change the permission of thehostPathto make it writable fornon-rootusers.
PersistentVolumeClaim as Backend
Below, the YAML of a sample Repository crd that uses a PersistentVolumeClaim as a backend.
apiVersion: stash.appscode.com/v1alpha1
kind: Repository
metadata:
name: local-repo-with-pvc
namespace: demo
spec:
backend:
local:
mountPath: /safe/data
persistentVolumeClaim:
claimName: repo-pvc
storageSecretName: local-secret
Create the Repository we have shown above using the following command,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2023.10.9/docs/guides/backends/local/examples/pvc.yaml
repository/local-repo-with-pvc created
NFS volume as Backend
Below, the YAML of a sample Repository crd that uses an NFS volume as a backend.
apiVersion: stash.appscode.com/v1alpha1
kind: Repository
metadata:
name: local-repo-with-nfs
namespace: demo
spec:
backend:
local:
mountPath: /safe/data
nfs:
server: "nfs-service.storage.svc.cluster.local" # use you own NFS server address
path: "/" # this path is relative to "/exports" path of NFS server
storageSecretName: local-secret
Create the Repository we have shown above using the following command,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2023.10.9/docs/guides/backends/local/examples/nfs.yaml
repository/local-repo-with-nfs created
For NFS backend, Stash may have to run the network volume accessor deployments in privileged mode to provide Snapshot listing facility. In this case, please configure network volume accessors by following the instruction here.
GCE PersitentDisk as Backend
Below, the YAML of a sample Repository crd that uses a gcePersistentDisk as a backend.
apiVersion: stash.appscode.com/v1alpha1
kind: Repository
metadata:
name: local-repo-with-gcepersistentdisk
namespace: demo
spec:
backend:
local:
mountPath: /safe/data
gcePersistentDisk:
pdName: stash-repo
fsType: ext4
storageSecretName: local-secret
Create the Repository we have shown above using the following command,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2023.10.9/docs/guides/backends/local/examples/gcePersistentDisk.yaml
repository/local-repo-with-gcepersistentdisk created
In order to use
gcePersistentDiskvolume as backend, the node where stash container is running must be a GCE VM and the VM must be in same GCE project and zone as the Persistent Disk.
AWS EBS volume as Backend
Below, the YAML of a sample Repository crd that uses an awsElasticBlockStore as a backend.
apiVersion: stash.appscode.com/v1alpha1
kind: Repository
metadata:
name: local-repo-with-awsebs
namespace: demo
spec:
backend:
local:
mountPath: /safe/data
awsElasticBlockStore: # This AWS EBS volume must already exist.
volumeID: <volume-id>
fsType: ext4
storageSecretName: local-secret
Create the Repository we have shown above using the following command,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2023.10.9/docs/guides/backends/local/examples/awsElasticBlockStore.yaml
repository/local-repo-with-awsebs created
In order to use
awsElasticBlockStorevolume as backend, the pod where stash container is running must be running on an AWS EC2 instance and the instance must be in the same region and availability-zone as the EBS volume.
Azure Disk as Backend
Below, the YAML of a sample Repository crd that uses an azureDisk as a backend.
apiVersion: stash.appscode.com/v1alpha1
kind: Repository
metadata:
name: local-repo-with-azuredisk
namespace: demo
spec:
backend:
local:
mountPath: /safe/data
azureDisk:
diskName: stash.vhd
diskURI: https://someaccount.blob.microsoft.net/vhds/stash.vhd
storageSecretName: local-secret
Create the Repository we have shown above using the following command,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2023.10.9/docs/guides/backends/local/examples/azureDisk.yaml
repository/local-repo-with-azuredisk created
StorageOS as Backend
Below, the YAML of a sample Repository crd that uses a storageOS volume as a backend.
apiVersion: stash.appscode.com/v1alpha1
kind: Repository
metadata:
name: local-repo-with-storageos
namespace: demo
spec:
backend:
local:
mountPath: /safe/data
storageos:
volumeName: stash-vol01 # The `stash-vol01` volume must already exist within StorageOS in the `demo` namespace.
fsType: ext4
storageSecretName: local-secret
Create the Repository we have shown above using the following command,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2023.10.9/docs/guides/backends/local/examples/storageOS.yaml
repository/local-repo-with-storageos created
EmptyDir volume as Backend
Below, the YAML of a sample Repository crd that uses an emptyDir as a backend.
apiVersion: stash.appscode.com/v1alpha1
kind: Repository
metadata:
name: local-repo-with-emptydir
namespace: demo
spec:
backend:
local:
mountPath: /safe/data
emptyDir: {}
storageSecretName: local-secret
Create the Repository we have shown above using the following command,
$ kubectl apply -f https://github.com/stashed/docs/raw/v2023.10.9/docs/guides/backends/local/examples/emptyDir.yaml
repository/local-repo-with-emptydir created
Warning: Data of an
emptyDirvolume is not persistent. If you delete the pod that runs the respective stash container, you will lose all the backed up data. You should use this kind of volumes only to test backup process.