OpenEBS#
This tutorial covers the installation of OpenEBS as a Helm extension. OpenEBS can be installed as a helm chart by adding it as an extension to your configuration:
extensions:
helm:
repositories:
- name: openebs-internal
url: https://openebs.github.io/charts
charts:
- name: openebs
chartname: openebs-internal/openebs
version: "3.9.0"
namespace: openebs
order: 1
values: |
localprovisioner:
hostpathClass:
enabled: true
isDefaultClass: false
If you want OpenEBS to be your default storage class, set isDefaultClass
to true
.
Usage#
Once installed, the cluster will have two storage classes available for you to use:
k0s kubectl get storageclass
NAME PROVISIONER RECLAIMPOLICY VOLUMEBINDINGMODE ALLOWVOLUMEEXPANSION AGE
openebs-device openebs.io/local Delete WaitForFirstConsumer false 24s
openebs-hostpath openebs.io/local Delete WaitForFirstConsumer false 24s
The openebs-hostpath
is the storage class that maps to /var/openebs/local
.
The openebs-device
is not configured and could be configured by manifest deployer accordingly to the OpenEBS documentation
Example#
Use following manifests as an example of pod with mounted volume:
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: nginx-pvc
namespace: default
spec:
accessModes:
- ReadWriteOnce
storageClassName: openebs-hostpath
resources:
requests:
storage: 5Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
namespace: default
labels:
app: nginx
spec:
selector:
matchLabels:
app: nginx
strategy:
type: Recreate
template:
metadata:
labels:
app: nginx
spec:
containers:
- image: nginx
name: nginx
volumeMounts:
- name: persistent-storage
mountPath: /var/lib/nginx
volumes:
- name: persistent-storage
persistentVolumeClaim:
claimName: nginx-pvc
k0s kubectl apply -f nginx.yaml
persistentvolumeclaim/nginx-pvc created
deployment.apps/nginx created
bash-5.1# k0s kc get pods
NAME READY STATUS RESTARTS AGE
nginx-d95bcb7db-gzsdt 1/1 Running 0 30s
k0s kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pvc-9a7fae2d-eb03-42c3-aaa9-1a807d5df12f 5Gi RWO Delete Bound default/nginx-pvc openebs-hostpath 30s