Openebs

OpenEBS

https://openebs.io/docs/concepts/casengines

Mayastor snaps https://github.com/openebs/mayastor/issues/1064

Ubuntu Microk8s

• https://docs.openebs.io/docs/next/prerequisites.html#ubuntu
• https://microk8s.io/docs/addon-openebs

sudo systemctl status iscsid
# sudo systemctl enable --now iscsid
sudo systemctl status iscsid | grep inactive && sudo systemctl enable --now iscsid
sudo microk8s dns ingress rbac openebs
watch sudo microk8s kubectl get pod -n openebs
kubectl patch storageclass openebs-jiva-default -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
kubectl patch storageclass microk8s-hostpath -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'

nginx-claim-pod-jiva.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nginx-pv-volume
  labels:
    type: local
spec:
  storageClassName: openebs-jiva-default
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nginx-pv-claim
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi
---
apiVersion: v1
kind: Pod
metadata:
  name: nginx-pv-pod
spec:
  volumes:
    - name: nginx-pv-storage
      persistentVolumeClaim:
        claimName: nginx-pv-claim
  containers:
    - name: nginx-pv-container
      image: nginx
      ports:
        - containerPort: 80
          name: "http-server"
      volumeMounts:
        - mountPath: "/usr/share/nginx/html"
          name: nginx-pv-storage

k exec -it nginx-pv-pod -- bash -c "echo 'hello there' > /usr/share/nginx/html/index.html"

deployment-claim-example.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
 name: busybox
 labels:
   app: busybox
spec:
 replicas: 2
 strategy:
   type: RollingUpdate
 selector:
   matchLabels:
     app: busybox
 template:
   metadata:
     labels:
       app: busybox
   spec:
     containers:
     - resources:
          limits:
           cpu: 0.5
       name: busybox
       image: busybox
       command: ['sh', '-c', 'echo Container 1 is Running ; sleep 3600']
       imagePullPolicy: IfNotPresent
       ports:
        - containerPort: 3306
          name: busybox
       volumeMounts:
       - mountPath: /var/lib/mysql
         name: demo-vol1
     volumes:
      - name: demo-vol1
        persistentVolumeClaim:
         claimName: busk-claim-jiva
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
 name: busk-claim-jiva
spec:
 storageClassName: openebs-jiva-default
 accessModes:
   - ReadWriteOnce
 resources:
   requests:
     storage: 5G
---
apiVersion: v1
kind: Service
metadata:
 name: busybox-mysql
 labels:
   name: busybox-mysql
spec:
 ports:
   - port: 3306
     targetPort: 3306
 selector:
     name: busybox

An example of creating a PersistentVolumeClaim utilizing the openebs-hostpath StorageClass


kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: local-hostpath-pvc
spec:
  storageClassName: openebs-hostpath
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5G



-----------------------

If you are planning to use OpenEBS with multi nodes, you can use the openebs-jiva-default StorageClass.
An example of creating a PersistentVolumeClaim utilizing the openebs-jiva-default StorageClass


kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: jiva-volume-claim
spec:
  storageClassName: openebs-jiva-default
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5G

• https://docs.openebs.io/docs/next/faq.html
• https://microk8s.io/docs/addon-openebs
• https://docs.openebs.io/v110/docs/next/jivaguide.html
• https://docs.openebs.io/#:~:text=OpenEBS%20creates%20a%20Micro%2Dservice,%2D%20Mayastor%2C%20cStor%20or%20Jiva.&text=When%20the%20node%20running%20the,data%20copies%20on%20other%20nodes.
• https://docs.openebs.io/docs/next/ugndm.html
• https://www.portainer.io/blog/portainer-on-microk8s-openebs-metallb-and-ingress
• https://docs.openebs.io/docs/next/jivaguide.html#create-a-pool

Example

• https://docs.openebs.io/docs/next/jivaguide.html
• https://openebs.io/blog/provisioning-openebs-jiva-volumes-via-csi/

Troubleshooting

• https://docs.openebs.io/v190/docs/next/prerequisites.html#ubuntu

kubectl get events -A --field-selector=reason=OwnerRefInvalidNamespace --all-namespaces
NAMESPACE   LAST SEEN   TYPE      REASON                     OBJECT                                                          MESSAGE
default     27m         Warning   OwnerRefInvalidNamespace   validatingwebhookconfiguration/openebs-validation-webhook-cfg   ownerRef [apps/v1/Deployment, namespace: , name: openebs-admission-server, uid: b0a7a9bd-943a-4bc9-a58c-8addef4b6066] does not exist in namespace ""

kubectl get validatingwebhookconfiguration

Trash

https://docs.openebs.io/v190/docs/next/troubleshooting.html

kubectl get events -A --field-selector=reason=OwnerRefInvalidNamespace --all-namespaces

default 88s Warning OwnerRefInvalidNamespace validatingwebhookconfiguration/openebs-validation-webhook-cfg ownerRef [apps/v1/Deployment, namespace: , name: openebs-admission-server, uid: 6dd64c9a-84a4-4b88-aac6-e5a62865302e] does not exist in namespace ""

kubectl -n openebs get pods -o name | grep admission-server | xargs kubectl -n openebs delete

Uninstall or Delete

helm uninstall --namespace openebs openebs

Ref

• https://github.com/openebs/openebs/blob/master/k8s/upgrades/README.md