K
Q

how to create storageclass on a baremetal kubernetes cluster

5/19/2020

I am trying to deploy an app that for some reason won't deploy except if persistence is enabled https://github.com/dgraph-io/dgraph/blob/master/contrib/config/kubernetes/dgraph-ha/dgraph-ha.yaml

you can test this out with above yaml and try to install on a baremetal k8s cluster and it won't work

$ kubectl get pod --namespace dgraph

dgraph-alpha-0                      0/1     Pending     0          112s
dgraph-ratel-7459974489-ggnql       1/1     Running     0          112s
dgraph-zero-0                       0/1     Pending     0          112s


$ kubectl describe pod/dgraph-alpha-0 --namespace dgraph

...
...
...
Events:
  Type     Reason            Age        From               Message
  ----     ------            ----       ----               -------
  Warning  FailedScheduling  <unknown>  default-scheduler  error while running "VolumeBinding" filter plugin for pod "dgraph-alpha-0": pod has unbound immediate PersistentVolumeClaims
  Warning  FailedScheduling  <unknown>  default-scheduler  error while running "VolumeBinding" filter plugin for pod "dgraph-alpha-0": pod has unbound immediate PersistentVolumeClaims

anyone ever had this problem? it is been a problem for several days now and not sure a way around this. How can i have the app use the local storage of the cluster?

thanks

-- uberrebu
dgraph
kubectl
kubernetes
yaml

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1 Answer

5/20/2020

found a/the solution i pretty much have to manually create the pv and pvc and then the app uses the already created pv and pvc during deployment

here is yaml to create storageclass, pv and pvc

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: local
  annotations:
    storageclass.kubernetes.io/is-default-class: "true"
provisioner: kubernetes.io/no-provisioner
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: datadir-dgraph-dgraph-alpha-0
  labels:
    type: local
spec:
  storageClassName: local
  capacity:
    storage: 8Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/dgraph/alpha-0"
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: datadir-dgraph-dgraph-alpha-1
  labels:
    type: local
spec:
  storageClassName: local
  capacity:
    storage: 8Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/dgraph/alpha-1"
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: datadir-dgraph-dgraph-alpha-2
  labels:
    type: local
spec:
  storageClassName: local
  capacity:
    storage: 8Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/dgraph/alpha-2"
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: datadir-dgraph-dgraph-zero-0
  labels:
    type: local
spec:
  storageClassName: local
  capacity:
    storage: 8Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/dgraph/zero-0"
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: datadir-dgraph-dgraph-zero-1
  labels:
    type: local
spec:
  storageClassName: local
  capacity:
    storage: 8Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/dgraph/zero-1"
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: datadir-dgraph-dgraph-zero-2
  labels:
    type: local
spec:
  storageClassName: local
  capacity:
    storage: 8Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/dgraph/zero-2"


---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: datadir-dgraph-dgraph-alpha-0
spec:
  storageClassName: local
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 8Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: datadir-dgraph-dgraph-alpha-1
spec:
  storageClassName: local
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 8Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: datadir-dgraph-dgraph-alpha-2
spec:
  storageClassName: local
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 8Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: datadir-dgraph-dgraph-zero-0
spec:
  storageClassName: local
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 8Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: datadir-dgraph-dgraph-zero-1
spec:
  storageClassName: local
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 8Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: datadir-dgraph-dgraph-zero-2
spec:
  storageClassName: local
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 8Gi

now when app deployed now..it latches on to the pvc

$ kubectl get pvc -n dgraph -o wide
NAME                            STATUS   VOLUME                          CAPACITY   ACCESS MODES   STORAGECLASS   AGE     VOLUMEMODE
datadir-dgraph-dgraph-alpha-0   Bound    datadir-dgraph-dgraph-zero-2    8Gi        RWO            local          6h40m   Filesystem
datadir-dgraph-dgraph-alpha-1   Bound    datadir-dgraph-dgraph-alpha-0   8Gi        RWO            local          6h40m   Filesystem
datadir-dgraph-dgraph-alpha-2   Bound    datadir-dgraph-dgraph-zero-0    8Gi        RWO            local          6h40m   Filesystem
datadir-dgraph-dgraph-zero-0    Bound    datadir-dgraph-dgraph-alpha-1   8Gi        RWO            local          6h40m   Filesystem
datadir-dgraph-dgraph-zero-1    Bound    datadir-dgraph-dgraph-alpha-2   8Gi        RWO            local          6h40m   Filesystem
datadir-dgraph-dgraph-zero-2    Bound    datadir-dgraph-dgraph-zero-1    8Gi        RWO            local          6h40m   Filesystem
-- uberrebu
Source: StackOverflow