...
Local Storage using Persistent Volume and Claim
We can use disk space on a node by defining a PersistentVolume (see below) and then making a claim against that volume by specifying the storageclass name in the PersistentVolumeClaim.
- Only one claim can be made against a volume.
- File path (local.path) must exist for the volume to be usable.
| Code Block |
|---|
apiVersion: v1
kind: PersistentVolume
metadata:
name: local-storage
spec:
capacity:
storage: 10Gi
# volumeMode field requires BlockVolume Alpha feature gate to be enabled.
volumeMode: Filesystem
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Persist
storageClassName: local-storage
local:
path: /var/k8s/LOCAL_STORAGE
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- k8sworker1
- k8sworker2
- k8sworker3
- docker-for-desktop
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: local-storage-claim
spec:
storageClassName: local-storage
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 3Gi |
Make our local-storage class the default
kubectl patch storageclass local-storage -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'
Make a claim using the default
| Code Block |
|---|
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: local-storage-claim
spec:
storageClassName: ""
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 3Gi |
Make a claim by specifying the storage class
| Code Block |
|---|
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: local-storage-claim
spec:
storageClassName: local-storage
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 3Gi |
Make any required folders on the worker nodes:
ssh k8sworker1
sudo mkdir -p /var/k8s/LOCAL_STORAGE
Repeat for all nodes requiring local storage.
From master node
...
.
...
Using Default Storage Class with Prebuilt Persistent Volumes
...
| Code Block |
|---|
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: local-storage
annotations:
storageclass.kubernetes.io/is-default-class: "true"
provisioner: keystone/local-storage
volumeBindingMode: Immediate
reclaimPolicy: Retain
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: local-storage-1
spec:
capacity:
storage: 2Gi
volumeMode: Filesystem
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Retain
storageClassName: local-storage
local:
path: /var/pv1
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: NotIn
values:
- master
---
...REPEAT UNTIL HAPPY ... |
To use the default storage of the cluster, you just need to create a claim and specify "" for storageClassName.
| Code Block |
|---|
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: local-storage-claim
spec:
storageClassName: ""
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 3Gi |
GlusterFS
Gluster-kubernetes is a project to provide Kubernetes administrators a mechanism to easily deploy GlusterFS as a native storage service onto an existing Kubernetes cluster.
...