Cloud-Native Storage for Kubernetes

Cloud-Native Storage for Kubernetes

Multitude of options

There are multitude of options both free and paid. I’ll consider only the free ones.

Paid ones are: Portworx, StorageOS, Robin.io

Source:

Undestand the basics

If we don’t have storage installed, the pods will be in constant “pending” state.

To check if we have the default storage class:

kubectl get storageclass
Set default StorageClass

If not specified in manifest, cluster can use default storageclass. As nothing is normally set as default, we do it by adding some metadata:

# Make `openebs-standalone` the default
kubectl patch storageclass openebs-standalone -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

Source: Change the default StorageClass

A PersistentVolume can be mounted on a host in any way supported by the resource provider.

accessModes:

  • ReadWriteOnce – the volume can be mounted as read-write by a single node
  • ReadOnlyMany – the volume can be mounted read-only by many nodes
  • ReadWriteMany – the volume can be mounted as read-write by many nodes

We can use hostpath but that is bound to one node.

Deploy OpenEBS

kubectl apply -f https://raw.githubusercontent.com/openebs/openebs/master/k8s/openebs-operator.yaml
kubectl apply -f https://raw.githubusercontent.com/openebs/openebs/master/k8s/openebs-storageclasses.yaml

Kubernetes Persistent Volumes with Deployment and StatefulSet


OpenEBS or Hetzner-CSI?

What? Currently looking at that rook.io because I need a “readwriteMany” PVC (A Webroot where multiple PODs need access to) and OpenEBS does not support multiple pods using the same PVC.

date 01. Jan 0001 | modified 28. May 2021
filename: Kubernetes » Storage