Kubernetes Daily Task Aug 10 Turn on CSI!

As you might have guessed we eventually will be playing around with Kasten. So we need to turn on the CSI hostpath driver and snapshotting in Minikube. 

We will first take a look at all of the addons available:

minikube addons list

Now we will enable the two ones that we need;

minikube addons enable csi-hostpath-driver 

and then

minikube addons enable volumesnapshots 

and

The CSI local hostpath dirver will allow us to dynamically allocate storage. We need to change the default storage class to the hostpath driver.

First we can check if it is installed:

kubectl get sc

First lets take off the default storage class status for standard, make sure that you are in bash (type bash)

kubectl patch storageclass standard -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'

and now make the csi-hostpath-sc the default

kubectl patch storageclass csi-hostpath-sc -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

Now lets test this out to make sure we can grab storage with a small nginx setup:

Create the namespace

kubectl create ns nginx

Now copy and paste the following:

cat <<EOF | kubectl apply -f -

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: nginxpvcclaim
  namespace: nginx
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
---
kind: Pod
apiVersion: v1
metadata:
  name: nginxwebsite
  namespace: nginx
  labels: 
    run: nginx
spec:
  volumes:
    - name: storage
      persistentVolumeClaim:
       claimName: nginxpvcclaim
  containers:
    - name: nginxwebsite
      image: nginx
      ports:
        - containerPort: 80
          name: "http-server"
      volumeMounts:
        - mountPath: "/usr/share/nginx/html"
          name: storage
EOF

Wait until the pod is running:

kubectl get pods -n nginx

If it is running then it probably got the storage that it needed :)

We can check that with a 

kubectl get pvc -n nginx

The pvc is in a bound state which means that it is good

That is it for today. We have storage that we can automatically allocate and we also have the snapshotter ready for some Kasten fun in the future!