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05_Minikube_on_Podman.md

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Kubernetes (Minikube) on Podman

The fastest way to start is to run this command:

minikube start --driver podman
😄  minikube v1.26.0 on Darwin 12.4 (arm64)
✨  Using the podman (experimental) driver based on existing profile
👍  Starting control plane node minikube in cluster minikube
🚜  Pulling base image ...
E0725 11:41:01.134112   18512 cache.go:203] Error downloading kic artifacts:  not yet implemented, see issue #8426
🔄  Restarting existing podman container for "minikube" ...
🐳  Preparing Kubernetes v1.24.1 on Docker 20.10.17 ...E0725 11:41:07.641968   18512 start.go:126] Unable to get host IP: RoutableHostIPFromInside is currently only implemented for linux

🔎  Verifying Kubernetes components...
    ▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
🌟  Enabled addons: storage-provisioner, default-storageclass
🏄  Done! kubectl is now configured to use "minikube" cluster and "default" namespace by default

Test: Migrate the pod from Podman to Kubernetes

Let's just export the running pod (if you don't have one, check Chapter 3 and go through it).

We will need a persisten volume claim. Note that the generator does not create other resources like PersistentVolumeClaims, so in case of needing one we will have to create it explicitly.

podman generate kube dynamic-webserver | kubectl apply -f -
pod/dynamic-webserver created

# The Pod won't be ready until the PVC is created:

kubectl get pod dynamic-webserver
NAME                READY   STATUS    RESTARTS   AGE
dynamic-webserver   0/2     Pending   0          6m2s

Create the Persistent Volume Claim

Let's create the PVC using an inline script like the following one.

Including the storage class as "standard" should allow minikube to provision a PersistenVolume automatically, so there is no need for explicitly provisioning a volume.

echo "
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: webserver-data
spec:
  accessModes:
    - ReadWriteMany
  storageClassName: standard
  resources:
    requests:
      storage: 1Gi
" | kubectl apply -f -
persistentvolumeclaim/webserver-data created004l

kubectl get pvc webserver-data
NAME             STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
webserver-data   Bound    pvc-018de289-0506-49fb-a95c-8eaa17040cd8   1Gi        RWX            standard       5m57s

kubectl describe pvc webserver-data
Name:          webserver-data
Namespace:     default
StorageClass:  standard
Status:        Bound
Volume:        pvc-018de289-0506-49fb-a95c-8eaa17040cd8
Labels:        <none>
Annotations:   pv.kubernetes.io/bind-completed: yes
               pv.kubernetes.io/bound-by-controller: yes
               volume.beta.kubernetes.io/storage-provisioner: k8s.io/minikube-hostpath
               volume.kubernetes.io/storage-provisioner: k8s.io/minikube-hostpath
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      1Gi
Access Modes:  RWX
VolumeMode:    Filesystem
Used By:       dynamic-webserver
Events:
  Type    Reason                 Age                  From                                                                    Message
  ----    ------                 ----                 ----                                                                    -------
  Normal  Provisioning           6m1s                 k8s.io/minikube-hostpath_minikube_79f7c9e9-5132-4133-acf8-f4ea456da720  External provisioner is provisioning volume for claim "default/webserver-data"
  Normal  ExternalProvisioning   6m1s (x2 over 6m1s)  persistentvolume-controller                                             waiting for a volume to be created, either by external provisioner "k8s.io/minikube-hostpath" or manually created by system administrator
  Normal  ProvisioningSucceeded  6m1s                 k8s.io/minikube-hostpath_minikube_79f7c9e9-5132-4133-acf8-f4ea456da720  Successfully provisioned volume pvc-018de289-0506-49fb-a95c-8eaa17040cd8

kubectl get pod dynamic-webserver
NAME                READY   STATUS    RESTARTS   AGE
dynamic-webserver   2/2     Running   0          29m

Forwarding Requests to the Pod

As we haven't yet provided a Service to the Kubernetes' Pod, we cannot forward requests to the services.

To test the pods working together we will use the port forwarding functinality built-in in kubectl. Note that the target port is "80" and not "8080" as in the previous examples. For consistency we will map port 80 to 8080 on the local machine:

# Stop the Pod if you still have it running, it might be using port 8080
podman pod ps | grep dynamic-webserver || podman pod stop dynamic-webserver
80c71a708a8e  dynamic-webserver  Exited      2 hours ago  41194441e148  4

Run this on a shell, this process blocks the output and it is not suitable for the Jupyter Notebook

kubectl port-forward pods/dynamic-webserver 8080:80

curl localhost:8080
Static Website Init
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