Hello Minikube for ppc64le

This tutorial shows you how to create a cluster for processors of the Power architecture (ppc64/ppc64le) using Minikube.

The tutorial was performed on Ubuntu 20.04 LTS (ppc64le), the packages were downloaded using the package repository from OpenPower Lab @ Unicamp.

Dependencies

The following packages are required:

• Minikube
• Kubectl
• Docker-ce
• Conntrack

You can use the commands below to solve the dependencies:

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apt-get update
apt-get install docker-ce conntrack minikube kubectl

It may be necessary to add the repository from OpenPower Lab @ Unicamp in your sistems.

Optionally, Kubeadm and Kubelet can be installed.

Create a minikube cluster

1. Start Minikube

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sudo minikube start --driver=none

The default drive is Docker, however the minikube does not recognize that Docker is available for ppc64le architecture and has an error.

To make ’none’ the default drive, use the command:

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sudo minikube config set driver none

You may need to run the command:: sudo sysctl fs.protected_regular=0

2. Check Status

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sudo minikube status

Output is similar to:

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minikube
type: Control Plane
host: Running
kubelet: Running
apiserver: Running
kubeconfig: Configured

3. Open the Kubernetes dashboard in a browser

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sudo minikube dashboard

Create a Deployment

There are two structures in Kubernetes: Pod and Deployment. Pod can be a group of one or more containers, while a Deployment checks, manages and restarts the pods. That is, the deployment is recommended when it will be used in a large group of pods.

1. Create a Deployment

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sudo kubectl create deployment hello-node --image=minicloud/node-server

minicloud/node-server: is a public docker image created for the ppc64le architecture. The files used to build the image are in the GitHub.

2. View the Deployment:

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sudo kubectl get deployments

The output is similar to:

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NAME         READY   UP-TO-DATE   AVAILABLE   AGE
hello-node   1/1     1            1           6m28s

3. View the Pod:

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sudo kubectl get pods

The output is similar to:

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NAME                          READY   STATUS    RESTARTS   AGE
hello-node-5dd47b76c8-l5vs2   1/1     Running   0          6m51s

Create a Service

In order to be able to directly access the Pod, it is necessary to create a service.

1. Create a Service

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sudo kubectl expose deployment hello-node --type=NodePort --port=8080

2. View the Service

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sudo kubectl get services

The output is similar to:

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NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
hello-node   NodePort    10.102.223.224   <none>        8080:31253/TCP   8s
kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP          14m

Open the service in the browser: http://localhost:8080/.

If it is not possible to access this port, change the 8080, for the 5 digit port that appears in the view. In that case it would be port 31253.

Clean up

Now you can clean up the resources you created in your cluster:

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kubectl delete service hello-node
kubectl delete deployment hello-node

Optionally, stop the Minikube:

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minikube stop

Optionally, delete the Minikube:

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minikube delete

Tutorial for others architectures

Hello Minikube