Hello Minikube

Kubernetes 101 also uses minikube so here’s a mixin of both.

Minikube

Installed with pacman

sudo pacman -S minikube kubectl

Create a minikube cluster

minikube start

Open minikube dashboard

minikube dashboard

Create a Deployment

A Deployment is the way to manage Pods

# Run a test container image that includes a webserver
kubectl create deployment hello-node --image=registry.k8s.io/e2e-test-images/agnhost:2.39 -- /agnhost netexec --http-port=8080

View the deployment

kubectl get deployments

View the pod

kubectl get pods

Check up cluster events. Those show the list of steps taken by the deployment.

kubectl get events

View the kubectl configuration

kubectl config view

View application lgos

kubectl logs hello-node-5f76cf6ccf-br9b5

Create a Service

By default a pod is not accessible from outside. A cluster is a closed encapsulated network, like docker. The Pod created in the last steps must be exposed as a k8s service.

# Create the service
kubectl expose deployment hello-node --type=LoadBalancer --port=8080
 
# View the service
kubectl get services
 
# Open the service on the browser
minikube service hello-node

Definitions

Pods

A Kubernetes Pod is a group of one or more Containers, tied together for the purposes of administration and networking. There are two types: Pods that run a single container, Pods that run multiple containers tighly coupled together.

NOTE

Restarting a container in a Pod should not be confused with restarting a Pod. A Pod is not a process, but an environment for running container(s). A Pod persists until it is deleted.

Deployment

It’s a declarative update of a set of Pods or ReplicaSets. You declare the desired state in a deployment file and a Controller takes care of making that state happen.

Cleanup

kubectl delete service hello-node
kubectl delete deployment hello-node
# Optional
minikube delete

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Sources

https://kubernetes.io/docs/tutorials/hello-minikube/ https://minikube.sigs.k8s.io/docs/tutorials/kubernetes_101