This tutorial shows you how to run a simple Hello World Node.js app on Kubernetes using Minikube and Katacoda. Katacoda provides a free, in-browser Kubernetes environment.
Note: You can also follow this tutorial if you’ve installed Minikube locally.
This tutorial provides a container image built from the following files:
For more information on the
docker build command, read the Docker documentation.
Click Launch Terminal
Note: If you installed Minikube locally, run
Open the Kubernetes dashboard in a browser:
Katacoda environment only: At the top of the terminal pane, click the plus sign, and then click Select port to view on Host 1.
Katacoda environment only: Type
30000, and then click Display Port.
A Kubernetes Pod is a group of one or more Containers, tied together for the purposes of administration and networking. The Pod in this tutorial has only one Container. A Kubernetes Deployment checks on the health of your Pod and restarts the Pod’s Container if it terminates. Deployments are the recommended way to manage the creation and scaling of Pods.
kubectl create command to create a Deployment that manages a Pod. The
Pod runs a Container based on the provided Docker image.
kubectl create deployment hello-node --image=gcr.io/hello-minikube-zero-install/hello-node
View the Deployment:
kubectl get deployments
NAME READY UP-TO-DATE AVAILABLE AGE hello-node 1/1 1 1 1m
View the Pod:
kubectl get pods
NAME READY STATUS RESTARTS AGE hello-node-5f76cf6ccf-br9b5 1/1 Running 0 1m
View cluster events:
kubectl get events
kubectl config view
Note: For more information about
kubectlcommands, see the kubectl overview.
By default, the Pod is only accessible by its internal IP address within the
Kubernetes cluster. To make the
hello-node Container accessible from outside the
Kubernetes virtual network, you have to expose the Pod as a
Expose the Pod to the public internet using the
kubectl expose command:
kubectl expose deployment hello-node --type=LoadBalancer --port=8080
--type=LoadBalancer flag indicates that you want to expose your Service
outside of the cluster.
View the Service you just created:
kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE hello-node LoadBalancer 10.108.144.78 <pending> 8080:30369/TCP 21s kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 23m
On cloud providers that support load balancers,
an external IP address would be provisioned to access the Service. On Minikube,
LoadBalancer type makes the Service accessible through the
Run the following command:
minikube service hello-node
Katacoda environment only: Click the plus sign, and then click Select port to view on Host 1.
Katacoda environment only: Note the 5 digit port number displayed opposite to
8080 in services output. This port number is randomly generated and it can be different for you. Type
30369 in the port number text box, then click Display Port.
This opens up a browser window that serves your app and shows the “Hello World” message.
Minikube has a set of built-in addons that can be enabled, disabled and opened in the local Kubernetes environment.
List the currently supported addons:
minikube addons list
addon-manager: enabled coredns: disabled dashboard: enabled default-storageclass: enabled efk: disabled freshpod: disabled heapster: disabled ingress: disabled kube-dns: enabled metrics-server: disabled nvidia-driver-installer: disabled nvidia-gpu-device-plugin: disabled registry: disabled registry-creds: disabled storage-provisioner: enabled
Enable an addon, for example,
minikube addons enable heapster
heapster was successfully enabled
View the Pod and Service you just created:
kubectl get pod,svc -n kube-system
NAME READY STATUS RESTARTS AGE pod/heapster-9jttx 1/1 Running 0 26s pod/influxdb-grafana-b29w8 2/2 Running 0 26s pod/kube-addon-manager-minikube 1/1 Running 0 34m pod/kube-dns-6dcb57bcc8-gv7mw 3/3 Running 0 34m pod/kubernetes-dashboard-5498ccf677-cgspw 1/1 Running 0 34m pod/storage-provisioner 1/1 Running 0 34m NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/heapster ClusterIP 10.96.241.45 <none> 80/TCP 26s service/kube-dns ClusterIP 10.96.0.10 <none> 53/UDP,53/TCP 34m service/kubernetes-dashboard NodePort 10.109.29.1 <none> 80:30000/TCP 34m service/monitoring-grafana NodePort 10.99.24.54 <none> 80:30002/TCP 26s service/monitoring-influxdb ClusterIP 10.111.169.94 <none> 8083/TCP,8086/TCP 26s
minikube addons disable heapster
heapster was successfully disabled
Now you can clean up the resources you created in your cluster:
kubectl delete service hello-node kubectl delete deployment hello-node
Optionally, stop the Minikube virtual machine (VM):
Optionally, delete the Minikube VM:
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