DevOps / Kubernetes

How to access applications deployed in minikube Kubernetes cluster using NodePort

minikube is the most simple way to spin-up and use a Kubernetes cluster for your quick needs. You can install and use minikube clusters on Linux, Windows and Mac workstations without much knowledge about setting up a Kubernetes cluster. minikube will create a single VM cluster (by default) and you can adjust CPU and memory resources if you need more capacity for your Kubernetes cluster. 

Check how to build a minikube cluster using vagrant and virtualbox.

If you have issues with virtualization (if virtualization is not enabled on workstation), you can use docker based minikube as well; refer documentation for more details.

minikube start --driver=docker

In this demo, we will deploy a simple nginx application using helm charts and access it from the host machine.

Deploy nginx application

We will use helm charts from bitnami to quickly deploy the application as our intention to show how to access the application. You can use the standard application deployment (deploy app, expose service etc.)

Add helm repo

$ helm repo add bitnami https://charts.bitnami.com/bitnami

Install nginx web server using helm chart

$ helm install nginx-web-server bitnami/nginx
NAME: nginx-web-server
LAST DEPLOYED: Sat Jan 29 12:14:33 2022
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
CHART NAME: nginx
CHART VERSION: 9.7.5
APP VERSION: 1.21.6
 
** Please be patient while the chart is being deployed **
 
NGINX can be accessed through the following DNS name from within your cluster:
 
    nginx-web-server.default.svc.cluster.local (port 80)
 
To access NGINX from outside the cluster, follow the steps below:
 
1. Get the NGINX URL by running these commands:
 
  NOTE: It may take a few minutes for the LoadBalancer IP to be available.
        Watch the status with: 'kubectl get svc --namespace default -w nginx-web-server'
 
    export SERVICE_PORT=$(kubectl get --namespace default -o jsonpath="{.spec.ports[0].port}" services nginx-web-server)
    export SERVICE_IP=$(kubectl get svc --namespace default nginx-web-server -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
    echo "http://${SERVICE_IP}:${SERVICE_PORT}"

Check pods and services

$ kubectl get pod,svc                                                   
NAME                                  READY   STATUS    RESTARTS   AGE
pod/nginx-web-server-7d9489c4-h775g   1/1     Running   0          21s
 
NAME                       TYPE           CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
service/kubernetes         ClusterIP      10.96.0.1      <none>        443/TCP        152m
service/nginx-web-server   LoadBalancer   10.97.190.71   <pending>     80:30736/TCP   21s

We can see that the nginx pods and services are running fine. 

Access the application

minikube will support both NodePort and LoadBalancer type accesses. In this case the external IP is pending as this is not configured yet. As we know the minikube is running inside the vm, we need to know the correct por-mapping for this nginx server. 

$ minikube service --url nginx-web-server                               
http://192.168.64.7:30736

Now you know the IP address and port to be used to access the nginx application. In this case, 192.168.64.7 is the IP address of minikube which you can also retrieve using the command `minikube ip`.

Open a browser and check your nginx application.

That’s it; you can try different applications and you will realize how easy it is to use minikube for your Kubernetes learning and development.

Wrap up

You can increase the NodePort range if you have multiple applications running or some different range is required.

minikube start --extra-config=apiserver.service-node-port-range=1-65535

Check minikube documentation for more details.

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Tags: deploy in minikube · minikube · minikube help · minikube using vagrant and ansible

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