Deploy NGINX on Kubernetes

For this I loaded Docker Desktop to walk through the different steps.

Command Line Method

From the command line create a NGINX pod named nginx-pod in the namespace of default (-n default) and if the job stops or restarts do not restart this pod (—restart=Never) —OneTime job

kubectl run nginx-pod --image=nginx --restart=Never --port=80 -n default

Verify the pod you just created (nginx-pod) is running

kubectl get pods

Now you need to expose the nginx-pod outside of Kubernetes over a specific port (in this case port 80)

kubectl expose pod nginx-pod --type=NodePort --port=80 --name=nginx-service

Verify the service you just created (nginx-service) is running

kubectl get svc

So this is a screenshot of me running it on my laptop with Docker for Mac

So if you want to access this pod that is now externally facing you see the 80:31613 above? This means if you open a browser and go to http://127.0.0.1:31613 you will be accessing the kubernetes pod.

Now let’s say you prefer to do ALL of this using a declarative programming way so let’s get started

Declarative YAML Method

Create a YAML file for nginx pod (nginx-pod.yaml):

apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
  labels:
    app: nginx
spec:
  containers:
  - name: nginx-container
    image: nginx:latest
    ports:
      - containerPort: 80

Apply the YAML file using below command:

kubectl apply -f nginx-pod.yaml -n default

This command tells Kubernetes to create or update the resource described in the YAML file. Which means it will create a nginx pod in default namespace

Verify the Pod is Running using below command:

kubectl get pods

Create a YAML file for nginx service (nginx-service.yaml):

apiVersion: v1
kind: Service
metadata:
  name: nginx-svc
  labels:
    app: nginx
spec:
  type: NodePort
  selector:
    app: nginx
  ports:
    - port: 80
      targetPort: 80

Apply the YAML file using below command:

kubectl apply -f nginx-service.yaml -n default

Verify the service is created using below command:

kubectl get svc

ROLLBACK/CLEANUP

COMMAND LINE

# Delete the service
kubectl delete service nginx-service

# Delete the pod
kubectl delete pod nginx-pod

YAML WAY

# Delete the service using the YAML file
kubectl delete -f nginx-service.yaml
# Verify that the service is deleted
kubectl get services

# Delete the pod using the YAML file
kubectl delete -f nginx-pod.yaml
# Verify that the pod is deleted
kubectl get pods