deploy-nginx.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment # k8s deployment creates pods (instances of containers) and ensures the spec mentioned below is maintained (declarative)
spec:
  selector:
    matchLabels:
      app: nginx-app # container name - used for ensure replica count is always maintained
  replicas: 1 # no of pods to run
  template:
    metadata:
      labels:
        app: nginx-app # container name
    spec:
      containers:
        - name: nginx-app # container name
          image: my-nginx-image # docker image name. Have this build already
          imagePullPolicy: Never # Don't pull from remote docker registry during local testing
          ports:
            - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-service # a service exposes deployments/pods to other microservices in our cluster/external traffic
spec:
  selector:
    app: nginx-app # container name
  ports:
    - name: http
      port: 80
      targetPort: 80

// Build docker image using our dockerfile (refer the other gist)
docker build -t my-nginx-image -f Dockerfile .

// Create k8s resources mention in our file - i.e. Deployment and Service
kubectl apply -f nginx-deploy.yml

// Used for exposing traffic from localhost to docker instances (inside kubernetes cluster) - Access using localhost:8080
kubectl port-forward service/nginx-service 8080:80