First example of Kubernetes application deployment

After installing our Kubernetes cluster, we will deploy an application in it. First of all, it is important to know that when we deploy an application in Kubernetes, we create a new instance of the Docker image in a cluster pod, so we need to have a Docker image that contains the application.

For our example, we will use the Docker image that contains a web application that we have pushed in the Docker Hub in Chapter 7, Containerizing Your Application with Docker.

To deploy this instance of the Docker image, we will create a new k8sdeploy folder, and, inside it, we will create a Kubernetes deployment YAML specification file (myapp-deployment.yml) with the following content:

---
apiVersion: apps/v1
kind: Deployment
metadata:
 name: webapp
spec:
 selector:
    matchLabels:
      app: webapp
 replicas: 2
 template:
    metadata:
     labels...