Test your PHP deployment - Docker

Prerequisites

Complete all the previous sections of this guide, starting with Containerize a PHP application.
Turn on Kubernetes in Docker Desktop.

Overview

In this section, you'll learn how to use Docker Desktop to deploy your application to a fully-featured Kubernetes environment on your development machine. This allows you to test and debug your workloads on Kubernetes locally before deploying.

Create a Kubernetes YAML file

In your docker-php-sample directory, create a file named docker-php-kubernetes.yaml. Open the file in an IDE or text editor and add the following contents. Replace DOCKER_USERNAME/REPO_NAME with your Docker username and the name of the repository that you created in Configure CI/CD for your PHP application.

yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: docker-php-demo
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      hello-php: web
  template:
    metadata:
      labels:
        hello-php: web
    spec:
      containers:
        - name: hello-site
          image: DOCKER_USERNAME/REPO_NAME
          imagePullPolicy: Always
---
apiVersion: v1
kind: Service
metadata:
  name: php-entrypoint
  namespace: default
spec:
  type: NodePort
  selector:
    hello-php: web
  ports:
    - port: 80
      targetPort: 80
      nodePort: 30001

In this Kubernetes YAML file, there are two objects, separated by the ---:

A Deployment, describing a scalable group of identical pods. In this case, you'll get just one replica, or copy of your pod. That pod, which is described under template, has just one container in it. The container is created from the image built by GitHub Actions in Configure CI/CD for your PHP application.
A NodePort service, which will route traffic from port 30001 on your host to port 80 inside the pods it routes to, allowing you to reach your app from the network.

To learn more about Kubernetes objects, see the Kubernetes documentation.

Deploy and check your application

In a terminal, navigate to the docker-php-sample directory and deploy your application to Kubernetes.
console
```
$ kubectl apply -f docker-php-kubernetes.yaml
```
You should see output that looks like the following, indicating your Kubernetes objects were created successfully.
text
```
deployment.apps/docker-php-demo created
service/php-entrypoint created
```

Make sure everything worked by listing your deployments.

console

$ kubectl get deployments

Your deployment should be listed as follows:

text

NAME                 READY   UP-TO-DATE   AVAILABLE   AGE
docker-php-demo      1/1     1            1           6s

This indicates all of the pods are up and running. Do the same check for your services.

console

$ kubectl get services

You should get output like the following.

text

NAME              TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
kubernetes        ClusterIP   10.96.0.1        <none>        443/TCP          7d22h
php-entrypoint    NodePort    10.111.101.229   <none>        80:30001/TCP     33s

In addition to the default kubernetes service, you can see your php-entrypoint service. The php-entrypoint service is accepting traffic on port 30001/TCP.

Open a browser and visit your app at http://localhost:30001/hello.php. You should see your application.
Run the following command to tear down your application.
console
```
$ kubectl delete -f docker-php-kubernetes.yaml
```

Summary

In this section, you learned how to use Docker Desktop to deploy your application to a fully-featured Kubernetes environment on your development machine.

Related information: