## Introduction
In this article, we will learn how to deploy a PHP application using microservices architecture on Kubernetes. Microservices is an architectural style that structures an application as a collection of loosely coupled services, which are independently deployable and scalable.
### Steps Overview
| Steps | Description |
|---------------------|-----------------------------------------------------------------------------|
| Step 1: Set up PHP Application | Create a simple PHP application |
| Step 2: Dockerize PHP Application | Containerize the PHP application using Docker |
| Step 3: Deploy PHP App on Kubernetes | Deploy the Dockerized PHP application on Kubernetes cluster |
| Step 4: Expose PHP Service | Expose the PHP service to the outside world using Kubernetes Service |
### Step 1: Set up PHP Application
First, create a simple PHP application. For example, let's create an index.php file with the following content:
```php
echo "Hello, World!";
?>
```
### Step 2: Dockerize PHP Application
To containerize the PHP application, create a Dockerfile in the root directory of the project with the following content:
```Dockerfile
# Use the official PHP image
FROM php:7.4-apache
# Copy PHP files to the Apache root directory
COPY index.php /var/www/html/
```
Build the Docker image by running the following command in the terminal:
```bash
docker build -t php-app .
```
### Step 3: Deploy PHP App on Kubernetes
To deploy the Dockerized PHP application on Kubernetes, create a deployment YAML file. For example, create a file named php-deployment.yaml with the following content:
```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: php-app
spec:
replicas: 3
selector:
matchLabels:
app: php-app
template:
metadata:
labels:
app: php-app
spec:
containers:
- name: php-app
image: php-app
ports:
- containerPort: 80
```
Apply the deployment to the Kubernetes cluster:
```bash
kubectl apply -f php-deployment.yaml
```
### Step 4: Expose PHP Service
To expose the PHP service, create a Kubernetes Service YAML file. Create a file named php-service.yaml with the following content:
```yaml
apiVersion: v1
kind: Service
metadata:
name: php-service
spec:
selector:
app: php-app
ports:
- protocol: TCP
port: 80
targetPort: 80
type: NodePort
```
Apply the service to the Kubernetes cluster:
```bash
kubectl apply -f php-service.yaml
```
Now, you should be able to access the PHP application via the NodePort provided by the service.
In conclusion, we have successfully deployed a PHP application using microservices architecture on Kubernetes. By following these steps, you can create scalable and maintainable applications with ease. Happy coding!