# PHP and Microservices with Kubernetes

## 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!