Containerization is a game-changer for developers seeking consistency and portability across different environments. In this blog post, we'll walk through a practical example of Dockerizing a simple PHP application. By the end of this guide, you'll have a working Docker container serving a basic PHP app.
Overview
We'll containerize a basic PHP application using Docker. Here’s the PHP code we'll use:
<?php // index.php echo "Hello Docker!"; ?>
The Dockerfile we’ll create will build an image using PHP 8.2 and serve this PHP application on port 8000.
Step-by-Step Guide
Step 1: Create the App Folder
Start by creating a new folder for your project. For this example, let’s name it php-docker-app. Inside this folder, add two files:
- index.php - Contains the PHP application code.
- Dockerfile - Defines the container configuration.
Step 2: Write the Dockerfile
Here’s the content of the Dockerfile:
# Use the official PHP image FROM php:8.2-cli # Set the working directory WORKDIR /usr/src/app # Copy the PHP file into the container COPY index.php . # Expose port 80 (optional for CLI-based serving, not necessary in this example) EXPOSE 80 # Command to run the PHP server on port 8000 CMD ["php", "-S", "0.0.0.0:8000", "index.php"]
Step 3: Build the Docker Image
Open a terminal and navigate to the folder containing your Dockerfile and index.php. Run the following command to build your Docker image:
docker build -t php-helloworld .
This command does the following:
- Uses the Dockerfile to build an image.
- Tags the image with the name php-helloworld.
Step 4: Run the Docker Container
After successfully building the image, run a container from it using the command:
docker run -p 8000:8000 php-helloworld
Here’s what happens:
- The -p flag maps port 8000 on your host machine to port 8000 in the container.
- Docker runs the php-helloworld image and starts a PHP server on port 8000.
Step 5: Access Your App
Open a browser or use a tool like curl to navigate to:
http://127.0.0.1:8000/
You should see the following output:
<?php // index.php echo "Hello Docker!"; ?>
How It Works
- Base Image: The php:8.2-cli base image provides a ready-to-use PHP CLI environment.
- Working Directory: The WORKDIR /usr/src/app instruction sets the working directory inside the container.
- File Copy: The COPY index.php . command copies the PHP script from the host to the container.
- Command Execution: The CMD directive starts a PHP server that serves the index.php file.
Benefits of Dockerizing PHP Apps
- Consistency: Your app behaves the same across different environments.
- Portability: The app can run anywhere Docker is installed.
- Ease of Setup: No need to install PHP or configure servers locally.
Next Steps
This guide demonstrated the basics of Dockerizing a simple PHP app. To take it further:
- Add a web server like Apache or Nginx to handle more complex scenarios.
- Create a docker-compose.yml file to manage multi-container setups.
- Integrate database services or other dependencies.
Conclusion
With just a few steps, you’ve successfully Dockerized a PHP application. This approach is perfect for creating isolated, reproducible development environments. Try it out for more complex projects and see how Docker streamlines your workflow!
The above is the detailed content of Dockerizing a Simple PHP Application. For more information, please follow other related articles on the PHP Chinese website!
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