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HomeBackend DevelopmentPHP TutorialHow to use PHP to implement Docker containerization
How to use PHP to implement Docker containerizationJun 22, 2023 pm 09:56 PM
Container orchestrationphp containerizationdocker deployment

With the development of cloud computing technology, Dockerization has become more and more popular. In the process of Dockerization, PHP also plays an important role. In this article, we will explore how to implement Docker containerization using PHP.

  1. Install Docker and Docker Compose

First, we need to install Docker and Docker Compose to quickly build the PHP container we need in the local environment. If you don't know Docker and Docker Compose yet, you can refer to the official documentation to learn first.

  1. Writing the Dockerfile

The next step is to write the Dockerfile, which is where we define the container environment. There you can specify the required base image, install the required packages, and run any init scripts. The following is a simple Dockerfile example:

FROM php:7.4-apache

RUN apt-get update && apt-get install -y 
    git 
    libzip-dev 
    && docker-php-ext-install zip 
    && docker-php-ext-enable zip 
    && rm -rf /var/lib/apt/lists/*

WORKDIR /var/www/html

COPY . .

RUN chown -R www-data:www-data /var/www/html

EXPOSE 80

The above Dockerfile uses the official PHP:7.4-apache image and installs Git and libzip-dev packages. Then we install the zip extension for PHP and enable the extension. Finally copy the entire application into the container and make sure the folder permissions are set correctly. Finally, we expose port 80 of the container through the EXPOSE command. If you have other ports that need to be exposed, you can also specify them here.

  1. Writing the Docker Compose file

With the Dockerfile, we can build the PHP container in the local environment. But usually we need more containers to build the entire application. At this time, we can use Docker Compose to manage multiple containers. The following is a simple Docker Compose file example:

version: '3.3'

services:
  web:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - "8000:80"
    volumes:
      - .:/var/www/html
    depends_on:
      - mysql

  mysql:
    image: mysql:5.7
    environment:
      MYSQL_RANDOM_ROOT_PASSWORD: "yes"
      MYSQL_DATABASE: "app_db"
      MYSQL_USER: "app_user"
      MYSQL_PASSWORD: "app_password"
    volumes:
      - db_data:/var/lib/mysql

volumes:
  db_data:

The above Docker Compose file defines two services: web and mysql. The web service uses the Dockerfile we wrote previously to build the container and maps the container's port 80 to the local port 8000 so that we can access the container locally. Additionally, we map the current directory to the /var/www/html directory in the container so that the container can access our application code. Finally, the web service also depends on the mysql service, that is, if the mysql service is not started, the web service cannot be started.

The mysql service uses the official mysql:5.7 image, and environment variables are specified to set the root password and database account password. In addition, we use volumes to persist mysql data.

  1. Build and start the container

With the Dockerfile and Docker Compose file, we can build and start the container. To build the container, go to the directory where the Docker Compose file is located in the terminal and run the following command:

docker-compose build

This command will build all the containers of the application based on the Docker Compose file, including the web and mysql containers.

Next, run the following command to start the application:

docker-compose up

This will start all the containers and connect them together. We can access our application by entering http://localhost:8000 in the browser.

  1. Summary

The above are the basic steps to implement Docker containerization using PHP. This approach is a convenient way to make application deployment and maintenance more efficient. Through Docker, we can quickly switch from the development environment to the production environment, while also ensuring the consistency of the application in different environments. If necessary, it can be changed and customized to suit your application needs. Of course, Docker is also a huge tool, which requires us to have sufficient understanding and mastery of it while using it.

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