How to use Docker to deploy and manage PHP applications

How to use Docker to deploy and manage PHP applications

Introduction:
In today's cloud computing era, containerization technology is becoming more and more popular. As the leader among them, Docker has already become the containerization solution chosen by most developers. This article will introduce you to how to use Docker to deploy and manage PHP applications so that you can develop and deliver your applications more efficiently.

1. Install Docker and Docker Compose
First, we need to install Docker in the local environment. Please install according to the official documentation according to your operating system version: https://docs.docker.com/install/

After the installation is completed, we also need to install Docker Compose, which can help us manage multiple container application. Similarly, you can find the installation instructions suitable for your operating system in the official documentation: https://docs.docker.com/compose/install/

2. Create a Docker image
Before deploying a PHP application , we need to first create a Docker image containing the required environment. To do this, we need to create a file called Dockerfile in which we define the steps to build the image.

The following is an example Dockerfile:

# 使用一个基础的PHP镜像
FROM php:7.4-apache

# 安装所需的PHP扩展
RUN docker-php-ext-install pdo_mysql

# 将应用程序复制到工作目录
COPY . /var/www/html

# 设置Apache配置文件
COPY apache.conf /etc/apache2/sites-available/000-default.conf

# 设置Apache的DocumentRoot
RUN sed -ri -e 's!/var/www/html!/var/www/html/public!g' /etc/apache2/sites-available/000-default.conf

# 设置Apache访问权限
RUN chown -R www-data:www-data /var/www/html
RUN a2enmod rewrite

# 设置环境变量
ENV APACHE_DOCUMENT_ROOT=/var/www/html/public

# 暴露容器的端口
EXPOSE 80

# 启动Apache服务器
CMD ["apache2-foreground"]

The above Dockerfile uses php:7.4-apache as the base image , installed the pdo_mysql extension, copied the application into the specified directory of the container, set up the Apache configuration file, enabled the rewrite module, and set the DocumentRoot to the public directory of the application.

3. Write a Docker Compose file
Next, we need to write a Docker Compose file, which is used to define and manage the running and interaction of multiple containers.

The following is a sample docker-compose.yml file:

version: '3'
services:
  app:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - 8080:80
    volumes:
      - .:/var/www/html
    depends_on:
      - db
  db:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: secret
      MYSQL_DATABASE: mydatabase
      MYSQL_USER: myuser
      MYSQL_PASSWORD: mypassword

The above docker-compose.yml file defines two services : app and db. appThe service uses the Docker image we created previously, maps the container's port 80 to the local port 8080, and mounts the current directory to the container's /var/www/html Under contents. dbThe service uses the official image of MySQL, and sets the root password, database name and user password of the database.

4. Start the container
In the command line, enter the root directory of the project and execute the following command to start the container:

$ docker-compose up -d

Among them, the -d parameter indicates Start the container in the background.

5. Access the application
After the container is started, we can view the application by accessing http://localhost:8080 through the browser. If everything is fine, you will see your PHP application.

6. Manage Containers
Using Docker Compose, we can easily manage and operate multiple containers.

The following are some commonly used commands:

• Start the container: docker-compose up -d
• Close the container: docker- compose down
• View container status:docker-compose ps
• View container logs:docker-compose logs

7. Summary
By using Docker and Docker Compose, we can deploy and manage PHP applications more conveniently. By packaging applications and environments into containers, we ensure that applications run consistently across different environments and are easier to scale and deliver. Hopefully this article can provide you with basic knowledge and guidance on deploying and managing PHP applications with Docker. I wish you success in using Docker to develop and deliver your applications.

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