Deploy Symfony with Docker: Get started developing quickly

Deploy Symfony with Docker: Start developing quickly

Introduction:
With the rapid development of cloud computing and containerization technology, Docker has become a developer deployment and one of the go-to tools for managing applications. Symfony, as a popular PHP framework, can also be deployed through Docker, which greatly simplifies the development and deployment process. This article will introduce how to use Docker to deploy Symfony applications and provide specific code examples.

Step 1: Install Docker and Docker Compose
First, we need to install Docker and Docker Compose on the local machine. The installation steps of Docker can be found on the official website and should be installed accordingly according to the operating system. Docker Compose can be installed through the pip command, for example, run pip install docker-compose.

Step 2: Create a Symfony application
After installing Docker and Docker Compose, we can create a new Symfony application. Use the following command to create a new Symfony project:

docker run --rm -v $(pwd):/app composer create-project symfony/website-skeleton my-project

This command will create a Symfony application named my-project in the current directory.

Step 3: Write a Docker Compose file
Next, we need to write a Docker Compose file to define our application’s services and dependencies. Create a file named docker-compose.yml in the root directory of the project and add the following content:

version: '3'

services:
  app:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - 8000:8000
    volumes:
      - .:/app
    working_dir: /app
    depends_on:
      - mysql

  mysql:
    image: mysql:5.7
    environment:
      - MYSQL_ROOT_PASSWORD=root
      - MYSQL_DATABASE=my_database

This Docker Compose file defines two services: one is the Symfony application program and the other is a MySQL database. The Symfony service uses a custom Dockerfile to build the image and maps port 8000 to port 8000 of the host. The MySQL service uses the official MySQL 5.7 image, and sets the root password and database name.

Step 4: Write a Dockerfile
In order to build the Docker image of the Symfony application, we need to write a Dockerfile. Create a file named Dockerfile in the root directory of the project and add the following content:

FROM php:7.4-apache

RUN apt-get update && apt-get install -y 
    git 
    unzip 
    libonig-dev 
    libxml2-dev

RUN docker-php-ext-install pdo_mysql mbstring xml

COPY . /var/www/html

WORKDIR /var/www/html

RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

RUN composer install --no-interaction --optimize-autoloader

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

This Dockerfile uses the official PHP 7.4 image as the base image and installs some necessary dependence. Then, copy the Symfony application's code into the specified directory of the container and use Composer to install the application's dependencies. Finally, we set the Apache server's document root to the Symfony application's directory and modify the permissions of all files to be writable by Apache.

Step 5: Build and run the container
After everything is ready, we can use Docker Compose to build and run the container. Run the following command in the root directory of the project:

docker-compose up -d

This command will automatically build the Docker image of the Symfony application and create and run two containers: one is the Symfony application container and the other is the MySQL database container. The application is now accessible via localhost:8000.

Conclusion:
By using Docker to deploy Symfony applications, we can quickly start the development and deployment process and avoid dependencies on the local environment. Using Docker Compose to define services and dependencies can make the entire development and deployment process more streamlined and reliable. We hope that the code examples provided in this article can help readers better understand and use Docker to deploy Symfony applications.

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