How to build deployable applications using PHP and Docker

With the rapid development of the Internet, more and more applications need to be deployed based on cloud servers, and using Docker container technology is a good choice to achieve this goal. In this article, we will introduce how to use PHP and Docker to build deployable applications to achieve a more efficient and stable deployment experience.

1. What is Docker?

Docker is a container technology that packages programs and dependencies into containers so that they can be easily deployed in different environments. Unlike virtual machines, which emulate a physical machine through complete hardware emulation, Docker containers run on the host operating system and use host operating system resources, allowing for easier deployment and more efficient resource utilization.

2. Why use Docker?

The main benefits of using Docker containers are as follows:

1. Faster deployment: Docker can start containers in seconds, so deployment is faster.

2. Less resource usage: Docker containers run on the host operating system, so they take up less resources, thus saving server resources.

3. Easier migration: Docker containers can be easily deployed in different environments, making it ideal for cross-platform applications.

3. Build a Docker container

The following are the basic steps to build a Docker container.

1. Basic file settings

Create a folder and create a file named Dockerfile in the folder. All the instructions and instructions required for the container are defined in the Dockerfile step.

In the Dockerfile file, we need to use the FROM instruction to select the base Docker image, and use the RUN instruction to execute the command. For example, the following instructions select the basic PHP image, update software sources, and install dependency packages.

FROM php:7.2-apache

RUN apt-get update && apt-get install -y

    git 
    zip 
    unzip 
    vim 
    libpng-dev 
    libjpeg62-turbo-dev 
    libfreetype6-dev 
&& docker-php-ext-install pdo_mysql mysqli gd 
&& a2enmod rewrite

2. Put the application into the container

The COPY directive can copy an application into a Docker container. For example, the following code will copy all files in the local application backup folder to the container's /var/www/html directory.

COPY ./backup /var/www/html

3. Install Composer in the container

In the container, we need to install Composer for the PHP project. In the Dockerfile file, we can install Composer using the following instructions:

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

4. Expose container port

Use the EXPOSE command to expose the container port to the outside world:

EXPOSE 80

5. Run container

Finally, build the Docker image using the following command:

docker build -t my-php-app .

Then, run the container and put it Port mapped to the host:

docker run -p 80:80 my-php-app

After running these commands, you can access http://localhost or the IP address of the host , check if your application has run successfully!

4. Summary

This article introduces how to use PHP and Docker containers to build deployable applications. Using Docker for application deployment will greatly reduce the workload of developers and operation and maintenance personnel, resulting in a more efficient and stable deployment experience.

If you have completed this experiment, I believe you have mastered the basic Docker container building methods and usage skills. In the future development and deployment process, you can use these skills to greatly improve your development and deployment efficiency.

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