How to develop Dockerized applications using PHP + MySQL?

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Uploaded on 2015-7-30 17:39

In program development, it is definitely not enough to only know one technology. The development of many applications requires the use of multiple technologies. Today we will talk to you about how to build a Linux + Apache + MySQL + PHP application based on the LAMP technology stack and using Docker images.

1. Create a PHP development application container

First, select the official PHP image as the base image of the project.

dockerfile

FROMdaocloud.io/php:5.6-apache

Next, use the official PHP image built-in command docker-php-ext-install to install PHP’s MySQL extension dependency.

dockerfile

RUNdocker-php-ext-install pdo_mysql

The dependency package is installed through docker-php-ext-install. If the dependency package requires configuration parameters, use the docker-php-ext-configure command.

Install pdo_mysql PHP extension.

Then, copy the code to the target directory.

dockerfile

COPY ./var/www/html/

Because the exposed port and startup command have been declared in the base image, they can be omitted here.

At this point, the Docker container containing PHP application development is ready. The parameters required to access the database in PHP code are declared by reading environment variables.

```php

$serverName =env("MYSQL_PORT_3306_TCP_ADDR", "localhost");

$databaseName = env("MYSQL_INSTANCE_NAME","homestead");

$username = env(" MYSQL_USERNAME","homestead");

$password =env("MYSQL_PASSWORD", "secret");

/**

* Get environment variables

* @param $key

* @param null$default

* @returnnull|string

*/

functionenv($key, $default = null)

{

$value =getenv($key);

if ($value ===false) {

return $default;

www.maiziedu.com

}

return $value;

}

```

Why do you do this? Because in the best practices of Docker application development, stateful data services are usually run in another container, and the application container and data container are dynamically connected through the container-specific link mechanism.

2. Bind the local MySQL data container

First, you need to create a MySQL container.

bash

docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d daocloud.io/mysql:5.5

After that, through the link mechanism between Docker containers, the default port of MySQL can be changed (3306) Exposed to the application container.

bash

docker run --name some-app --link some-mysql:mysql -d app-that-uses-mysql

3. Bind the cloud MySQL data service

Compared to creating it locally, It will be easier to create and bind MySQL data services in the cloud.

a. Fork DaoCloud/php-apache-mysql-sample on GitHub or add your own code repository.

b. Register as a DaoCloud user.

c. Select "Code Build" in the DaoCloud "Console".

d. Create a new project, select the code source, and start building the image.

e. Create a MySQL service instance in "Service Integration".

f. Associate the built application image with the MySQL service instance and deploy it in the cloud.

The above are the specific steps to implement Docker application through PHP + MySQL. If you are still unclear, you can try it yourself.

Recommended learning: php video tutorial http://www.maiziedu.com/course/php/