PHP implements open source Rancher container management platform

With the rise of cloud computing and container technology, container orchestration platforms are attracting more and more attention. Rancher is an open source container management platform that supports a variety of container orchestration tools such as Kubernetes, Mesos, and Docker Swarm. It provides a friendly web management interface, making the operation and maintenance of container clusters more convenient and efficient. This article will introduce how to develop a container management platform similar to Rancher based on PHP.

1. Preparation

Before starting development, you need to prepare the following tools:

• Docker: used to deploy, manage and run containers.
• PHP 7.0 and above: used for writing web applications and interacting with the Docker API.
• Composer: used to obtain and manage PHP dependencies.
• Git: Used to clone Rancher source code from GitHub.

2. Installing dependencies

Before development, we need to install some PHP dependency packages, which can be installed using Composer. Enter the code directory in the terminal and execute the following command:

composer install

This command will read the PHP dependencies from the composer.json file and install them in the vendor directory.

3. Build a Docker image

Before we start writing code, we need to build a Docker image to deploy our application. In the code directory, create a file named Dockerfile with the following content:

Dockerfile

FROM php:7.4-apache

COPY . /var/www/html

RUN rm /etc/apt/preferences.d/no-debian-php &&

apt-get update && 
apt-get install -y 
        git 
        unzip 
        libzip-dev 
        && 
docker-php-ext-install -j$(nproc) 
        zip 
        && 
curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

RUN composer install --no-interaction --no-dev --prefer-dist &&

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

EXPOSE 80

This Dockerfile uses the official PHP 7.4 image as the base image, and installs tools such as Apache, Git, unzip, and PHP zip extension. Composer is also installed to facilitate the installation of PHP dependency packages. Finally, the container will listen on port 80, ready to receive HTTP requests.

Then, use the following command to build the image:

docker build -t my-rancher .

This command will build an image named my-rancher in the current directory The Dockerfile below is modeled.

4. Writing code

Before writing code, we need to understand the Docker API first. Docker provides RESTful API interfaces, which we can access through HTTP requests to create, manage and monitor containers. For example, we can use the following command to list all currently running containers:

curl --unix-socket /var/run/docker.sock http:/v1.24/containers/json

Among them, /var/run/docker.sock is the UNIX socket of Docker, which means we use this socket to access the Docker API. We can also use TCP ports to access the API.

With this foundation, we can start writing code. In the code directory, create a file named index.php with the following content:

require_once DIR . '/vendor/autoload.php ';

use GuzzleHttpClient;

$client = new Client([

'base_uri' => 'unix:///var/run/docker.sock',
'headers' => [
    'Content-Type' => 'application/json',
    'Accept' => 'application/json'
]

]);

$response = $client->get( '/v1.24/containers/json');

$containers = json_decode($response->getBody());

foreach ($containers as $container) {

$name = str_replace('/', '', $container->Names[0]);
echo "<li>$name</li>";

}

?>

This file uses the Guzzle HTTP client library to access the Docker API and get a list of all running containers and list them.

5. Start the container

Now, we can use the following command to start the container:

docker run -d --name my-rancher -p 80 :80 my-rancher

This command will start a my-rancher container and map the container's port 80 to the host's port 80. Now, we can access our application through the browser by accessing http://localhost.

6. Summary

This article introduces how to build a Rancher-like container management platform based on PHP. We use Docker and PHP 7.0 or above, write code to access the Docker API, and use Composer to manage PHP dependencies. Building a container management platform like Rancher requires more development work, but this tutorial can help readers understand how to use PHP to interact with the Docker API, providing a foundation for subsequent development.

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