ActuatorBundle

ActuatorBundle provides basically two features:

• It provides an endpoint which can be used as a health probe url
• With another endpoint you can read runtime informations about the deployed software

It is also easily extensible, so you add your custom logic to both features. Some predefined extensions can be also found within this GitHub organization.

The bundle is heavily inspired by akondas/symfony-actuator-bundle.

Installation

Make sure Composer is installed globally, as explained in the installation chapter of the Composer documentation.

Applications that use Symfony Flex

Open a command console, enter your project directory and execute:

$ composer require symsensor/actuator-bundle

Applications that don't use Symfony Flex

Step 1: Download the Bundle

Open a command console, enter your project directory and execute the following command to download the latest stable version of this bundle:

$ composer require symsensor/actuator-bundle

Step 2: Enable the Bundle

Then, enable the bundle by adding it to the list of registered bundles in the config/bundles.php file of your project:

// config/bundles.php

return [
    // ...
    SymSensor\ActuatorBundle\SymSensorActuatorBundle::class => ['all' => true],
];

After the installation you have to configure the routing in your config/routes.yaml file:

actuator:
  resource: '@SymSensorActuatorBundle/config/routing.yaml'
  prefix: /_actuator

The routing defines two endpoints:

• <prefix>/health
• <prefix>/info

You should secure the two endpoints with the builtin Security so that the two endpoints are not public accessible.

Configuration

The Bundle can be configured with a configuration file named config/packages/sym_sensor_actuator.yaml. Following snippet shows the default value for all configurations:

sym_sensor_actuator:
  health:
    enabled: true
    builtin:
      disk_space:
        enabled: true
        threshold: 52428800
        path: '%kernel.project_dir%'
  info:
    enabled: true
    builtin:
      php:
        enabled: true
      symfony:
        enabled: true
      git:
        enabled: true

Following table outlines the configuration:

key	default	description
sym_sensor_actuator.health.enabled	true	if the health endpoint should be enabled
sym_sensor_actuator.health.disk_space.enabled	true	if the builtin disk_space health endpoint should be enabled
sym_sensor_actuator.health.disk_space.threshold	52428800	Size in bytes which has to be free in order that this health endpoint is "UP"
sym_sensor_actuator.health.disk_space.path	'%kernel.project_dir%'	The directory which should be monitored
sym_sensor_actuator.info.enabled	true	if the info endpoint should be enabled
sym_sensor_actuator.info.builtin.php.enabled	true	if the php info endpoint should be enabled
sym_sensor_actuator.info.builtin.symfony.enabled	true	if the symfony info endpoint should be enabled
sym_sensor_actuator.info.builtin.git.enabled	true	if the git info endpoint should be enabled

Extending

Health indicator

You can write your own health indicator and implement your own logic to determine the state of your application. To do so, you have to implement the interface HealthIndicator and tag your service with the tag sym_sensor_actuator.health_indicator.

So for example, add following class under src/Health/CustomHealthIndicator.php:

<?php

declare(strict_types=1);

namespace App\Health;

use SymSensor\ActuatorBundle\Service\Health\HealthIndicator;
use SymSensor\ActuatorBundle\Service\Health\Health;

class CustomHealthIndicator implements HealthIndicator
{
    public function name(): string
    {
        return 'custom';
    }

    public function health(): Health
    { 
        return Health::up()->setDetails(['state' => 'OK!']);
    }
}

Then add following definition to config/services.yaml:

services:
  App\Health\CustomHealthIndicator: 
    tags: ['sym_sensor_actuator.health_indicator']

Information Collector

Similar to a health indicator, you can write also a service which exposes informations. To do so, you have to implement the interface Collector and add the tag sym_sensor_actuator.info_collector.

<?php

declare(strict_types=1);

namespace App\Info;

use SymSensor\ActuatorBundle\Service\Info\Collector\Collector;
use SymSensor\ActuatorBundle\Service\Info\Info;

class CustomInfoCollector implements Collector
{
    public function collect(): Info
    {
        return new Info('my-info', [ 'time' => time() ]);
    }
}

Then add following definition to config/services.yaml:

services:
  App\Info\CustomInfoCollector: 
    tags: ['sym_sensor_actuator.info_collector']

License

ActuatorBundle is released under the MIT Licence. See the bundled LICENSE file for details.

Author

Originally developed by Arkadiusz Kondas