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Background Workers
==================
**This feature is experimental**.
Depending on your configuration, some features can slow down the application if they are executed in the same process as the HTTP request.
Kanboard can delegate these tasks to a background worker that listen for incoming events.
Example of feature that may slow down Kanboard:
- Sending emails via an external SMTP server can take several seconds
- Sending notifications to external services
This feature is optional and require the installation of a queue daemon on your server.
### Beanstalk
[Beanstalk](http://kr.github.io/beanstalkd/) is a simple, fast work queue.
- To install Beanstalk, you can simply use the package manager of your Linux distribution
- Install the [Kanboard plugin for Beanstalk](https://github.com/kanboard/plugin-beanstalk)
- Start the worker with the Kanboard command line tool: `./cli worker`
### RabbitMQ
[RabbitMQ](https://www.rabbitmq.com/) is a robust messaging system that is more suitable for high-availability infrastructure.
- Follow the official documentation of RabbitMQ for the installation and the configuration
- Install the [Kanboard plugin for RabbitMQ](https://github.com/kanboard/plugin-rabbitmq)
- Start the worker with the Kanboard command line tool: `./cli worker`
### Notes
- You should start the Kanboard worker with a process supervisor (systemd, upstart or supervisord)
- The process must have access to the data folder if you store files on the local filesystem or use Sqlite
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