Koel Documentation

# Home

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# Introduction

Koel (also styled as koel, with a lowercase k) is a simple web-based personal audio streaming service written in Vue at the client side and Laravel on the server side. Targeting web developers, Koel embraces some of the more modern web technologies – flexbox, audio and drag-and-drop API to name a few – to do its job.

# Requirements

Koel has two components, each with its own set of requirements:

# Server

  • All requirements by Laravel – PHP, OpenSSL, composer and such. Consider setting PHP's memory_limit to a good value (512M or better) if you have a big library.
  • MySQL, MariaDB, PostgresSQL, or SQLite. Actually, any DBMS supported by Laravel should work.
  • NodeJS latest stable with yarn

# Client

  • Any decent web browser will do – Koel has been tested on Chrome 47, Firefox 42, Safari 8, Opera 34, and Edge.

# Installation

# Manually

From your console, run the following commands:

cd <PUBLIC_WEB_DIRECTORY_FOR_KOEL>
git clone --recurse-submodules https://github.com/phanan/koel.git .
git checkout v4.0.0 # Check out the latest version at https://github.com/phanan/koel/releases
composer install
php artisan koel:init # Populate credentials during the process

php artisan serve

You should now be able to visit http://localhost:8000 in your browser and start using Koel.

Use a proper webserver

http://localhost:8000 is only the development server for Koel (or rather, Laravel). For optimal performance, you'll want to set up the production version, the configuration of which varies depending on your webserver of choice (Apache, Nginx, Caddy etc.) and is outside of this document's scope, but shouldn't be any different from that of a standard PHP application.

If you're on Debian, here's an unofficial installation guide. This may or may not be out of date, so use it with your own risk.

If you want more control, edit .env file. There's quite a few settings there to tweak Koel to your needs. Remember to reload the server for the changes to take effects.

# Docker

Koel doesn't maintain an official Docker image, but community-supported ones like hyzual/koel, 0xcaff/koel, and binhex/arch-koel are available.

# Upgrade

Check out Releases for upgrade guides corresponding to your Koel version.

# Configuration and Usage

# Scanning for Music

Koel is simple. It doesn't handle uploading. It doesn't stream from Spotify. Instead, you upload your songs into a readable directory on your server – preferably outside of your web root dir – and configure Koel to scan and sync it. Such configuration can be found under Manage -> Settings.

Settings Screen

You can also scan from the CLI – which is faster, without a time limit, and provides feedbacks – with the artisan koel:sync command:

$ php artisan koel:sync
Koel syncing started.

 953/953 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%

Completed! 944 new or updated song(s), 0 unchanged song(s), and 9 invalid file(s).

Suffix the command with a -v flag for more details e.g. syncing errors.

This command can also be added as a cron job, for example to run every midnight:

0 0 * * * cd /home/user/webapps/koel/ && /usr/local/bin/php70 artisan koel:sync >/dev/null 2>&1

As of current, Koel recognizes these audio extensions: .mp3, .ogg, .m4a (experimental), and .flac (experimental with some limitations). Others may be added in the future.

If you're syncing compilation albums (albums with multiple songs from different artists) make sure the "Band" tag is set, otherwise each song will end up in its own album. Some ripping software sets this automatically; make sure yours does.

Watch a directory

Starting from v2.1.0, you can watch a directory and sync on the fly with inotifywait.

Host your media on Amazon S3

Starting from v3.0.0, you can use Koel with Amazon S3.

# Streaming Music

Koel supports three streaming methods which can be configured via a STREAMING_METHOD setting in .env file:

  • php: Use native PHP readfile(). This is the default method, and the slowest and most unstable one. Only use this method if you can't others.

  • x-sendfile: Use Apache's mod_xsendfile module. You'll need to install and configure the module manually. A sample configuration is as following:

    LoadModule xsendfile_module   libexec/apache2/mod_xsendfile.so

# These configuration can be put in the VirtualHost directive as well
<IfModule mod_xsendfile.c>
  XSendFile on
  XSendFilePath /mnt/media
</IfModule>

  • x-accel-redirect: Use nginx's X-Accel module. Refer to nginx.conf.example for a sample nginx configuration file.

Notice

STREAMING_METHOD doesn't have effects if you're serving songs from Amazon S3.

# Using the Web Interface

Using the client component of Koel should be straightforward enough. If you've ever used Spotify, you should feel right at home. As a matter of fact, Koel's client interface is a shameless rip-off of Spotify's. You can search, you can sort, you can view by artists or albums, you can create playlists, you can like/unlike songs, and you can create other users to share the vibes. There are a couple of shortcut keys, too, for the nerds:

  • F sets the focus into global search box
  • Enter plays a song. If multiple songs are being selected, Enter adds them to the bottom of the queue, Shift+Enter queues them to top. Adding a Cmd or Ctrl into the combo plays the first selected song right away.
  • Space toggles playback
  • J plays the next song in queue
  • K plays the previous song in queue
  • Ctrl/Cmd+A selects all songs in the current view
  • Delete removes selected song(s) from the current queue/playlist

If you're using Chrome > 73, you can control Koel using hardware media keys without even having Koel or the browser focused.

# Remote Controller

Starting from v3.7.0, Koel has a (mobile) remote controller that lets you control a desktop instance – play/pause, navigate, turn volume up/down, and add/remove from Favorites.

Remote controller screenshot

In order to use the feature:

  1. Register a Pusher account and create an app
  2. Populate the app's credentials into .env (those start with PUSHER_)
  3. Reload the desktop Koel instance
  4. Go to http://<your-koel-host>/remote on a mobile device to start controlling remotely. You may also want to add the URL to the home screen for faster access later.

# Reset Admin Password

Starting from v4.1.1, Koel comes with a handy CLI command to reset the admin password in case you lose it:

php artisan koel:admin:change-password

For older versions, you can make use of Laravel's Tinker, as described here.

# Mobile Support and Limitation

The client component of Koel has a responsive GUI that works fairly well on a mobile device. Certain functionalities are not available, however, some due to technology limitation, some my incompetence. For instance:

  • Shortcut keys don't work (duh)
  • Equalizer may not work
  • Volume must be controlled from a system level
  • Next songs can't be played automatically if the browser is minimized, or if the device is locked Update: On iOS, it appears that Google Chrome can still play next songs even if the device is locked, as long as the browser remains maximized.
  • Next and previous songs can't be controlled from Control Center or lock screen

If you know how to fix these issues and enhance Koel's experience, read on.

# Contribution

I decided to write Koel out of my desperation of not being able to find a decent and simple streaming service that fits my needs. This is my very first hands-on with Vue and ES6, and the code must smell so bad. So, any contribution is much appreciated. Bug reports? Bug fixes? Code optimization? Tests? Ideas? Documentation? Please send them over.

# Credits

Koel is built on the shoulder of the giants. My sincere thanks go to the guys behind Vue, Laravel, as well as all JavaScript and PHP packages used in the project.

# Sponsors and Support

The continuous development of Koel is made possible thanks to the support of these awesome sponsors:

Exoscale

Want to help as well? You can support Koel's development via OpenCollective or GitHub Sponsors.