Demo deployment

On machines which meet the following requirements, one can install Kurento Room applications as a system service (e.g. kurento-room-demo).

This section explains how to deploy (install, configure and execute) the Room Demo application. We also provide a way to run the demo without resorting to a system-wide installation.

System requirements:

  • Ubuntu 14.04

  • Git (to obtain the source code)

  • Java JDK version 8

  • Maven (for building from sources)

  • Bower (which in turn requires Node.js)

    curl -sL | sudo bash -
    sudo apt-get install -y nodejs
    npm install -g bower
  • Kurento Media Server or connection with at least a running instance (to install follow the official guide)

Installation procedures

Demo binaries

Currently, there are no binary releases of Kurento Room Demo. In order to deploy a new demo server, it is required to build it from sources.

$ git clone
$ cd kurento-room
# checkout the latest tag
$ git checkout $(git describe --abbrev=0 --tags)

Build from source

The demo has been configured to generate a zipped archive during the package phase of a Maven build. To obtain it, build the kurento-room-demo project together with its required modules:

$ cd kurento-room
$ mvn clean package -am -pl kurento-room-demo -DskipTests

Now unzip the generated execution binaries:

$ cd kurento-room-demo/target
$ unzip

The directory structure of the uncompressed binaries:

  • bin/ - contains the installation and execution scripts
  • files/ - the demo’s executable JAR file and other configuration files
  • sysfiles/ - used when installing as a system service


The configuration file, kurento-room-demo.conf.json is located in the files folder, when executing the demo with normal user privileges. When installing the demo application as a system service, the configuration files will be located inside /etc/kurento.

$ cd kurento-room-demo-6.6.0
$ vim files/kurento-room-demo.conf.json
## or ##
$ vim /etc/kurento/kurento-room-demo.conf.json

The default content of this file:

   "kms": {
      "uris": ["ws://localhost:8888/kurento", "ws://"]
   "app": {
      "uri": "https://localhost:8443/"
   "kurento": {
      "client": {
         "requestTimeout": 20000
   "demo": {
      //mario-wings.png or wizard.png
      "hatUrl": "mario-wings.png",
      "hatCoords": {
         // mario-wings hat
         "offsetXPercent": -0.35F,
         "offsetYPercent": -1.2F,
         "widthPercent": 1.6F,
         "heightPercent": 1.6F

         //wizard hat
         //"offsetXPercent": -0.2F,
         //"offsetYPercent": -1.35F,
         //"widthPercent": 1.5F,
         //"heightPercent": 1.5F
      "loopback" : {
         "remote": false,
         //matters only when remote is true
         "andLocal": false
      "authRegex": ".*",
      "kmsLimit": 1000

With the following key meanings:

  • kms.uris is an array of WebSocket addresses used to initialize KurentoClient instances (each instance represents a Kurento Media Server). In the default configuration, for the same KMS the application will create two KurentoClient objects. The KurentoClientProvider implementation for this demo ( will return KurentoClient instances on a round-robin base or, if the user’s name follows a certain pattern, will return the less loaded instance. The pattern check is hardcoded and SLA users are considered those whose name starts with the string special (e.g. specialUser).
  • kurento.client.requestTimeout is a tweak to prevent timeouts in the KMS communications during heavy load (e.g. lots of peers). The default value of the timeout is 10 seconds.
  • app.uri is the demo application’s URL and is mainly used for building URLs of images used in media filters (such as the hat filter). This URL must be accessible from any KMS defined in kms.uris.
  • demo.hatUrl sets the image used for the FaceOverlayFilter applied to the streamed media when the user presses the corresponding button in the demo interface. The filename of the image is relative to the static web resources folder img/.
  • demo.hatCoords represents the JSON encoding of the parameters required to configure the overlaid image. We provide the coordinates for two hat images, mario-wings.png and wizard.png.
  • demo.loopback.remote if true, the users will see their own video using the loopbacked stream from the server. Thus, if the user enables the hat filter on her video stream, she’ll be able to visualize the end result after having applied the filter.
  • demo.loopback.andLocal if true, besides displaying the loopback media, the client interface will also provide the original (and local) media stream.
  • demo.authRegex is the username pattern that allows the creation of a room only when it matches the pattern. This is done during the call to obtain an instance of KurentoClient, the provider will throw an exception if the pattern has been specified and it doesn’t match the name.
  • demo.kmsLimit is the maximum number of pipelines that can be created in a KurentoClient.


The application uses a Java keystore - keystore.jks - containing a self-signed certificate, which is located in the same folder as the JAR executable file.

The keystore’s configuration is read from a typical file, read by the Spring Boot framework when booting up the application. Although the default name can be used during development, for installation purposes we’ve changed the name to It can be edited directly in the files/ folder or in the service’s configuration folder (/etc/kurento) after installing the demo.

Any changes like the keystore’s name or password can be applied directly into this file.

These settings are read automatically by the application (not required to be on the command line).

server.port: 8443
server.ssl.key-store: keystore.jks
server.ssl.key-store-password: kurento
server.ssl.keyStoreType: JKS
server.ssl.keyAlias: kurento-selfsigned

In order to disable HTTPS, remove or rename the file, or remove those lines that contain ssl and change the value of server.port to a more suitable value (recommended only if using a secure proxy with SSL).

server.address configures the IP address where the embedded Tomcat container binds to (default value is, where it listens on all available addresses). It is useful when securing the application, by indicating the loopback IP and serving all connections through a secure proxy.

Logging configuration

The default logging configuration can be overwritten by editing the file, also found in the files folder (or /etc/kurento/ for system-wide installations).

$ cd kurento-room-demo-6.6.0
$ vim files/
## or ##
$ vim /etc/kurento/

In it, the location of the server’s output log file can be set up, the default location will be kurento-room-demo-6.6.0/logs/kurento-room-demo.log (or /var/log/kurento/kurento-room-demo.log for system-wide installations).

To change it, replace the ${application.log.file} variable with an absolute path on your system:

# e.g. -->

Running the application

After having built and unzipped the installation files, there are two options for running the demo application server:

  • user-level execution - doesn’t need additional installation steps, can be done right away after uncompressing the installer
  • system-level execution - requires installation of the demo application as a system service, which enables automatic startup after system reboots

In both cases, the application uses Spring Boot framework to run inside an embedded Tomcat container server, so there’s no need for deployment inside an existing servlet container. If this is a requirement, modifications will have to be made to the project’s build configuration (Maven) so that instead of a JAR with dependencies, the build process would generate a WAR file.

Run at user-level

After having configured the server instance just execute the start script:

$ cd kurento-room-demo-6.6.0
$ ./bin/

Run as daemon

First install the demo after having built and uncompressed the generated binaries. sudo privileges are required to install it as a service:

$ cd kurento-room-demo-6.6.0
$ sudo ./bin/

The service kurento-room-demo will be automatically started.

Now, you can configure the Room demo server as stated in the previous section and restart the service.

$ sudo service kurento-room-demo {start|stop|status|restart|reload}


For quickstarting and troubleshooting the demo use the following command to execute the fat jar from the lib folder:

$ cd kurento-room-demo-6.6.0/lib
$ java -jar kurento-room-demo.jar

Version upgrade

To update to a newer version, please repeat the installation procedures.