Skip to content


The remotelabz is divided in 4 parts :

  • remotelabz for the frontend
  • remotelabz-worker for the server which execute all VMs, called the backend
  • remotelabz-message-bundle uses by both remotelabz and remotelabz-worker to manage the message exchanged between the frontend and the backend
  • network-bundle uses by both frontend and backend

Certificates generation for local development

To develop on own machine, we need to build certificate to support both http and https protocols :

Generate the key for the server certificate

openssl genrsa 2048 > server-dev-rlz-ca.key

Generate the CA certificate

openssl req -new -x509 -days 365 -key server-dev-rlz-ca.key -out server-dev-rlz-ca.crt

Generate the key for the server certificate

openssl genrsa 2048 > server-dev-rlz.key

Create the CSR

openssl req -new -key server-dev-rlz.key -out server-dev-rlz.csr

Sign the certificate of the server: (do not forget to give the IP of your web server)

openssl x509 -req -in server-dev-rlz.csr -out server-dev-rlz.crt -CA server-dev-rlz-ca.crt -CAkey server-dev-rlz-ca.key -CAcreateserial -CAserial

Code organisation

The front's code is on templates directory.

The web page of a lab is on file view.html.twig and the lab is managed by a react component {{ react_component('InstanceManager', {'props': props}) }} defined in assets/js/components/Instances/

When a user starts a lab, a message (json) is sent to the worker and analyzed by MessageHandler/InstanceActionMessageHandler.php. The instance, which is a started lab, is managed by the Instance Manager service in Service/Instance/InstanceManager.php

Semantic Versioning

Use of ttyd and configurable-http-proxy

We assume the following. On the front :

configurable-http-proxy --port 8000 --api-port 8001 --log-level info --ssl-key /etc/apache2/RemoteLabz-WebServer.key --ssl-cert /etc/apache2/RemoteLabz-WebServer.crt --insecure 1 --proxy-timeout 3600 --ip --api-ip
The insecure is used for self-signed certificate.

On the front, if you add a route to configurable-http-proxy with

curl -X POST http://localhost:8001/api/routes/test12 -d '{"target":""}'
on the worker, we receive a request to /test12 So, with ttyd, we have to ttyd -b /test12 -p 35422 command.

If you add a route to https and use ttyd with cert, it's doesn't work.


Each time you modify Javascript or ReactJS, you need to do a yarn encore dev All JS code is in the asset directory.


Version 16.8 minimum because some script uses Hooks ( All codes are not translate to use Hooks.