Hi Nick, thanks for your answer. Yes, I was talking about VNC sessions on Linux. The scenario I have in mind is a cloud deployment with auto-scaling functionality:
There's one instance where guacamole is installed. This instance is small, cheap, and runs 24/7. The applications used in the VNC sessions require decent 3D rendering performance and, thus, I want to host them on GPU instances. These instances are expensive and so I would like to only spin them up when there's demand for a session. I have a mechanism that can submit a script (which creates a VNC session) to a scheduling system (e.g. SLURM). This scheduling system is connected with an autoscaling mechanism, e.g., cfncluster, which starts session host instances if there's demand. The session starts on the new instance, and the session information is added to the guacamole_db. This is why I was thinking the it would be great to have a mechanism to trigger the submission of the session creation script to the scheduling system when a user logs in. As the start of an instance needs a moment, I would like to have some way to inform the user about what's going on in the background. As you confirmed that something like this may work, I'll look a bit more into the Guacamole extension mechanism. Best regards Felix
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