Cannot connect to server in Open OnDemand

[jasonleekungfu]

High-level description

I am trying to develop an Open OnDemand (OOD) app for ParaViewWeb (Visualizer, Divvy, Lite). I was able to create a Singularity image with ParaView 5.12.1 (headless) package and a working OOD app running this image. I was able to successfully submit a job on cluster, and see ParaViewWeb service correctly running. However, when I tried to connect to Visualizer, the "Loading ParaView" logo flashed and disappeared. Nothing happens. Similar issue also happened to Divvy and Lite, presumably somehow the app was not correctly talking to the service.

I tried ssh tunneling from local machine to the node and was able to successfully launch the app in browser by visiting "localhost". So it looks like the service is correctly running. But OOD was not able to talk to it correctly.

Steps to reproduce

This is the line to run the service once job starts (port is correct):
singularity exec -B /work,/project,/usr/local/packages,/var/scratch /project/containers/images/paraviewweb-5.12.1.sif pvpython -m paraview.apps.visualizer --host 0.0.0.0 --port ${port} --timeout 0 -d

Detailed behavior

This is the output (debug) once a job starts:

When I tried to connect it in OOD, nothing changed in above output. As I described before, in browser, the "Loading ParaView" logo flashed and disappeared. The page is blank.

When I set up ssh tunneling and visited "localhost", the app was successfully launched. And I see below debug output:

So it looks like in OOD, it was unable to correctly talk to the service.

Expected behavior

OOD should be able to launch the app in browser.

Environment

• Visualizer: (Whatever version comes with ParaView 5.12.1 headless egl)
• OS: RHEL 8.1
• Browser: Chrome

[jasonleekungfu]

Any help is appreciated. Thank you very much!

[jourdain]

I'm really not sure what could be happening. Any log in the browser dev console? In the network tab of the dev console? That might give us a hint on what could be happening.

I'll be at SuperComputing in Altlanta next week in case you or someone from your team wants to chat.

[jasonleekungfu]

Thank you for the prompt response. I will have to try it again and see if I find anything in dev console.

I am at SC as well. What is the best way to connect?

[jourdain]

You can stop by at the Kitware booth and ask for me. (Tuesday through Thursday)

[jasonleekungfu]

Great! Will do! Thank you very much!

BTW I just checked and it looks like an issue with ws:

Visualizer.js:1 Mixed Content: The page at 'https://ondemand.qbd.loni.org/XXX/XXX/XXXXX/index.html' was loaded over HTTPS, but attempted to connect to the insecure WebSocket endpoint 'ws://ondemand.qbd.loni.org/ws'. This request has been blocked; this endpoint must be available over WSS.

Any thoughts on this?

[jourdain]

https://discourse.paraview.org/t/enabling-wss-for-paraview-visualiser/15692/5

[jasonleekungfu]

Oh great! It worked! Thank you very much!

I read through the thread. Well I guess I will find you at your booth anyways. :) Thank you very much!