[way around] no screen/black screen after login - no logs (docker image on qnap NAS - container station)

[accetto]

[way around] no screen/black screen after login - no logs (docker image on qnap NAS - container station)

[accetto]

Unfortunately I have to confirm this problem with the G3 containers and the Container Station on QNAP NAS devices.

I don't want to speculate about the reason until I do more testing.

As a way around you can use my older G2 or G1 images. They do work also on QNAP NAS devices.

This is the simple Container Station application I've used for testing:

### app name: app-qnap-test
version: "3"
services:
  firefox-g3:
    image: accetto/ubuntu-vnc-xfce-firefox-g3:latest
    ports:
      - "35940:5901"
      - "35941:6901"
  firefox-g2:
    image: accetto/xubuntu-vnc-novnc-firefox:latest
    ports:
      - "35942:5901"
      - "35943:6901"
  firefox-g1:
    image: accetto/ubuntu-vnc-xfce-firefox-plus:latest
    ports:
      - "35944:5901"
      - "35945:6901"

You can connect to the containers using your web browser like this:

http://<your-nas-ip>:35941
http://<your-nas-ip>:35943
http://<your-nas-ip>:35945

The first container will show only a black-screen, but the other two should work.

[accetto]

FYI: Test 1
Increasing shared memory like this didn't help.

version: "3"
services:
  firefox-g3:
    image: accetto/ubuntu-vnc-xfce-firefox-g3:latest
    ports:
      - "35940:5901"
      - "35941:6901"
    shm_size: "256m"

[accetto]

FYI: Test 2
Making the container privileged did help, so it seems to be related to the permissions on QNAP.

The following G3 container should work:

version: "3"
services:
  firefox-g3:
    image: accetto/ubuntu-vnc-xfce-firefox-g3:latest
    ports:
      - "35940:5901"
      - "35941:6901"
    shm_size: "256m"
    privileged: true

[accetto]

FYI: Test 3
Pre-creating the network manually didn't help.

The following G3 container will not work:

version: "3"
networks:
  my_test:
    external: true
    name: my_test
services:
  firefox-g3:
    image: accetto/ubuntu-vnc-xfce-firefox-g3:latest
    ports:
      - "35940:5901"
      - "35941:6901"
    networks:
      - my_test

[senza-lattosio]

Sorry for mingling (I'm less than beginner) but I solved this by recreating the container and make it run in "privileged mode".
This way no dark screen.

[accetto]

Not at all, you're welcome. :)
Yes, the priveleged mode helps (see the 'Test 2' above).
Also the G1 and G2 images work.
I hope to spare some time to come to this problem.

[KlausGlueckert]

I can confirm the black screen on my normal ubuntu cloud server (not a qnap)

22.04 --> black screen
20.04 --> works

docker run -d \
    --restart=always \
    --name testvnc \
    --network=nginx-proxy \
    -e VNC_PW=!mypassword! \
     accetto/ubuntu-vnc-xfce-firefox-g3:22.04 --verbose

[accetto]

Hello @KlausGlueckert ,

thank you for your feedback. Which cloud service do you use?

I assume, that the startup script is not allowed to change the permissions of the system files /etc/passwd and /etc/passwd /etc/group on the first start. Cloud environments often restrict such activities.

However, it could be also some other reason. I'm thinking about re-designing the startup sequence sometimes in the future.

Have you checked also the older issues? Maybe you could find a hint.

Regards,
accetto