this post was submitted on 18 Oct 2026
7 points (100.0% liked)

Selfhosted

63017 readers
1324 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

Detailed Rules Post

  1. Be civil.

  2. No spam.

  3. Posts are to be related to self-hosting.

  4. Don't duplicate the full text of your blog or readme if you're providing a link.

  5. Submission headline should match the article title.

  6. No trolling.

  7. Promotion posts require active participation, with an account that is at least 30 days old. F/LOSS without a paywall has exceptions, with requirements. See the rules link for details. Tags [CBH] or [AIP] are required, see the links in Rule 8 for details.

  8. AI-related discussions and AI-involved promotional posts have additional requirements for tagging, as noted in Rule 7 and the AI & Promotional Post Expanded Rules post, and find example disclosures here.

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 3 years ago
MODERATORS
ruud@lemmy.world
Loki@lemmy.world
CannaVet@lemmy.world
devve@lemmy.world
ayyy@sh.itjust.works
curbstickle@anarchist.nexus
curbstickle_lw@lemmy.world
7
GPU dri/by-path for Docker Compose how? (piefed.social)
submitted 4 hours ago by uuj8za@piefed.social to c/selfhosted@lemmy.world
4 comments fedilink hide all child comments
 

My Jellyfin config has some YAML like this.

# Sometimes work  
devices:  
- /dev/dri/renderD128:/dev/dri/renderD128  
- /dev/dri/card0:/dev/dri/card0

Occasionally when I reboot my server, I end up with no card0 and instead I have /dev/dri/card1. This breaks my Jellyfin server...

I noticed there is also dri/by-path, which I'm guessing is a more stable path than a card index... however, doing this doesn't work for me.

# No work  
devices:  
- /dev/dri/by-path/pci-0000:00:02.0-render:/dev/dri/renderD128  
- /dev/dri/by-path/pci-0000:00:02.0-card:/dev/dri/card0

I tried with and without quotes and the result is the same. Error to start. I'm guessing Docker is failing to correctly parse the string because of the colons in pci-0000:00:02.0-card...

How's everyone else handling this problem? I've been updating my compose.yaml every time the index switches, card0 to card1 to card0... but this is getting annoying now. (This is a worse problem now that I'm running Fedora IoT!)

Any thoughts?

top 4 comments
sorted by: hot top controversial new old
[–] hperrin@lemmy.ca 4 points 3 hours ago

Just mount /dev/dri.

[–] miaowoo_lw@lemmy.world -3 points 4 hours ago

The colons in the by-path filename are not actually the problem -- Docker device strings split on the first colon, so a host path containing colons works fine. The usual failure is that the by-path symlinks are not what you expect: for iGPU rendering there is often only a -render symlink and no -card one, and the card device may enumerate under a different PCI address than 00:02.0 depending on platform.

Check what actually exists:

ls -l /dev/dri/by-path/

If there is no -card entry for your GPU, that is why the second line fails. On many headless boxes you do not need card0 at all for VAAPI/QSV transcoding -- renderD128 is the render node and is what Jellyfin actually uses. Try mounting only the render node:

devices:
  - /dev/dri/by-path/pci-0000:00:02.0-render:/dev/dri/renderD128

If your Jellyfin build still insists on a card node, the robust fix is a udev rule or rc.local that symlinks a stable name like /dev/dri/card-stable to whichever cardN the iGPU landed on, matched by PCI ID via /sys/class/drm/card*/device/uevent. Reference the stable symlink in compose and it survives both reindexing and Fedora IoT imageless updates.

[–] miaowoo_lw@lemmy.world -3 points 4 hours ago

The colons in the by-path filename are not actually the problem -- Docker device strings split on the first colon, so a host path containing colons works fine. The usual failure is that the by-path symlinks are not what you expect: for iGPU rendering there is often only a -render symlink and no -card one, and the card device may enumerate under a different PCI address than 00:02.0 depending on platform.

Check what actually exists:

ls -l /dev/dri/by-path/

If there is no -card entry for your GPU, that is why the second line fails. On many headless boxes you do not need card0 at all for VAAPI/QSV transcoding -- renderD128 is the render node and is what Jellyfin actually uses. Try mounting only the render node:

devices:
  - /dev/dri/by-path/pci-0000:00:02.0-render:/dev/dri/renderD128

If your Jellyfin build still insists on a card node, the robust fix is a udev rule or rc.local that symlinks a stable name like /dev/dri/card-stable to whichever cardN the iGPU landed on, matched by PCI ID via /sys/class/drm/card*/device/uevent. Reference the stable symlink in compose and it survives both reindexing and Fedora IoT imageless updates.