As an alternative to mounting full /dev/dri, there are symlinks under /dev/dri/by-path/ which you can use. IIUC they are linked by the used PCI slot, hence should be as stable as the physical order of the cards.

I use this pattern in a compose file:

...
devices:
  - source: /dev/dri/by-path/pci-XXX-render
    target: /dev/dri/renderD128
    permissions: rwm

In case you are unaware, friends don’t let friends use ollama. The llama.cpp CLI has become pretty much equally easy to use, plus since you use Docker there’s no need to compile anything.

Edit: typos and missing words