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5andr0
Asked: 2024-11-13 04:51:34 +0800 CST

/dev/kvm in docker swarm service

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I'd like to run multiple docker-android instances in docker swarm. But they fail:

ERROR   | x86 emulation currently requires hardware acceleration!
https://developer.android.com/studio/run/emulator-acceleration#vm-linux
CPU acceleration status: /dev/kvm is not found: VT disabled in BIOS or KVM kernel module not loaded

My node supports kvm and running directly on the node with docker compose when adding privileged: true works fine.
But docker swarm doesn't support privileged mode!
They recently added cap_add support in swarm, so I tried to add all available caps, but none of them enables kvm inside the container.

Devices is also not supported in swarm mode!

devices:
      - "/dev/kvm:/dev/kvm"

I know about this workaround for priviledge mode, but I want to make use of the deploy resources limits to auto select nodes based on memory.

I need a solution fast, so I will open a bounty.
I'm open for any hacky way or sth like docker forks which support this

docker

1 Answers

  1. Best Answer

    One workaround would be to deploy https://github.com/allfro/device-mapping-manager and then just mount /dev/kvm and let the manager fix cgroups automatically

    volumes:
  - "/dev/kvm:/dev/kvm"

    Bounty will still be open for a better solution

    • 0