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Automatically load required kernel modules

Credit to Andy Neff @andyneff for this idea.

As noted in the README, the Docker host kernel needs a few modules for proper operation of an NFS server. You can manually enable these on the host - i.e. with modprobe - or you can allow the container to do this on your behalf. Here's how:

  1. Add --cap-add SYS_MODULE to your Docker run command to allow the container to load/unload kernel modules.
  2. Bind-mount the Docker host's /lib/modules directory into the container. e.g. -v /lib/modules:/lib/modules:ro

Here's an example docker-compose.yml:

version: 3
services:
  nfs:
    image: erichough/nfs-server
    volumes:
      - /path/to/share:/nfs
      - /path/to/exports.txt:/etc/exports:ro
      - /lib/modules:/lib/modules:ro
    cap_add:
      - SYS_ADMIN
      - SYS_MODULE
    ports:
      - 2049:2049