All credit goes to trapexit/mergerfs.

If you are here, then you are most likely looking for a simple solution to fuse multiple hard drives' contents to a single mountpoint using mergerfs and docker. There are multiple containers which dockerize mergerfs, however none are regularly updated, with open-sourced dockerfiles (no crypto-miners) and simple to use. This repository attempts to do just that. Simply mount your hard drives as volumes to /disks and mergerfs will make them available under /merged. Exposing the /merged volume to host, you need to use :shared bind to share it between the container and host. Change the volume path on the host to your prefered location and that's it!

Docker run:

docker run -v /mnt/nd1:/disks/nd1 -v /mnt/nd2:/disks/nd2 -v /mnt/nd3:/disks/nd3 -v /mnt/merged:/merged:shared --device /dev/fuse --cap-add SYS_ADMIN -d hvalev/mergerfs

docker-compose:

services: mergerfs: image: hvalev/mergerfs:latest container_name: mergerfs cap_add: - SYS_ADMIN devices: - /dev/fuse:/dev/fuse volumes: - /mnt/nd1:/disks/nd1 - /mnt/nd2:/disks/nd2 - /mnt/nd3:/disks/nd3 - /mnt/merged:/merged:shared restart: always

• If you would like to customize the mergerfs command with additional options, you can overwrite parameters.conf with your own using an additional volume mount that maps onto /config inside the docker. You can use the one in the repo as a template.
• You can also override the default mergerfs parameters by using the MERGERFS_PARAMS environment variable as follows:

services: mergerfs: image: hvalev/mergerfs:latest container_name: mergerfs environment: MERGERFS_PARAMS: 'moveonenospc=true,dropcacheonclose=true,category.create=mfs,cache.files=partial' cap_add: - SYS_ADMIN devices: - /dev/fuse:/dev/fuse volumes: - /mnt/nd1:/disks/nd1 - /mnt/nd2:/disks/nd2 - /mnt/nd3:/disks/nd3 - /mnt/merged:/merged:shared restart: always

• If you would like to combine this with samba to share it over the network, you could also use a samba docker container. Below is an example with a sample user read-write and guest read-only access.

services: mergerfs: image: hvalev/mergerfs:latest container_name: mergerfs environment: MERGERFS_PARAMS: 'moveonenospc=true,dropcacheonclose=true,category.create=mfs,cache.files=partial' cap_add: - SYS_ADMIN devices: - /dev/fuse:/dev/fuse volumes: - /mnt/hd1:/disks/hd1 - /mnt/hd2:/disks/hd2 - /mnt/hd3:/disks/hd3 - /mnt/hd:/merged:shared restart: always samba: image: elswork/samba:3.2.8 container_name: samba environment: TZ: 'Europe/Amsterdam' ports: - 139:139 - 445:445 volumes: - /mnt/hd:/mnt/hd command: '-u "1000:1000:user:user:user_password"   -u "1000:1000:guest:guest:guest_password"  -s "hd:/mnt/hd:rw:user"  -s "media:/mnt/hd:ro:guest"' restart: unless-stopped depends_on: - mergerfs

The following resources have been extremely helpful:

• https://hub.docker.com/r/ojford/mergerfs
• https://perfectmediaserver.com/tech-stack/mergerfs.html
• https://github.com/homespirit/mergerfs-docker

mergerfs itself has the following licence:

/* ISC License Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link> Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ 

https://github.com/trapexit/mergerfs/blob/master/LICENSE