The LinuxServer.io team brings you another container release featuring:

regular and timely application updates
easy user mappings (PGID, PUID)
custom base image with s6 overlay
weekly base OS updates with common layers across the entire LinuxServer.io ecosystem to minimise space usage, down time and bandwidth
regular security updates

Find us at:

Blog - all the things you can do with our containers including How-To guides, opinions and much more!
Discord - realtime support / chat with the community and the team.
Discourse - post on our community forum.
Fleet - an online web interface which displays all of our maintained images.
GitHub - view the source for all of our repositories.
Open Collective - please consider helping us by either donating or contributing to our budget

linuxserver/emulatorjs

Emulatorjs - In browser web based emulation portable to nearly any device for many retro consoles. A mix of emulators is used between Libretro and EmulatorJS.

Supported Architectures

We utilise the docker manifest for multi-platform awareness. More information is available from docker here and our announcement here.

Simply pulling lscr.io/linuxserver/emulatorjs:latest should retrieve the correct image for your arch, but you can also pull specific arch images via tags.

The architectures supported by this image are:

Architecture	Available	Tag
x86-64	✅	amd64-<version tag>
arm64	✅	arm64v8-<version tag>
armhf	❌

Application Setup

The Backend can be accessed at:

http://yourhost:3000/

The first thing you will need to do is click to download the default art/configs from this interface, this will setup a skeleton directory in your /data mount. From there add roms to the respective roms directories and follow the on screen instructions to add them to your web frontend running on port 80.

The frontend application has been initially optimized around being used with a standard gamepad (more specifically for modern Xbox consoles that have chromium based Edge browsers). The navigation revolves around the up/down/left/right keys to browse the menus and launch games. Mobile browsers will function, just keep in mind compatibility will be reduced especially for CD based games.

I understand there may be some confusion as to project naming, but when this project (linuxserver/emulatorjs) started it was meant to be a simple frontend for self hosting folks to use the at the time deobfuscated code of https://www.emulatorjs.com/ that ethanaobrien was working on. Since then EmulatorJS has evolved into it's own amazing project based on Libretro cores that have been highly optimized to function for web. This project mostly contains custom built libretro cores found here. So in general despite the naming of this project and the logo this is just a docker container with a web based backend for generating a useable self hosted emulation website and is in no way affiliated with EmulatorJS.

For Xbox users please click the select button a couple times after launching a game to ensure the B button does not trigger a "back" action in the browser. (official name "view button" it is the two small squares) Exiting the controller mode and back to browser controls can be triggered by holding the start button for 3 seconds. (official name "menu button" the three lines) You will be unable to use features like save states and modify controller layouts on the emulatorjs based emulators currently as I have not determined a methodology of re-entering controller mode once you exit it. All normal game saves will function given you exit the game play screen cleanly using the B button for back this includes multi disc games for psx. Your game saves are stored in browser storage by hostname so if you make any changes to your local hosted setup (port or IP) the saves will not follow with it. For libretro based emulators you can use the button combination start+select+L+R to access the libretro menu and change settings/save or load/etc.

We know about most of the oddities like crackling sound for some emulators, rendering issues, and games unreliably auto launching to fullscreen. In general full CD games on the Xbox web browser do not seem to work due to their size if you have a chd/pbp less than 450 megs it will run. Edge on Xbox has some kind of undocumented ram limitation of about a gigabyte. Until all emulators are transitioned to libretro cores the oddities of using self hosted EmulatorJS will not be something that can or should be solved using hacky workarounds interacting with obfuscated code. Just keep in mind these are full blown machine emulators running in Javascript in a browser, do not expect bare metal performance.

This container (outside of the profile functionality) only generates a static set of files that can be hosted on any web provider even object storage. Eveyrthing runs in the clients browser and there are no dependencies on this container. To extract/copy this website it is at the path /emulatorjs/frontend inside the container. If you are happy with the catalouge you have created and no longer want to run stuff like the IPFS backend or want to upload these files to some other hosting provider you can simply copy the contents of that directory and kill off this container. This container can also be started without IPFS once you collection is set using the environment variable -e DISABLE_IPFS=true.

Mounting in existing rom directories Read Only can be achieved by using a special root path /roms, For example for NES:

-v /path/to/nes/roms:/roms/nes:ro

The folder names for systems are:

3do
arcade
atari2600
atari5200
atari7800
colecovision
doom
gb
gba
gbc
jaguar
lynx
msx
n64
nds
nes
ngp
odyssey2
pce
psx
sega32x
segaCD
segaGG
segaMD
segaMS
segaSaturn
segaSG
snes
vb
vectrex
ws

Usage

To help you get started creating a container from this image you can either use docker-compose or the docker cli.

docker-compose (recommended, click here for more info)

---
services:
  emulatorjs:
    image: lscr.io/linuxserver/emulatorjs:latest
    container_name: emulatorjs
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Etc/UTC
      - SUBFOLDER=/ #optional
    volumes:
      - /path/to/config:/config
      - /path/to/data:/data
    ports:
      - 3000:3000
      - 80:80
      - 4001:4001 #optional
    restart: unless-stopped

docker cli (click here for more info)

docker run -d \
  --name=emulatorjs \
  -e PUID=1000 \
  -e PGID=1000 \
  -e TZ=Etc/UTC \
  -e SUBFOLDER=/ `#optional` \
  -p 3000:3000 \
  -p 80:80 \
  -p 4001:4001 `#optional` \
  -v /path/to/config:/config \
  -v /path/to/data:/data \
  --restart unless-stopped \
  lscr.io/linuxserver/emulatorjs:latest

Parameters

Containers are configured using parameters passed at runtime (such as those above). These parameters are separated by a colon and indicate <external>:<internal> respectively. For example, -p 8080:80 would expose port 80 from inside the container to be accessible from the host's IP on port 8080 outside the container.

Parameter	Function
`-p 3000`	Rom/artwork management interface, used to generate/manage config files and download artwork
`-p 80`	Emulation frontend containing static web files used to browse and launch games
`-p 4001`	IPFS peering port, if you want to participate in the P2P network to distribute frontend artwork please forward this to the Internet
`-e PUID=1000`	for UserID - see below for explanation
`-e PGID=1000`	for GroupID - see below for explanation
`-e TZ=Etc/UTC`	specify a timezone to use, see this list.
`-e SUBFOLDER=/`	Specify a subfolder for reverse proxies IE '/FOLDER/'
`-v /config`	Path to store user profiles
`-v /data`	Path to store roms/artwork

Environment variables from files (Docker secrets)

You can set any environment variable from a file by using a special prepend FILE__.

As an example:

-e FILE__MYVAR=/run/secrets/mysecretvariable

Will set the environment variable MYVAR based on the contents of the /run/secrets/mysecretvariable file.

Umask for running applications

For all of our images we provide the ability to override the default umask settings for services started within the containers using the optional -e UMASK=022 setting. Keep in mind umask is not chmod it subtracts from permissions based on it's value it does not add. Please read up here before asking for support.

User / Group Identifiers

When using volumes (-v flags), permissions issues can arise between the host OS and the container, we avoid this issue by allowing you to specify the user PUID and group PGID.

Ensure any volume directories on the host are owned by the same user you specify and any permissions issues will vanish like magic.

In this instance PUID=1000 and PGID=1000, to find yours use id your_user as below:

id your_user

Example output:

uid=1000(your_user) gid=1000(your_user) groups=1000(your_user)

Docker Mods

We publish various Docker Mods to enable additional functionality within the containers. The list of Mods available for this image (if any) as well as universal mods that can be applied to any one of our images can be accessed via the dynamic badges above.

Support Info

Shell access whilst the container is running:
```
docker exec -it emulatorjs /bin/bash
```
To monitor the logs of the container in realtime:
```
docker logs -f emulatorjs
```

Container version number:

docker inspect -f '{{ index .Config.Labels "build_version" }}' emulatorjs

Image version number:

docker inspect -f '{{ index .Config.Labels "build_version" }}' lscr.io/linuxserver/emulatorjs:latest

Updating Info

Most of our images are static, versioned, and require an image update and container recreation to update the app inside. With some exceptions (noted in the relevant readme.md), we do not recommend or support updating apps inside the container. Please consult the Application Setup section above to see if it is recommended for the image.

Below are the instructions for updating containers:

Via Docker Compose

Update images:

All images:
```
docker-compose pull
```
Single image:
```
docker-compose pull emulatorjs
```

Update containers:

All containers:
```
docker-compose up -d
```
Single container:
```
docker-compose up -d emulatorjs
```

You can also remove the old dangling images:
```
docker image prune
```

Via Docker Run

Update the image:

docker pull lscr.io/linuxserver/emulatorjs:latest

Stop the running container:
```
docker stop emulatorjs
```
Delete the container:
```
docker rm emulatorjs
```
Recreate a new container with the same docker run parameters as instructed above (if mapped correctly to a host folder, your /config folder and settings will be preserved)
You can also remove the old dangling images:
```
docker image prune
```

Image Update Notifications - Diun (Docker Image Update Notifier)

tip: We recommend Diun for update notifications. Other tools that automatically update containers unattended are not recommended or supported.

Building locally

If you want to make local modifications to these images for development purposes or just to customize the logic:

git clone https://github.com/linuxserver/docker-emulatorjs.git
cd docker-emulatorjs
docker build \
  --no-cache \
  --pull \
  -t lscr.io/linuxserver/emulatorjs:latest .

The ARM variants can be built on x86_64 hardware using multiarch/qemu-user-static

docker run --rm --privileged multiarch/qemu-user-static:register --reset

Once registered you can define the dockerfile to use with -f Dockerfile.aarch64.

Versions

27.01.24: - Add atari5200 support.
24.01.24: - Pin node back on aarch64 as well for compatibility.
23.01.24: - Add logic to symlink out RO rom directories to support upgrades.
14.01.24: - Update remaining cores for melonds and yabause threaded to fix audio issues.
11.01.24: - Use Node 16 on x86 image to restore metadata uploads in backend, update psx core to current.
07.01.24: - Update to use new Mupen64 plus core by default.
06.01.24: - Update many emulators to fix audio issues and use latest codebases.
29.12.23: - Rebase to Alpine 3.19, add option to launch without IPFS.
09.08.23: - Rebase to Alpine 3.18, migrate to s6v3.
06.07.23: - Deprecate armhf. As announced here
24.11.22: - Update IPFS links for chdman.
04.04.22: - Ingest pre-built chdman bins during build time.
23.02.22: - Update ingestion point for emulatorjs bins.
25.01.22: - Allow users to mount in existing rom directories.
14.01.22: - Add profile paths and rebase to Alpine 3.15.
04.01.22: - Add headers needed for Threaded emulators.
29.11.21: - Add wasm mime type to NGINX.
26.11.21: - Configure IPFS in a lower power mode, use homebuilt blobs for emu cores.
19.11.21: - Pin retroarch version.
14.11.21: - Update default cores to ingest.
23.10.21: - Initial release.

hulkhaugen/docker-emulatorjs