WARNING: Linuxserver Labs images are not production ready and we do not provide support for them. They are experimental and could change/break at any time. Please do not deploy them anywhere important

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-labs/nomacs

nomacs is a free, open source image viewer, which supports multiple platforms. You can use it for viewing all common image formats including RAW and psd images.

Supported Architectures

Our images support multiple architectures such as x86-64 and arm64. 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-labs/nomacs: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	✅	latest
arm64	✅	latest

Application Setup

The webui will be accessible at http://SERVERIP:3000 or https://SERVERIP:3001

Options in all KasmVNC based GUI containers

This container is based on Docker Baseimage KasmVNC which means there are additional environment variables and run configurations to enable or disable specific functionality.

Optional environment variables

Variable	Description
CUSTOM_PORT	Internal port the container listens on for http if it needs to be swapped from the default 3000.
CUSTOM_HTTPS_PORT	Internal port the container listens on for https if it needs to be swapped from the default 3001.
CUSTOM_USER	HTTP Basic auth username, abc is default.
PASSWORD	HTTP Basic auth password, abc is default. If unset there will be no auth
SUBFOLDER	Subfolder for the application if running a subfolder reverse proxy, need both slashes IE /subfolder/
TITLE	The page title displayed on the web browser, default "KasmVNC Client".
FM_HOME	This is the home directory (landing) for the file manager, default "/config".
START_DOCKER	If set to false a container with privilege will not automatically start the DinD Docker setup.
DRINODE	If mounting in /dev/dri for DRI3 GPU Acceleration allows you to specify the device to use IE /dev/dri/renderD128

Optional run configurations

Variable	Description
--privileged	Will start a Docker in Docker (DinD) setup inside the container to use docker in an isolated environment. For increased performance mount the Docker directory inside the container to the host IE -v /home/user/docker-data:/var/lib/docker.
-v /var/run/docker.sock:/var/run/docker.sock	Mount in the host level Docker socket to either interact with it via CLI or use Docker enabled applications.
--device /dev/dri:/dev/dri	Mount a GPU into the container, this can be used in conjunction with the DRINODE environment variable to leverage a host video card for GPU accelerated appplications. Only Open Source drivers are supported IE (Intel,AMDGPU,Radeon,ATI,Nouveau)

Lossless mode

This container is capable of delivering a true lossless image at a high framerate to your web browser by changing the Stream Quality preset to "Lossless", more information here. In order to use this mode from a non localhost endpoint the HTTPS port on 3001 needs to be used. If using a reverse proxy to port 3000 specific headers will need to be set as outlined here.

Usage

Here are some example snippets to help you get started creating a container.

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

---
version: "2.1"
services:
  nomacs:
    image: lscr.io/linuxserver-labs/nomacs:latest
    container_name: nomacs
    security_opt:
      - seccomp:unconfined #optional
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Europe/London
    ports:
      - 3000:3000
      - 3001:3001
    volumes:
      - /path/to/appdata:/config
    restart: unless-stopped

docker cli (click here for more info)

docker run -d \
  --name=nomacs \
  --security-opt seccomp=unconfined `#optional` \
  -e PUID=1000 \
  -e PGID=1000 \
  -e TZ=Europe/London \
  -p 3000:3000 \
  -p 3001:3001 \
  -v /path/to/appdata:/config \
  --restart unless-stopped \
  lscr.io/linuxserver-labs/nomacs:latest

Parameters

Container images 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
-e PUID=1000	for UserID - see below for explanation
-e PGID=1000	for GroupID - see below for explanation
-e TZ=Europe/London	Specify a timezone to use EG Europe/London.
-p 3000	The webui http port.
-p 3001	The webui https port.
-v /config	The folder on host you'd like the app data to reside in.
--security-opt seccomp=unconfined	For Docker Engine only, many modern gui apps need this to function as syscalls are unkown to Docker.

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__PASSWORD=/run/secrets/mysecretpassword

Will set the environment variable PASSWORD based on the contents of the /run/secrets/mysecretpassword 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 user as below:

  $ id username
    uid=1000(dockeruser) gid=1000(dockergroup) groups=1000(dockergroup)

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 nomacs /bin/bash
• To monitor the logs of the container in realtime: docker logs -f nomacs
• container version number
  • docker inspect -f '{{ index .Config.Labels "build_version" }}' nomacs
• image version number
  • docker inspect -f '{{ index .Config.Labels "build_version" }}' lscr.io/linuxserver-labs/nomacs

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 (ie. nextcloud, plex), 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 all images: docker-compose pull
  • or update a single image: docker-compose pull nomacs
• Let compose update all containers as necessary: docker-compose up -d
  • or update a single container: docker-compose up -d nomacs
• You can also remove the old dangling images: docker image prune

Via Docker Run

• Update the image: docker pull lscr.io/linuxserver-labs/nomacs
• Stop the running container: docker stop nomacs
• Delete the container: docker rm nomacs
• 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

Via Watchtower auto-updater (only use if you don't remember the original parameters)

• Pull the latest image at its tag and replace it with the same env variables in one run:

  docker run --rm \
  -v /var/run/docker.sock:/var/run/docker.sock \
  containrrr/watchtower \
  --run-once nomacs

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

Note: We do not endorse the use of Watchtower as a solution to automated updates of existing Docker containers. In fact we generally discourage automated updates. However, this is a useful tool for one-time manual updates of containers where you have forgotten the original parameters. In the long term, we highly recommend using Docker Compose.

Image Update Notifications - Diun (Docker Image Update Notifier)

• 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-labs/docker-nomacs.git
cd docker-nomacs
docker build \
  --no-cache \
  --pull \
  -t lscr.io/linuxserver-labs/nomacs: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

• 11.02.24: - Add PWA icon, rely on baseimage's fullscreen fix.
• 10.05.23: - Build commits from upstream master branch.
• 27.03.23: - Rebase to the new kasmvnc baseimage. Deprecate arm32v7 build as the new base does not support it.
• 10.12.22: - Add support for AVIF and JPEG XL.
• 12.10.22: - Initial Release.