RB5009-Doom

Run Chocolate Doom on a MikroTik RB5009 in a container, accessible via KasmVNC (browser) or X11 forwarding with Xephyr.

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1. Container Setup on the RB5009

It's best to use external storage for the container root directory.

/container/config set registry-url=https://ghcr.io
/container add name=Doom remote-image=linuxserver/baseimage-kasmvnc:alpine320 root-dir=your_root_dir interface=veth1 logging=yes

2. Start and Enter the Container

/container start Doom
/container shell Doom

3. Initial Configuration (inside container)

The default user is abc. Adjust permissions and set a password:

chown -R abc:abc /root
sudo passwd abc

Disconnect with Ctrl+D / ^D.

4. Restart the Container

/container stop Doom
/container start Doom

At this point KasmVNC is accessible at http://<veth1-ip>:3000.

5. Install SSH and Xauth

/container start Doom

# Inside the container
sudo apk add openssh xauth

# Prep xauth
touch /config/.Xauthority
export XAUTHORITY=/config/.Xauthority

# Configure sshd
sudo ssh-keygen -A

# Enable X11 forwarding
sudo sed -i 's/#X11Forwarding.*/X11Forwarding yes/' /etc/ssh/sshd_config
grep -q '^X11Forwarding yes' /etc/ssh/sshd_config || echo "X11Forwarding yes" | sudo tee -a /etc/ssh/sshd_config

# Start the daemon
sudo /usr/sbin/sshd

6. Restart the Container

/container stop Doom
/container start Doom

Continue in the terminal window or via SSH to the container — your choice.

7. Build Chocolate Doom

Install build tools and clone the source:

sudo apk add build-base cmake git sdl2-dev sdl2_mixer-dev sdl2_net-dev libpng-dev libsamplerate-dev

cd /tmp
git clone --depth 1 https://github.com/chocolate-doom/chocolate-doom.git
cd chocolate-doom
cmake -B build
cmake --build build -j"$(nproc)" --target chocolate-doom

8. Install Xephyr (Host PC)

On Fedora (adjust for your distro):

dnf install Xephyr

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Playing Doom

1. Start the container in WinBox/WebUI on the RB5009.

   • Open the container terminal as root and run: /usr/sbin/sshd -D -e &
   • Note the veth1 IP address.

2. On your host PC, open a terminal and run:

   Xephyr :1 -screen 800x600 &
   DISPLAY=:1 ssh -Y -R /tmp/pulse.sock:$XDG_RUNTIME_DIR/pulse/native abc@{containerIp}

   You should now have an 800×600 Xephyr window and an SSH session into the container.

3. Start Doom:

   cd /tmp/chocolate-doom/build/src
   PULSE_SERVER=unix:/tmp/pulse.sock ./chocolate-doom -iwad {wadFile}

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Other Games Tested

The following games have been tested and work on the same container setup:

Game	Engine
Descent	dxx-rebirth
Diablo 1	devilutionX
Duke Nukem 3D	eDuke32
Quake	tyrquake
Super Mario 64	sm64ex
Unreal Tournament	469e ARM64 patch

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Acknowledgments

Original inspiration and guidance from the MikroTik forum thread:
Running GUI apps in container