This Dockerfile configures a container to run a VNC server with a customized resolution, scaling, and user account.

Run example

npm run import -- "VNC in Docker"

VNC in Docker

RUN dos2unix /home/seluser/novnc/utils/launch.sh
RUN sed -i -e 's/export GEOMETRY.*/export GEOMETRY="8160x6120x24"/g' /opt/bin/start-xvfb.sh
RUN sed -i -e 's/x11vnc/x11vnc -scale 4080x3060 -noxdamage/g' /opt/bin/start-vnc.sh
RUN sed -i '/wait \$/i/home/seluser/novnc/utils/launch.sh --vnc localhost:5900 &' /opt/bin/entry_point.sh
USER seluser

bash
#!/bin/bash

# Remove Windows line endings from launch.sh using dos2unix
RUN dos2unix /home/seluser/novnc/utils/launch.sh

# Refactor start-xvfb.sh to update geometry
sed -i -e's/export GEOMETRY.*/export GEOMETRY="8160x6120x24"/g' /opt/bin/start-xvfb.sh

# Refactor start-vnc.sh to update scale and disable xdamage
sed -i -e's/x11vnc/x11vnc -scale 4080x3060 -noxdamage/g' /opt/bin/start-vnc.sh

# Refactor entry_point.sh to wait for launch.sh to finish
sed -i '/wait \$/i/home/seluser/novnc/utils/launch.sh --vnc localhost:5900 &' /opt/bin/entry_point.sh

# Set current user to seluser
USER seluser

This code snippet appears to be part of a Dockerfile, used to configure a Docker image for running a VNC server with a specific resolution and some customizations.

Here's a breakdown:

1. RUN dos2unix /home/seluser/novnc/utils/launch.sh:

   • This line converts any DOS-style line endings in the launch.sh script to Unix-style line endings. This is necessary to ensure the script runs correctly on Linux systems.

2. RUN sed -i -e 's/export GEOMETRY.*/export GEOMETRY="8160x6120x24"/g' /opt/bin/start-xvfb.sh:

   • This line uses the sed command to modify the start-xvfb.sh script.
   • It replaces any existing export GEOMETRY line with export GEOMETRY="8160x6120x24". This sets the resolution of the virtual framebuffer to 8160x6120 pixels with 24-bit color depth.

3. RUN sed -i -e 's/x11vnc/x11vnc -scale 4080x3060 -noxdamage/g' /opt/bin/start-vnc.sh:

   • This line modifies the start-vnc.sh script.
   • It replaces any occurrences of x11vnc with x11vnc -scale 4080x3060 -noxdamage.
   • This scales the VNC display to 4080x3060 pixels and disables the noxdamage option, which can improve performance.

4. RUN sed -i '/wait \$/i/home/seluser/novnc/utils/launch.sh --vnc localhost:5900 &' /opt/bin/entry_point.sh:

   • This line inserts a new line into the entry_point.sh script.
   • The new line executes the launch.sh script with the --vnc localhost:5900 argument, which starts the VNC server on port 5900.
   • The & at the end runs the command in the background.

5. USER seluser:

   • This line sets the user to seluser within the Docker container.

In essence, this Dockerfile configures a container to run a VNC server with a specific resolution, scales the display, and sets up a user account for accessing the server.