Disable console over Serial in Dev on RPi3?

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Hi everyone.
Necroposting here to let people know that I found a way to disable the console over the serial port directly from a docker container.

Long story short:

  1. Either add a new service or merge this with an existing one in docker-compose.yml:
    environment:
      - 'DBUS_SYSTEM_BUS_ADDRESS=unix:path=/host/run/dbus/system_bus_socket'
    labels:
      io.balena.features.dbus: '1'
  1. Add dbus to your Dockerfile:
RUN install_packages dbus
  1. Run the following commands at runtime inside the container:
DBUS_SYSTEM_BUS_ADDRESS=unix:path=/host/run/dbus/system_bus_socket \
  dbus-send \
  --system \
  --print-reply \
  --dest=org.freedesktop.systemd1 \
  /org/freedesktop/systemd1 \
  org.freedesktop.systemd1.Manager.MaskUnitFiles \
  array:string:"serial-getty@serial0.service" \
  boolean:true \
  boolean:true

DBUS_SYSTEM_BUS_ADDRESS=unix:path=/host/run/dbus/system_bus_socket \
  dbus-send \
  --system \
  --print-reply \
  --dest=org.freedesktop.systemd1 \
  /org/freedesktop/systemd1 \
  org.freedesktop.systemd1.Manager.StopUnit \
  string:"serial-getty@serial0.service" \
  string:replace

You can find a fully working example in this repository, as well as documentation and more in depth explanations:

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