diskimage-builder/elements/enable-serial-console/README.rst

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enable-serial-console
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Start getty on active serial consoles.
With ILO and other remote admin environments, having a serial console can be
useful for debugging and troubleshooting.
For upstart:
If ttyS1 exists, getty will run on that, otherwise on ttyS0.
For systemd:
We dynamically start a getty on any active serial port via udev rules.