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Allowing root login to remote consoles via serial tty
This page describes how to configure root login to serial attached ttys. Which is by default disabled.
Concept
By default only devices listed in /etc/securetty are allowed to login. In order to allow a not listed device do as follows.
Edit the file /etc/securetty and add the device without leading /dev part.
Example
If you cannot login to a node via remote console which is attached over serial (ttyS0). Do as follows:
echo ttyS0 >> /etc/securetty
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