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→Ubuntu Core - Quick Guide
== Ubuntu Core - Quick Guide ==
== Enabling the serial console ==
The following instructions show how to enable the serial console (eg: ttyO0)
* Create the /etc/init/serial-auto-detect-console.conf file with the following contents:
<pre>
# serial-auto-detect-console - starts getty on serial console
#
# This service starts a getty on the serial port given in the 'console' kernel argument.
#
start on runlevel [23]
stop on runlevel [!23]
respawn
exec /bin/sh /bin/serial-console
</pre>
* Create the /bin/serial-console file with the following contents:
<pre>
for arg in $(cat /proc/cmdline)
do
case $arg in
console=*)
tty=${arg#console=}
tty=${tty#/dev/}
case $tty in
tty[a-zA-Z]* )
PORT=${tty%%,*}
# check for service which do something on this port
if [ -f /etc/init/$PORT.conf ];then continue;fi
tmp=${tty##$PORT,}
SPEED=${tmp%%n*}
BITS=${tmp##${SPEED}n}
# 8bit serial is default
[ -z $BITS ] && BITS=8
[ 8 -eq $BITS ] && GETTY_ARGS="$GETTY_ARGS -8 "
[ -z $SPEED ] && SPEED='115200,57600,38400,19200,9600'
GETTY_ARGS="$GETTY_ARGS $SPEED $PORT"
exec /sbin/getty $GETTY_ARGS
esac
esac
done
</pre>
* Create the /etc/init/ttyO0.conf file with the following contents:
<pre>
# ttyO0 - getty
#
# This service maintains a getty on ttyO0 from the point the system is
# started until it is shut down again.
start on runlevel [23] and (
not-container or
container CONTAINER=lxc or
container CONTAINER=lxc-libvirt)
stop on runlevel [!23]
respawn
exec /sbin/getty -8 115200 ttyO0
</pre>
