原文转自：http://blog.csdn.net/g__gle/article/details/8663239

1) Create a file called /etc/init/ttyS0.conf

# ttyS0 - getty

#

# This service maintains a getty on ttyS0 from the point the system is

# started until it is shut down again.

start on stopped rc RUNLEVEL=[2345] and (

            not-container or

            container CONTAINER=lxc or

            container CONTAINER=lxc-libvirt)

stop on runlevel [!2345]

respawn

exec /sbin/getty -L 115200 ttyS0 vt102

2) Ask upstart to start the getty

sudo start ttyS0