systemd/units/console-getty.service.m4.in
Jan Pazdziora 1b41981d9a console-getty.service: don't start when /dev/console is missing
Create minimal image which runs systemd

   FROM rhel7.1
   RUN yum install -y /usr/bin/ps
   ENV container docker
   CMD [ "/usr/sbin/init" ]

When you run the container without -t, the process

   /sbin/agetty --noclear --keep-baud console 115200 38400 9600

is not happy and checking the journal in the container, there is a stream of

Mar 13 04:50:15 11bf07f59fff agetty[66]: /dev/console: No such file or directory
Mar 13 04:50:25 11bf07f59fff systemd[1]: console-getty.service holdoff time over, scheduling restart.
Mar 13 04:50:25 11bf07f59fff systemd[1]: Stopping Console Getty...
Mar 13 04:50:25 11bf07f59fff systemd[1]: Starting Console Getty...
Mar 13 04:50:25 11bf07f59fff systemd[1]: Started Console Getty.
Mar 13 04:50:25 11bf07f59fff agetty[67]: /dev/console: No such file or directory
Mar 13 04:50:35 11bf07f59fff systemd[1]: console-getty.service holdoff time over, scheduling restart.
Mar 13 04:50:35 11bf07f59fff systemd[1]: Stopping Console Getty...
Mar 13 04:50:35 11bf07f59fff systemd[1]: Starting Console Getty...
Mar 13 04:50:35 11bf07f59fff systemd[1]: Started Console Getty.
Mar 13 04:50:35 11bf07f59fff agetty[74]: /dev/console: No such file or directory
Mar 13 04:50:45 11bf07f59fff systemd[1]: console-getty.service holdoff time over, scheduling restart.
Mar 13 04:50:45 11bf07f59fff systemd[1]: Stopping Console Getty...
Mar 13 04:50:45 11bf07f59fff systemd[1]: Starting Console Getty...
2015-03-17 12:40:56 +01:00

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# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
[Unit]
Description=Console Getty
Documentation=man:agetty(8)
After=systemd-user-sessions.service plymouth-quit-wait.service
ConditionPathExists=/dev/console
m4_ifdef(`HAVE_SYSV_COMPAT',
After=rc-local.service
)m4_dnl
Before=getty.target
[Service]
ExecStart=-/sbin/agetty --noclear --keep-baud console 115200,38400,9600 $TERM
Type=idle
Restart=always
RestartSec=0
UtmpIdentifier=cons
TTYPath=/dev/console
TTYReset=yes
TTYVHangup=yes
KillMode=process
IgnoreSIGPIPE=no
SendSIGHUP=yes
[Install]
WantedBy=getty.target