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> Note that console-getty.service as more uses than just containers. The
> idea is that it may be used as alternative to the whole VC/logind stuff,
> if all you need is a console on /dev/console, even on physical devices.
This means we want to remove RestartSec=0, for serial systems.
See 4bf0432 "units/serial-getty@.service: use the default RestartSec".
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Currently we have 4 getty services. 1 has a BindsTo dependency on a
device unit. 3 have ConditionPathExists, but the reason is different in
every single one.
* Add comment to console-getty@.service (see commit 1b41981d)
* getty@.service is already commented
* container-getty.service is not strictly correct, as I realized while
trying to compose a comment. Reported as #6584.
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* Containers don't use serial-getty@console.service,
they use console-getty.service instead, and suppress
scanning for kernel or virtualizer consoles.
* Nowadays gettys are started on *all* configured kernel consoles.
* except for the line printer console, because that's not a tty.
(Seriously. Search CONFIG_LP_CONSOLE).
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Make agetty started by *getty* units pass '-p' option to "login", so it
doesn't clear the environment and passes whatever was setup by systemd
to shells. This is needed especially for programs which are specified as
user shells, but won't read locale settings from anywhere but
environment.
[zj: cherry-pick just the second patch from the series, see discussion
on the pull request.]
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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...
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This way we can make use of our logic to automatically determine an
appropriate TERM for a specific tty.
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This is useful to fake session ends for processes like shells.
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Since rc-local is now enabled via the SysV compatibility we should only refer
to it based on that too.
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Type=idle is much like Type=simple, however between the fork() and the
exec() in the child we wait until PID 1 informs us that no jobs are
left.
This is mostly a cosmetic fix to make gettys appear only after all boot
output is finished and complete.
Note that this does not impact the normal job logic as we do not delay
the completion of any jobs. We just delay the invocation of the actual
binary, and only for services that otherwise would be of Type=simple.
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