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Bug 1201682 - When /dev/console does not exist like in a container, running console-getty.service just causes endless error in the log
Summary: When /dev/console does not exist like in a container, running console-getty.s...
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: systemd-container
Version: 7.1
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Lukáš Nykrýn
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 1302191
TreeView+ depends on / blocked
 
Reported: 2015-03-13 09:15 UTC by Jan Pazdziora
Modified: 2016-01-27 11:01 UTC (History)
4 users (show)

Fixed In Version: systemd-container-208.20-5.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-01-27 11:01:54 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Jan Pazdziora 2015-03-13 09:15:07 UTC 
Description of problem:

Create minimal image which runs systemd(-container) based on rhel7.1, using Dockerfile

   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...

Version-Release number of selected component (if applicable):

package systemd is not installed
systemd-container-208.20-4.el7.x86_64

How reproducible:

Deterministic.

Steps to Reproduce:
1. Build image based on the above Dockerfile.
2. Run container using

docker run -v /sys/fs/cgroup:/sys/fs/cgroup:ro agetty-issue

3. Check processes and journal, using

   docker exec <the-container-id> ps axuwwf
   docker exec <the-container-id> journalctl

Actual results:

/sbin/agetty running and restarted every minut.

Expected results:

/sbin/agetty not running.

Additional info:
Comment 1 Jan Pazdziora 2015-03-13 09:15:45 UTC 
I proposed the following patch:

--- a/console-getty.service	2015-03-13 05:02:40.895716807 -0400
+++ b/console-getty.service	2015-03-13 05:06:54.067478792 -0400
@@ -11,6 +11,7 @@
 After=systemd-user-sessions.service plymouth-quit-wait.service
 After=rc-local.service
 Before=getty.target
+ConditionPathExists=/dev/console
 
 [Service]
 ExecStart=-/sbin/agetty --noclear --keep-baud console 115200,38400,9600 $TERM
Comment 3 Lukáš Nykrýn 2015-03-13 10:43:37 UTC 
Hmm /dev/cosnole is mentioned in our 
http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/
as one of the interfaces that should be present.
Can I ask you to send this patch to our upstream mailing list?
Meanwhile I would be open to apply it in systemd-container since we already have there some downstream workarounds.
Comment 4 Jan Pazdziora 2015-03-13 10:47:33 UTC 
(In reply to Lukáš Nykrýn from comment #3)
> Hmm /dev/cosnole is mentioned in our 
> http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/
> as one of the interfaces that should be present.

However, it is not if you have -t (and rightly so, I'd say):

# docker run rhel7.1 ls -la /dev/console
ls: cannot access /dev/console: No such file or directory
# docker run -t rhel7.1 ls -la /dev/console
crw-------. 1 root root 136, 2 Mar 13 06:46 /dev/console
#

> Can I ask you to send this patch to our upstream mailing list?

I'd prefer you took it from here. I'm not subscribed there.
Comment 5 Lukáš Nykrýn 2015-03-13 11:53:18 UTC 
> I'd prefer you took it from here. I'm not subscribed there.

Ok, will do.
Comment 6 Lukáš Nykrýn 2015-03-17 13:17:10 UTC 
Your patch is now in upstream
http://cgit.freedesktop.org/systemd/systemd/commit/?id=1b41981d9a62443d566df6bcabc1b5024e9f5e4a

devel_ack for backport
Comment 7 Lukáš Nykrýn 2016-01-27 11:01:54 UTC 
This is fixed in 7.2 by introducing the regular systemd-219
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