On 10/07/2017 04:08 AM, Zbigniew Jędrzejewski-Szmek wrote:
On Thu, Oct 05, 2017 at 12:23:57PM +0000, Richard Chan wrote:
Any suggestions on how to instrument systemd inside a CentOS 7 container
(running under docker 1.13 Fedora 27 beta) to determine why it doesn't launch
logind journald dbus-daemon and other units?
What is the main reason that systemd-journald would fail to launch?
The container was created under Fedora 26 and configured to just launch sshd:
FROM centos:7
ENV container docker
STOPSIGNAL SIGRTMIN+3
CMD [ "/sbin/init" ]
RUN yum -y install systemd openssh-server procps-ng; systemctl enable sshd
RUN echo 'root:passwordxxxxxxxxxxxxxxxxxxxxxxxxxxxx' | chpasswd
(I amrelying on all the oci hooks to mount cgroups etc with the correct
permissions and labels).
Under Fedora 26, docker exec container ps -ef
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 11:51 ? 00:00:00 /sbin/init
root 17 1 0 11:51 ? 00:00:00
/usr/lib/systemd/systemd-journald
root 25 1 0 11:51 ? 00:00:00 /usr/lib/systemd/systemd-logind
dbus 26 1 0 11:51 ? 00:00:00 /bin/dbus-daemon --system
--address=sys
root 27 1 0 11:51 ? 00:00:00 /usr/sbin/sshd -D
Under Fedora 27 beta:
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 11:51 ? 00:00:00 /sbin/init
We can't seem to startup journald and friends. /var/lib/docker/ is unchanged
from Fedora 26.
When I boot back into Fedora 26 and launch the container all the units after
/sbin/init work.
You probably need to look at the logs produced by systemd. This should
show why systemd cannot launch processes.
I'm afraid there aren't that many docker experts on this list, and
this is a question about docker / systemd compatibility.
Zbyszek
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We have an open bugzilla on this. I think this is a change in the way
cgroups are setup that is causing the issue.
Hopefully we can look at this next week.
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