I installed docker image and built a image successfully.
When I ssh to the container and run the command service xxx start
, an error popped:
service nginfra start
Redirecting to /bin/systemctl start nginfra.service /sbin/service: line 79: /bin/systemctl: No such file or directory
Actually, fakesystemd
is installed in the container instead of systemd
.
So I removed fakesystemd
and installed systemd
with the command:
yum swap -- remove fakesystemd -- install systemd systemd-libs
But I still can't start the service:
service nginfra start
Redirecting to /bin/systemctl start nginfra.service Failed to get D-Bus connection: No connection to service manager.
Does anyone ever meet and solved this issue?
I've managed to fix this issue in a CentOS:7 Docker container. I've followed mainly the Guide on CentOS Docker image project.
FROM centos:7
ENV container docker
RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == \
systemd-tmpfiles-setup.service ] || rm -f $i; done); \
rm -f /lib/systemd/system/multi-user.target.wants/*;\
rm -f /etc/systemd/system/*.wants/*;\
rm -f /lib/systemd/system/local-fs.target.wants/*; \
rm -f /lib/systemd/system/sockets.target.wants/*udev*; \
rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
rm -f /lib/systemd/system/basic.target.wants/*;\
rm -f /lib/systemd/system/anaconda.target.wants/*;
# Install anything. The service you want to start must be a SystemD service.
CMD ["/usr/sbin/init"]
Now, build the image, and run it using at least the following arguments to docker run
command: -v /run -v /sys/fs/cgroup:/sys/fs/cgroup:ro
Then main point is that /usr/sbin/init
must be the first process inside the Docker container.
So if you want to use a custom script that executes some commands before running /usr/sbin/init
, launch it at the end of your script using exec /usr/sbin/init
(in a bash script).
Here is an example:
ADD cmd.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/cmd.sh
CMD ["/usr/local/bin/cmd.sh"]
And here is the content of cmd.sh
:
#!/bin/bash
# Do some stuffs
exec /usr/sbin/init # To correctly start D-Bus thanks to https://forums.docker.com/t/any-simple-and-safe-way-to-start-services-on-centos7-systemd/5695/8
You could have System is booting up. See pam_nologin(8)
if your using the PAM system, in that case, delete /usr/lib/tmpfiles.d/systemd-nologin.conf
in your Dockerfile
because it creates the file /var/run/nologin
which generates this specific error.
This is known issue with systemd
-based OSes inside Docker containers.
Short answer: as well as replacing fakesystemd
with systemd
you need to attach /sys/fs/cgroup
as a read-only volume into the container, build the image and then run it in "privileged" mode.
This is the best guide I've found for this. It uses Centos as the example, but should work with any systemd
-based OS.
来源:https://stackoverflow.com/questions/28495341/start-a-service-in-docker-container-failed-with-error-failed-to-get-d-bus-conne