I have the following Dockerfile
:
# CONSTRAINT: I need to use this Base Image
FROM openjdk:8-jdk-alpine
RUN apk add openrc
# Reference:
# https://wiki.alpinelinux.org/wiki/Setting_up_a_ssh-server
RUN apk add openssh
RUN rc-update add sshd
# This fails, why?, how to fix it?
# RUN /etc/init.d/sshd start
# ...
# what to put here in order to install a SSH server?
# ...
# Just to keep the Container running
ENTRYPOINT ["tail", "-f", "/dev/null"]
To run that container I do:
$ docker build -t myorg/myapp .
$ docker run -d --name myapp-instance myorg/myapp
$ docker exec -ti myapp-instance /bin/sh
My question is: how to install a SSH
server on that container?
I tried what is explained on this link:
https://wiki.alpinelinux.org/wiki/Setting_up_a_ssh-server
but when I do:
# rc-status
I get:
* Caching service dependencies ...
Service `hwdrivers' needs non existent service `dev' [ ok ]
Runlevel: sysinit
sshd [ stopped ]
Dynamic Runlevel: hotplugged
Dynamic Runlevel: needed/wanted
Dynamic Runlevel: manual
and when I do:
# /etc/init.d/sshd start
I get:
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/blkio/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/cpu/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/cpuacct/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/cpuset/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/devices/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/freezer/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/hugetlb/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/memory/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/net_cls/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/net_prio/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/perf_event/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/pids/tasks: Read-only file system
/lib/rc/sh/openrc-run.sh: line 101: can't create /sys/fs/cgroup/systemd/tasks: Read-only file system
* You are attempting to run an openrc service on a
* system which openrc did not boot.
* You may be inside a chroot or you may have used
* another initialization system to boot this system.
* In this situation, you will get unpredictable results!
* If you really want to do this, issue the following command:
* touch /run/openrc/softlevel
* ERROR: sshd failed to start
Any idea on how to make the SSH
server to work on this doker container with the constraints highlighted on the Dockerfile
?
If possible, please, provide the updated Dockerfile
.
Thanks!