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List:       systemd-devel
Subject:    [systemd-devel] systemd remounts root fs read-only, doesn't detect lxc-libvirt
From:       flokli () flokli ! de (Florian Klink)
Date:       2013-09-30 13:39:57
Message-ID: 52497F2D.6040904 () flokli ! de
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Am 29.09.2013 22:06, schrieb Florian Klink:
> Am 29.09.2013 21:59, schrieb Lennart Poettering:
>> On Sat, 28.09.13 16:35, Florian Klink (flokli at flokli.de) wrote:
>>
>>> Hi,
>>>
>>> I setup some freshly-bootstrapped Arch Linux containers using systemd
>>> 204 (so only systemd inside, no old init systems)
>>>
>>> They are started using libvirt-lxc.
>>> The root of the container filesystem is a mountpoint (in my case, aufs
>>> filesystem, to save some space and use "base images", but this is also
>>> reproducible with a loop ext filesystem mounted on the root location).
>>>
>>> /dev/loop0 /var/lib/libvirt/filesystems/test/root ext4
>>> rw,relatime,data=ordered 0 0
>>>
>>> According to src/core/umount.c, the "remount,ro" of / should not occur
>>> when systemd is started inside a "container environment".
>>>
>>> However, after starting up, then shutting down the container, the
>>> filesystem is mounted ro.
>>>
>>> /dev/loop0 /var/lib/libvirt/filesystems/test/root ext4
>>> ro,relatime,data=ordered 0 0
>>>
>>> So probably systemd is not detecting here correctly that it's running
>>> inside the container, although "lxc-libvirt" as env for pid 1 seems to
>>> be supported inside detect_container().
>>>
>>> So something is apparently wrong here.
>>> Is there any way to find out why it is remounting ro?
>> Maybe you have listed it as such in the fstab of the container?
>>
>> Does "systemd-detect-virt" in the container detect libvirt-lxc correcty?
>>
>> Lennart
>>
> yes, it says "libvirt-lxc".
> fstab inside the container is empty.
>
> Florian
>
I did the bootstrap of the container fs again, now systemd-207-5 is
installed.

With this, the problem magically disappears, container fs stays mounted rw.

But still thanks for your help!

Florian

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