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Bug#595920: marked as done (lxc-attach does not work)

Your message dated Fri, 28 Oct 2011 04:58:48 +0100
with message-id <1319774328.6759.39.camel@deadeye>
and subject line Re: lxc-attach does not work
has caused the Debian Bug report #595920,
regarding lxc-attach does not work
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
595920: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=595920
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: lxc
Version: 0.7.2-1
Severity: important
Tags: patch

lxc-attach does not work as expected.
To demonstrate, let's try to attach to a running container
which has booted a debootstrap'ped system on its own rootfs:

icarus:~# lxc-attach -n bender
lxc-attach: No such file or directory - failed to open '/proc/4581/ns/pid'
lxc-attach: failed to enter the namespace

The relevant part of the `ps axf` output displaying the container's
processes is below:

 4563 ?        Ss     0:00 lxc-start -n bender -f /etc/lxc/bender.conf -d
 4581 ?        Ss     0:00  \_ init [2]
 4941 ?        Sl     0:00      \_ /usr/sbin/rsyslogd -c4
 5012 ?        Ss     0:00      \_ /usr/sbin/cron
 5022 ?        Ss     0:00      \_ /usr/sbin/sshd
10157 ?        Ss     0:00      \_ /usr/sbin/apache2 -k start
10674 ?        S      0:00      |   \_ /usr/sbin/apache2 -k start
10675 ?        S      0:00      |   \_ /usr/sbin/apache2 -k start
10676 ?        S      0:00      |   \_ /usr/sbin/apache2 -k start
10677 ?        S      0:00      |   \_ /usr/sbin/apache2 -k start
10678 ?        S      0:00      |   \_ /usr/sbin/apache2 -k start
14527 ?        S      0:00      \_ /bin/sh /usr/bin/mysqld_safe
14638 ?        Sl     0:00      |   \_ /usr/sbin/mysqld --basedir=/usr --datadir
14639 ?        S      0:00      |   \_ logger -t mysqld -p daemon.error
15771 pts/0    Ss+    0:00      \_ /sbin/getty 38400 tty1


It was suggested to me on the #lxcontainers channel that the kernel
requires the support for a new syscall, sys_setns, for lxc-attach to work.
The patch is available from LXC upstream at
http://lxc.sourceforge.net/patches/linux/2.6.35/2.6.35-lxc1/patches/

Please consider discussing inclusion of this patch with the kernel folks
as the properly functioning lxc-attach is crucial to implement graceful
shutdown of the containers using "full" rootfs like those created using
debootstrap. (I'm going to file a separate bug report regarding this aspect
of functionality.)

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 2.6.32-5-686 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages lxc depends on:
ii  libc6                         2.11.2-2   Embedded GNU C Library: Shared lib
ii  libcap2                       1:2.19-3   support for getting/setting POSIX.

Versions of packages lxc recommends:
ii  libcap2-bin                   1:2.19-3   basic utility programs for using c

lxc suggests no packages.

-- Configuration Files:
/etc/default/lxc changed:
RUN=yes
CONF_DIR=/etc/lxc
CONTAINERS="bender"


-- no debconf information

--- End Message ---
--- Begin Message --- 
Version: 3.0.0~rc1-1~experimental.1

On Tue, 2010-09-07 at 13:52 +0400, Konstantin Khomoutov wrote:
[...]
> It was suggested to me on the #lxcontainers channel that the kernel
> requires the support for a new syscall, sys_setns, for lxc-attach to work.
> The patch is available from LXC upstream at
> http://lxc.sourceforge.net/patches/linux/2.6.35/2.6.35-lxc1/patches/
> 
> Please consider discussing inclusion of this patch with the kernel folks
> as the properly functioning lxc-attach is crucial to implement graceful
> shutdown of the containers using "full" rootfs like those created using
> debootstrap. (I'm going to file a separate bug report regarding this aspect
> of functionality.)
[...]

The setns() system call was finally added in 3.0.

Ben.

-- 
Ben Hutchings
All the simple programs have been written, and all the good names taken.

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