Debian Bug report logs - #679187
ltsp-server: Login from diskless client fails "server not responding. restart ...")

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Andreas Brogle <brogle@wel.de>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: ltsp-server: Login from diskless client fails "server not responding. restart ...")

Date: Tue, 26 Jun 2012 23:35:16 +0200

Package: ltsp-server
Version: 5.4.1-1
Severity: important

Dear Maintainer,

since a month ago, ltsp had been working for me fine for several years.

With an update of Debian Sid I get this problem first time, if any of the users on the clients tries to login with ldm.
"Keine Antwort des Server. Neustart ..." (translates to "server not responding. restart ...")

Although this bug seems to exist since years, I couldn't find a solution for me, despite of extensively researching the internet. Nobody seems to understand the problem.

I found out a way to avoid the above, but it's not practically :
Make a root account in the chroot environment.
Do a login as root on a client console.
<CTRL> + <ALT> + F1
Make a ssh connection to the server.
[client$] ssh server
Switch back to ldm.
<ALT> + F7
Login as user with ldm works now as it should as long, as the client machine is not rebooted.

I hope this helps one of the developers to solve that bug. There seems to be something wrong with ssh.

Thanks,
Andreas

-- Package-specific info:
chroot information: /opt/ltsp/i386

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.4-4.slh.1-aptosid-amd64 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages ltsp-server depends on:
ii  debconf [debconf-2.0]  1.5.44
ii  debconf-utils          1.5.44
ii  debootstrap            1.0.41
ii  gettext-base           0.18.1.1-9
ii  iproute                20120521-3
ii  lsb-release            4.1+Debian7
ii  openssh-client         1:6.0p1-2
ii  python                 2.7.3~rc2-1
ii  tcpd                   7.6.q-23
ii  update-inetd           4.43

Versions of packages ltsp-server recommends:
ii  dnsmasq                           2.62-3
ii  nbd-server                        1:3.1.1-1
ii  nfs-kernel-server                 1:1.2.6-2
ii  openbsd-inetd [inet-superserver]  0.20091229-2
ii  openssh-server                    1:6.0p1-2
ii  squashfs-tools                    1:4.2-4+b1
ii  tftpd-hpa                         5.2-2

Versions of packages ltsp-server suggests:
pn  audiooss                           <none>
ii  dnsmasq                            2.62-3
ii  fluxbox [x-window-manager]         1.3.2-4
ii  isc-dhcp-server [dhcp3-server]     4.2.2.dfsg.1-5
ii  ldm-server                         2:2.2.10-1
ii  libasound2-plugins                 1.0.25-2
ii  ltsp-docs                          1.1-1
ii  ltspfs                             1.1-2
ii  metacity [x-window-manager]        1:2.34.3-2
ii  pulseaudio                         2.0-3
pn  qemu-user-static                   <none>
pn  sdm                                <none>
ii  x11-utils                          7.7~1
ii  xauth                              1:1.0.7-1
ii  xfce4-session [x-session-manager]  4.8.3-2
ii  xfwm4 [x-window-manager]           4.8.3-1

-- debconf information:
  ltsp-server/build_client: false

Message #10 received at 679187@bugs.debian.org (full text, mbox, reply):

From: Vagrant Cascadian <vagrant@freegeek.org>

To: Andreas Brogle <brogle@wel.de>, 679187@bugs.debian.org

Subject: Re: Bug#679187: ltsp-server: Login from diskless client fails "server not responding. restart ...")

Date: Wed, 27 Jun 2012 17:41:39 -0700

On Tue, Jun 26, 2012 at 11:35:16PM +0200, Andreas Brogle wrote:
> since a month ago, ltsp had been working for me fine for several years.
>
> With an update of Debian Sid I get this problem first time, if any of the 
> users on the clients tries to login with ldm.
> "Keine Antwort des Server. Neustart ..." (translates to "server not 
> responding. restart ...")

The recent versions of LTSP (ltsp-update-sshkeys) and LDM do not verify IP 
addresses when making the ssh connection.

Sounds like you also need to update your LTSP chroot to use the newer verison 
of LDM (2.2.10-1), or if that's not possible, configure 
/etc/ltsp/ssh_known_hosts.* to include an entry for each of the IP addresses of 
your servers.

live well,
  vagrant

Message #15 received at 679187@bugs.debian.org (full text, mbox, reply):

From: Andreas Brogle <brogle@wel.de>

To: 679187@bugs.debian.org

Subject: Re: Bug#679187: ltsp-server: Login from diskless client fails "server not responding. restart ...")

Date: Thu, 28 Jun 2012 12:35:04 +0200

Am Donnerstag, 28. Juni 2012 schrieb Vagrant Cascadian:
> On Tue, Jun 26, 2012 at 11:35:16PM +0200, Andreas Brogle wrote:
> > since a month ago, ltsp had been working for me fine for several years.
> > 
> > With an update of Debian Sid I get this problem first time, if any of the
> > users on the clients tries to login with ldm.
> > "Keine Antwort des Server. Neustart ..." (translates to "server not
> > responding. restart ...")
> 
> The recent versions of LTSP (ltsp-update-sshkeys) and LDM do not verify IP
> addresses when making the ssh connection.
> 
> Sounds like you also need to update your LTSP chroot to use the newer
> verison of LDM (2.2.10-1), or if that's not possible, configure
> /etc/ltsp/ssh_known_hosts.* to include an entry for each of the IP
> addresses of your servers.

As you suggested I did a 
"ltsp-build-client --arch i386 --dist sid --mirror http://192.168.0.10/apt 
cacher/cdn.debian.net/debian"
Now it works again :-)

The goal originally had been to minimize maintenance and hardware resources of 
the thin clients. Thought it would be a good idea to use Debian Stable for the 
chroot environment. So I only had to maintain the server. Seems that was an 
aberration.

Bug can be closed.

Thanks,
Andreas

Message #25 received at 679187-done@bugs.debian.org (full text, mbox, reply):

From: Vagrant Cascadian <vagrant@freegeek.org>

To: 679187-done@bugs.debian.org

Subject: Re: Bug#679187: ltsp-server: Login from diskless client fails "server not responding. restart ...")

Date: Thu, 28 Jun 2012 07:35:08 -0700

On Thu, Jun 28, 2012 at 12:35:04PM +0200, Andreas Brogle wrote:
> Am Donnerstag, 28. Juni 2012 schrieb Vagrant Cascadian:
> > The recent versions of LTSP (ltsp-update-sshkeys) and LDM do not verify IP
> > addresses when making the ssh connection.
> > 
> > Sounds like you also need to update your LTSP chroot to use the newer
> > verison of LDM (2.2.10-1), or if that's not possible, configure
> > /etc/ltsp/ssh_known_hosts.* to include an entry for each of the IP
> > addresses of your servers.
> 
> As you suggested I did a 
> "ltsp-build-client --arch i386 --dist sid --mirror http://192.168.0.10/apt 
> cacher/cdn.debian.net/debian"
> Now it works again :-)
> 
> The goal originally had been to minimize maintenance and hardware resources of 
> the thin clients. Thought it would be a good idea to use Debian Stable for the 
> chroot environment. So I only had to maintain the server. Seems that was an 
> aberration.

It's possible, but requires a little more manual configuration for the server's
ssh keys; another option I keep forgetting about is to specify 
LDM_SERVER=server and LDM_SSHOPTIONS="-o CheckHostIP=no" in lts.conf, which
doesn't require configuring the ssh keys.

wheezy will freeze soon (June 30th), so that should be a little bit more stable
than sid in the near future.

 
> Bug can be closed.

Ok, sending to -done.

thanks!

live well,
  vagrant

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