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

June 26th, 2012 - 06:00 pm ET by Andreas Brogle | Report spam
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

chroot information: /opt/ltsp/i386

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

ltsp-server/build_client: false



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#1 Vagrant Cascadian
June 27th, 2012 - 08:50 pm ET | Report spam
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



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#2 Andreas Brogle
June 28th, 2012 - 07:10 am ET | Report spam
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



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