Re: [Ltsp-discuss] module aufs/overlayfs not found in modules.dep

[Vagrant Cascadian]

On 2017-05-21, Michael Pope  wrote:
> I'm using LTSP under Debian 8 Jessie which I've just upgraded from
> Wheezy. The upgraded went great.

Given that Debian stretch is in the deep stages of freeze... you might
want to consider upgrading to stretch soon, and basically skip jessie
entirely...


> The problem I have is I would like to install kernel 4.9 under the LTSP
> client but I'm getting these errors when I boot a thin client.
>
> : modprobe: module overlayfs not found in modules.dep
> : modprobe: module aufs not found in modules.dep
> : Could not load neither overlayfs nor aufs.

You'll need to use ltsp-client and ltsp-client-core packages from
jessie-backports if you want to use a kernel from jessie-backports, or
switch back to the kernels that are supported in plain jessie.

I think the version of LTSP in jessie only supports "overlayfs" (an
out-of-tree module not present in Debian, but used in Ubuntu for some
releases), not to be confused with "overlay" fs (in mainline linux
4+). The jessie-backports and stretch kernels only support "overlay" fs.

Additionally, "overlay" fs doesn't have the best track record at NFS
compatibility, so the default for LTSP in jessie-backports and stretch
is to use NBD+squashfs.

Hope that's helpful!


> - [X] Try downloading aufs-dkms under the chroot section

I've been meaning to try aufs-dkms to see if it would work with recent
4.x kernels, but haven't gotten around to it yet...


live well,
  vagrant


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[Ltsp-discuss] module aufs/overlayfs not found in modules.dep

[Michael Pope]

I'm using LTSP under Debian 8 Jessie which I've just upgraded from
Wheezy. The upgraded went great.

The problem I have is I would like to install kernel 4.9 under the LTSP
client but I'm getting these errors when I boot a thin client.

: modprobe: module overlayfs not found in modules.dep
: modprobe: module aufs not found in modules.dep
: Could not load neither overlayfs nor aufs.
: modprobe: module ehci-orion not found in modules.dep
:
: BusyBox v1.22.1
:
: /bin/sh: can't access tty: job control turned off.

Installed the following
sudo aptitude -t jessie-backports install linux-image-4.9.0-0.bpo.2-686
linux-headers-4.9.0-0.bpo.2-all

I've tried the following to fix this issue

- [X] Tried installing aufs-tools, ltsp-update-kernels &
ltsp-update-image = fail

- [X] Installed linux-image-4.9.0-0.bpo.2-686-pae within chroot
= fail

- [X] Try downloading aufs-dkms under the chroot section = fail
  : apt install wget
  : wget
http://ftp.cn.debian.org/debian/pool/main/a/aufs/aufs-dkms_4.9+20161219-2_i386.deb
  : dpkg -i aufs-dkms_4.9+20161219-2_i386.deb
  : apt-get -f install
  : exit
  : sudo ltsp-update-kernels
  : sudo ltsp-update-image
   
It looks as if the kernel in jessie-backports may not have aufs or
overlayfs.

How do I get this working?

from
Michael

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Re: [Ltsp-discuss] Only some users can log in?

[Joseph Bishay]

Good day Alkis,

I hope you are doing very well today.

With regards to the situation where users can log into the main server
but cannot log into a thin client, I wanted to follow-up with what you
did.

After you had logged into the server and created the user LTSP using
the command line (instead of Webmin) I went to the school and tested
logging in as the user at a client.  The user could not log in.  The
same issue arises -- the system seems to be loading the desktop, then
it flashes back to the login screen.

I was also able to activate the VT-x in the BIOS and using Virtual
box, the same problem occurred.

I looked in the directory of the LTSP user that you had created and I
can see, after the failed login attempt the following new item:

Directories:
Desktop
Documents
Downloads
Music
Pictures
Public
Templates
Videos

Files:
.cache
.dbus
.Xauthority
.bash_history
.bash_logout
.bashrc
.profile
.xsession-errors

The only one that seemed relevant was .xsession-errors.  The contents
of that file are:

Xsession: X session started for ltsp at Fri May 19 16:50:14 EST 2017
localuser:ltsp being added to access control list
openConnection: connect: No such file or directory
cannot connect to brltty at :0
/etc/X11/Xsession: 3: [: x: unexpected operator
Xsession: X session started for ltsp at Fri May 19 16:58:28 EST 2017
localuser:ltsp being added to access control list
openConnection: connect: No such file or directory
cannot connect to brltty at :0
/etc/X11/Xsession: 3: [: x: unexpected operator

Searching through the logs is throwing up a lot of things because the
username is LTSP!  I can create a new user with a more unique name and
try to search the logs again.  What else could I do?

Thank you!
Joseph


On Fri, May 19, 2017 at 1:36 AM, Alkis Georgopoulos  wrote:
> Hi Joseph,
>
> it sounds like a problem specific to your setup, caused by some
> administrative actions. Its troubleshooting may require some time, so
> it'd be best if you came to IRC some weekday morning (Greek timezone)
> for remote support.
>
> http://ltsp.org/irc
>
> Cheers,
> Alkis Georgopoulos
> Professional LTSP support: alk...@gmail.com
>
>
> On 18/05/2017 11:31 μμ, Joseph Bishay wrote:
>> Hello Alkis,
>>
>> I went to the school and followed your recommendation to test changing
>> the session to xterm fallback and then launching the desktop from
>> there so I can see the errors.  I tried that but the xterm doesn't
>> launch.  Exactly the same error occurs -- it appears to be loading
>> but then the screen blanks out and then reloads the login screen.
>>
>> I also wondered if it was an issue with the users and how they were
>> rsynced.  So I used Webmin to delete the users and all their files,
>> their group, home folders and files.  I then imported into webmin a
>> clean list of users with the correct UID and hashed passwords.  The
>> system correctly created their home directories with the right UID
>> permissions.  I didn't move into it any of their old files.  At the
>> server console I can log into the graphical interface as the user no
>> problem, but at a fat client I cannot - same issue that it appears to
>> load, then refreshes and brings up the login screen.
>>
>> What do you think?
>>
>> Thank you
>> Joseph
>
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