Edubuntu 12.04 LTSP - Fat clients hangs on shutdown with Kernel 3.8 and higher

[Alkis Georgopoulos]

Στις 20/05/2014 02:18 πμ, ο/η Nick Fenger έγραψε:
> Alkis,
>
> I've done some more testing and the newest nbd-disconnect IS working on
> my previously non-working Dell Optiplex 7xx series. As you stated,
> shutdown works when initiated from the graphical interfaces - LightDM
> (fat) and LDM (thin). I'll test my Gateway E Series systems when I'm at
> my other school tomorrow.
>
> Initiating the shutdown command via a terminal session or ssh still
> fails (nbd-disconnect is not called). Is there a way to cleanly shutdown
> the client via ssh? - Or - clean up the server connections, swap files,
> etc... after a more aggressive shutdown (since the ssh shutdown will be
> initiated from the server anyway).



First, try plain `poweroff` from root at tty1. It should "just work".
Then go on with trying `poweroff` from root at ssh_connection. That should 
work, even if you do it from an ssh connection.

Don't use `shutdown` as in some versions it means "halt but don't 
poweroff the system".

If you're still having problems, ensure that you have reverted all of 
your local changes to `poweroff` (script wrapper etc).

BTW, because some people still suggest `poweroff -fp`, let me mention that:
  * it leaves the ssh connections open
  * it leaves the nbd connections open
  * the swap files on the server don't get deleted
  * in 3.13+ kernels, the nbd-server process for that client hangs,
    and that client then can't boot again for some time.

That's why nbd-disconnect was implemented, to bypass problems caused by 
`poweroff -fp`. It was just not triggered in 12.04 because we changed 
the LTSP /proc/cmdline without updating nbd-disconnect.