Hi Wouter,
sorry for the late response, I had to re-activate my test setup.
On Tue, May 15, 2012 at 10:40:29PM +0200, Wouter Verhelst wrote:
> Anyway:
>
> On Thu, Jan 19, 2012 at 06:35:36PM +0100, Andreas B. Mundt wrote:
> > I am trying to make swap space available to diskless clients using nbd
> > on a squeeze network. However, using the third option as described in
> > the debconf template fails:
> >
> > You can export a real block device (for instance "/dev/hda1"); a normal
> > file (such as
> > "/export/nbd/bl1"); or a bunch of files all at once. For the third
> > option, you can use
> > "%s" in the filename, which will be expanded to the IP-address of the
> > connecting
> > client. An example would be "/export/swaps/swp%s".
> >
> > I tried "/opt/swp%s" with and without '"', and prepared the file
> > /opt/swp10.0.0.201 like:
> >
> > dd if=/dev/zero of=swp10.0.0.201 bs=1024k count=0 seek=64
> > mkswap swp10.0.0.201
> >
> > but the clients complain about not enough swap area to use on
> > /dev/nbd0.
>
> What does the server say in its syslog at this point?
>
Jun 3 11:14:54 mainserver nbd_server[16197]: connect from 10.0.1.12, assigned
file is /tmp/swap%s
Jun 3 11:14:54 mainserver nbd_server[16197]: Can't open authorization file
(null) (Bad address).
Jun 3 11:14:54 mainserver nbd_server[16197]: Authorized client
Jun 3 11:14:54 mainserver nbd_server[30068]: Starting to serve
Jun 3 11:14:54 mainserver nbd_server[30068]: Could not open exported file
/tmp/swap%s: No such file or directory
Jun 3 11:14:54 mainserver nbd_server[30068]: Exiting.
Jun 3 11:16:41 host nbd_client[1920]: Server closed connection
Jun 3 11:16:41 host nbd_client[1920]: Exiting.
Jun 3 11:14:54 mainserver nbd_server[16197]: Child exited with 1
So the assigned file is not "/tmp/swap10.0.1.12" as expected, but
"/tmp/swap%s". "%s" is not replaced by the IP-address connecting. Of
course, "/tmp/swap%s" does not exist.
> > As soon as I prepare a file /opt/swp%s in the same way, swap space is
> > available on the client and anything works fine.
>
> Did you modify the server config file? If so, what did you set the
> "virtstyle" option to?
>
No, no special modifications at all:
root@mainserver:~# cat /etc/nbd-server/config
[generic]
# If you want to run everything as root rather than the nbd user, you
# may either say "root" in the two following lines, or remove them
# altogether. Do not remove the [generic] section, however.
user = nbd
group = nbd
# What follows are export definitions. You may create as much of them
as
# you want, but the section header has to be unique.
[export]
exportname = /tmp/swap%s
port = 9573
> > So it looks as if %s is not replaced by the IP-address of the client.
Hope this helps debugging the issue.
Best regards,
Andi
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