Bug 445072 - NBD swap on ltsp client not working
NBD swap on ltsp client not working
Product: Fedora
Classification: Fedora
Component: ltsp (Show other bugs)
i386 Linux
low Severity low
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Assigned To: Warren Togami
Fedora Extras Quality Assurance
Depends On:
Blocks: K12LTSP
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Reported: 2008-05-03 03:52 EDT by Frantisek Hanzlik
Modified: 2008-08-04 15:17 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2008-08-04 15:17:28 EDT
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Description Frantisek Hanzlik 2008-05-03 03:52:46 EDT
Description of problem:
/etc/xinetd.d/nbdswapd on server specify port 9572, but on client side
usr/share/ltsp/ltsp-init-common specify default port 9210. Thus, without
is port 9572 explicitly defined in lts.conf, NBD swap isn't working.

I must add some small delay (sleep 0.5) to /usr/share/ltsp/ltsp-init-common
routine configure_swap after "modprobe nbd", else next command nbd-client
for some reason fail:

        modprobe nbd
        sleep 0.5
        nbd-client $SWAP_SERVER $NBD_PORT /dev/nbd0 && ....

Tested on 800MHz PIII/256MB thin client, on slower HW it maybe run OK...

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Comment 1 Warren Togami 2008-05-04 21:20:47 EDT
Thanks for the report.  We will look into this.

You might be interested to follow our development mailing list and weekly
development meetings.
Comment 2 Warren Togami 2008-05-05 17:56:02 EDT
Here's an interesting problem:

[root@newcaprica cups]# telnet 9572
Connected to
Escape character is '^]'.
/usr/sbin/nbdswapd: line 23: /dev/stderr: No such device or address
Connection closed by foreign host.

Do you see this as well?
Comment 3 Frantisek Hanzlik 2008-05-05 18:11:34 EDT
oh, sorry, it I resolved by changes (/usr/sbin/nbdswap):

 if [ -n "$SWAPDIR" ]; then
     if [ -d "$SWAPDIR" ] && [ -w "$SWAPDIR" ]; then

and path to nbd-server is on Fedora diferent:

 # start the swap server
-/bin/nbd-server 0 $SWAP $NBD_SERVER_OPTS -C /dev/null > /dev/null 2>&1
+/usr/bin/nbd-server 0 $SWAP $NBD_SERVER_OPTS -C /dev/null > /dev/null 2>&1
 # clean up the swap file
Comment 4 Frantisek Hanzlik 2008-05-05 18:26:22 EDT
And if I remember, directory "/var/lib/ltsp/swapfiles" (defined by SWAPDIR
in /etc/ltsp/nbdswapd.conf) was owned by root:root, mode 755 (I'm not sure).
But xinet daemod start /usr/sbin/nbdswapd as user "nobody", thus

chown nobody:root /var/lib/ltsp/swapfiles
chmod 770 /var/lib/ltsp/swapfiles

Comment 5 Bug Zapper 2008-05-14 06:35:07 EDT
Changing version to '9' as part of upcoming Fedora 9 GA.
More information and reason for this action is here:
Comment 6 Warren Togami 2008-05-16 13:02:27 EDT
Please look over the changes I made upstream with are slightly different from
your changes.  This works for me.  Will be in the next version pushed to updates.
Comment 7 Warren Togami 2008-08-04 15:17:28 EDT
This was fixed in Fedora 9 updates a while ago.  You get 64MB NBD swap by default now.  Edit /etc/ltsp/nbdswapd.conf to change the amount.

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