IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 7 June 2010 (all times are UTC)
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| 02:06 | <gnunux> hi
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| 03:22 | <alkisg_web> !buttons_layout
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| 03:22 | <ltspbot> alkisg_web: Error: "buttons_layout" is not a valid command.
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| 03:23 | <alkisg_web> !button_layout
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| 03:23 | <ltspbot> alkisg_web: "button_layout" :: To revert the Ubuntu button position and ordering to their old values, run: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /apps/metacity/general/button_layout menu:minimize,maximize,close
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| 05:38 | <tomee^> hi, I am using LTSP for nodes of a small cluster. recently, after a power failure I cannot boot with ubuntu -server kernels, only -generic works. Any idea why?
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| 05:58 | <peter_tm> No idea, but can we hypothesize that there might have been some type of corruption.. Can you run a MDM5 check on the kernel, or do you have a backup of the hard drive available?
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| 05:59 | <tomee^> Sure, w8
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| 06:00 | so, vmlinuz-2.6.24-24-server in /var/lib/tftpboot is the same as in /boot
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| 06:00 | bot initrds are different
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| 06:00 | are they supposed to be different ie does LTSP add something to the initrd?
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| 06:01 | s/bot/but/g
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| 06:05 | <alkisg> tomee^: compare them to /opt/ltsp/i386/boot/vmlinuz, not with /boot
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| 06:06 | You cannot boot the server or the clients with that kernel?
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| 06:06 | <tomee^> the clients
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| 06:06 | the server booted fine
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| 06:06 | but clients can only boot with 2.6.24-16-generic so far
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| 06:06 | awww
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| 06:07 | it's the only one in /opt/ltsp/i386/boot ...
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| 06:07 | <alkisg> Why would you want to use the server kernel for the clients?
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| 06:07 | <tomee^> alkisg: because they have 10G ram
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| 06:07 | <alkisg> The clients?! Wow...
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| 06:07 | 32bit with PAE extensions kernel? Which distro/version is that?
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| 06:08 | <tomee^> ubuntu hardy
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| 06:08 | it's a small hpc cluster with diskless nodes
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| 06:08 | <alkisg> OK - when you upgrade to lucid, the -generic-pae kernel will be automatically selected.
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| 06:09 | To install the -server kernel now, just chroot and install it
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| 06:11 | <tomee^> ok, and then copy it to /var/lib/tftpboot ?
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| 06:12 | <ogra_cmpc> ltsp-update-kernels
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| 06:12 | <tomee^> ic
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| 06:12 | <alkisg> ...and ltsp-update-image
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| 06:12 | <tomee^> ok
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| 06:12 | <ogra_cmpc> right
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| 06:12 | <tomee^> root@c1:/# aptitude install linux-image-2.6.24-28-server
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| 06:13 | The following NEW packages will be installed:
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| 06:13 | lilo linux-image-2.6.24-28-server mbr
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| 06:13 | won't it screw up mbr in the master server? ;]
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| 06:13 | <alkisg> No - not if you don't mount /dev
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| 06:14 | Just mount /proc, nothing else.
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| 06:14 | (and maybe it even works without /proc)
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| 06:14 | I think you can also do --no-install-recommends or something...
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| 06:14 | <tomee^> I think these are dependencies not recommendations
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| 06:15 | but you're right, not mounting /dev makes sens
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| 06:16 | (rebooting nodes)
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| 06:20 | same problem
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| 06:20 | mount: mounting /dev/nbd0 on /rofs failed: No such device
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| 06:21 | if it didn't work at all I would suspect a broken configuration of the master
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| 06:21 | but why the heck does it work with the generic kernel?
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| 06:22 | <alkisg> Remove "quiet splash" from /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default
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| 06:22 | Reboot the clients, maybe you'll see a different error message then (e.g. the network module missing or something)
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| 06:25 | <tomee^> I already removed it
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| 06:26 | I can see it connecting to the NBD server
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| 06:27 | rootserver: 192.168.37.20 rootpath:
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| 06:27 | filename: /ltsp/i386/pxelinux.0
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| 06:27 | Negotiation: ..size = 255637KB
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| 06:27 | bs=1024, sz=255736
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| 06:27 | and then: mount: mounting /dev/nbd0 on /rofs failed: No such device
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| 06:28 | <alkisg> Urm... that doesn't sound right
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| 06:28 | Try putting break=mount in pxelinux.cfg/default, to manually test stuff
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| 06:28 | (or do you get a busybox?)
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| 06:28 | <tomee^> I get a busybox
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| 06:29 | <alkisg> ls -l /dev/nbd0
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| 06:29 | ls rofs, etc... are those there?
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| 06:30 | <tomee^> brw-rw---- 1 0 0 43, 0 /dev/nbd0
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| 06:30 | rofs is there and empty
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| 06:30 | etc contains usplash.conf, console-setup, udev, modprobe.d and default
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| 06:32 | <alkisg> mount -o ro -t squashfs /dev/nbd0 /rofs
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| 06:33 | What does that give you?
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| 06:33 | <tomee^> ount: mounting /dev/nbd0 on /rofs failed: No such device
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| 06:35 | <alkisg> OK, the problem is that `mount` line in ltsp_nbd, but I've no idea why it says "no such device".
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| 06:36 | ogra_cmpc, any ideas?
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| 06:36 | <ogra> lsmod ?
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| 06:36 | <tomee^> nbd module is there
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| 06:37 | <ogra> squashfs ?
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| 06:37 | cat /proc/filesystems
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| 06:37 | though the error should be different then
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| 06:38 | <tomee^> what should I look for in /proc/filesystems?
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| 06:38 | <ogra> squashfs
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| 06:38 | <tomee^> missing
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| 06:38 | <ogra> aha
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| 06:38 | might be that the server kernel misses support for squashfs then
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| 06:38 | check /boot/config-* in your chroot
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| 06:38 | grep for SQUASH
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| 06:40 | <tomee^> nothing, but the 2.6.24-16-generic also doesn't have it
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| 06:40 | while it boots, and squashfs is present in /proc/filesystems
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| 06:41 | <ogra> the config should have CONFIG_SQUASHFS=m
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| 06:41 | and thats a default in the generic kernels
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| 06:41 | since ubuntu exists
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| 06:42 | <tomee^> root@c1:/opt/ltsp/i386/boot# grep SQUASH config-2.6.24-16-generic
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| 06:42 | hmmmm
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| 06:42 | <alkisg> So if you do "modprobe squashfs" and retry that mount line, it works?
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| 06:43 | <tomee^> no
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| 06:43 | it says that module squashfs is not found
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| 06:44 | but I found that 2.6.24-19-server has that module
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| 06:44 | I'll try to boot with it
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| 06:52 | wow, it worked!
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| 06:52 | so I guess I have to stick with this kernel or upgrade to lucid and use -generic-pae
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| 06:53 | anyway, thanks much guys, you were really helpful!
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| 07:25 | <alkisg> tomee^: you can declare the module in an initramfs hook...
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| 07:28 | urm, or put CONFIG_SQUASHFS=m in boot/config...
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| 07:30 | <tomee^> but since the module is not present in /lib/modules
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| 07:30 | I suppose it isn't built at all for this kernel
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| 07:30 | it's funny that Ubuntu drops modules out of a production kernel within one distro release, though
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| 09:01 | <rwmarch> I have " SCREEN_02 = shell " in /var/lib/tftpboot/ltsp/i386/lts.conf.
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| 09:01 | But, no login prompt, only flashing cursor at F2.
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| 09:01 | There is a login prompt at F1, however, users will not authenticate there.
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| 09:01 | Any suggestions, please.
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| 09:02 | <alkisg> The clients determine the location of lts.conf based on the dhcp server's boot filename option
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| 09:03 | What's your dhcpd.conf like?
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| 09:03 | <rwmarch> OK. I will check that.
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| 09:03 | <alkisg> Also, do you have [Default] on top of lts.conf?
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| 09:03 | <rwmarch> Yes.
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| 09:05 | <alkisg> if you have the same arch on the chroot as on the server, you can also try: /opt/ltsp/i386/usr/bin/getltscfg -c /var/lib/tftpboot/ltsp/i386/lts.conf -a
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| 09:09 | <rwmarch> /usr/drs$ /opt/ltsp/i386/usr/bin/getltscfg -c /var/lib/tftpboot/ltsp/i386/lts.conf -a says: http://pastebin.com/ZugTa6rw
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| 09:10 | <alkisg> It seems ok, check your dhcpd.conf.
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| 09:11 | Btw, here's another way to get a shell on the clients: https://help.ubuntu.com/community/UbuntuLTSP/UnlockChrootRootAcct
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| 09:11 | And yet another way:
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| 09:11 | !localxterm
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| 09:11 | <ltspbot> alkisg: "localxterm" :: while sitting on a thin client, open a gnome terminal. In that, run: ltsp-localapps xterm. An xterm will open. That xterm runs locally, so any commands you enter there are executed directly on the client.
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| 09:14 | <rwmarch> localxterm - thanks, good to know. BTW, how do I tell which dhcpd.conf is used, /etc/dhcp3/dhcpd.conf or /etc/ltsp/dhcpd.conf. (Still getting to know version 5.)
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| 09:14 | <alkisg> distro/version?
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| 09:15 | <rwmarch> lucid
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| 09:15 | <alkisg> /etc/ltsp/dhcpd.conf
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| 09:15 | <rwmarch> Thanks.
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| 09:15 | <alkisg> You can put it to pastebin if you want a second look
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| 09:18 | <rwmarch> http://pastebin.com/G2mE6E1z for dhcpd.conf
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| 09:20 | <alkisg> rwmarch: that filename should be relative
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| 09:20 | That's your problem
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| 09:20 | Btw, where's your tftp dir? In /var/lib/tftpboot or in /srv/tftp?
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| 09:21 | (lucid final uses /var/lib/tftpboot, but sometimes it breaks on upgrades from 9.10 and uses /srv/tftp...)
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| 09:22 | <rwmarch> OK. This is fresh install from altn CD.
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| 09:24 | <rwmarch> Clarify for me, which filename in dhcpd.conf you are referring to that should be relative path?
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| 09:24 | <alkisg> grep DIRECTORY /etc/default/tftpd-hpa
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| 09:25 | <rwmarch> TFTP_DIRECTORY="/srv/tftp"
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| 09:26 | <alkisg> OK, you may do the following:
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| 09:26 | 1) file a bug report on laundhpad
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| 09:27 | 2) change that file to the "usual" one:
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| 09:27 | http://pastebin.com/LfgeJgTd
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| 09:27 | 3) restart tftp: sudo restart tftpd-hpa
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| 09:28 | 4) change dhcpd.conf: http://pastebin.com/j9w2GqrA
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| 09:28 | 5) restart dhcpd: sudo invoke-rc.d dhcp3-server restart
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| 09:28 | You should be ok after that.
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| 09:28 | <rwmarch> Will do.
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| 09:29 | <alkisg> Ah, and delete /srv completely, and use /var/lib/tftpboot/ltsp/i386 instead.
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| 09:29 | (run sudo ltsp-update-kernels to make sure)
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| 09:55 | <rwmarch> I erred. This system is not a fresh install, but an alternate CD upgrade from 9.10.
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| 09:55 | And I remember several months ago, with the help of maillist archives, modifying dhcpd.conf because the client was not finding the tftp directory.
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| 09:58 | <rwmarch> Now I am getting:
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| 09:58 | bs=1024, sz=542280
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| 09:58 | /scripts/nfs-bottom/ltsp: eval: line 1: syntax error: redirection unexpected
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| 10:02 | <alkisg> Did you do all of the above steps?
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| 10:02 | I.e. you don't have a /srv anymore?
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| 10:12 | <rwmarch> Yes, I re-checked all of the above steps. Removed the reference to /srv. Restarted dhcp. Restarted tftp. Also took out the option for nfs. Don't think I will need it anymore.
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| 10:12 | http://pastebin.com/BNJciAHY
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| 10:16 | <alkisg> OK, so what do you have in `ls -l /var/lib/tftpboot/ltsp/i386` now?
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| 10:19 | <rwmarch> ls -l /var/lib/tftpboot/ltsp/i386
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| 10:19 | http://pastebin.com/ZVx05Bee
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| 10:25 | <alkisg> Hmm your kernels are old, before the lucid release
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| 10:25 | Try running sudo ltsp-update-kernels
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| 10:25 | <rwmarch> Will do.
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| 10:26 | And just found the syntax problem - lts.conf was causing it.
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| 10:26 | sudo ltsp-update-kernels
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| 10:28 | <rwmarch> So now the client is booting OK. And I am getting the screens. You fixed it. Thanks very much, alkisg.
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| 10:29 | <alkisg> You're welcome.
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| 10:31 | <rwmarch> I have been using LTSP-4 for many years. Have it figured out well enough to get myself through issues. I find version 5 a tough one to get my head around some of what is going on behind the scenes.
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| 10:32 | Would still be floundering without you. A little thin on documentation I find. Could be wrong.
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| 10:33 | <BenG> I found the learning curve much shallower that 4.2 rwmarch , FWIW
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| 10:33 | a few weeks of fiddling and I know where all the scripts are now
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| 10:34 | <rwmarch> In time I may come to the same conclusion, BenG.
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| 10:35 | <BenG> I reckon
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| 11:03 | <LedHed> Do the 'SOUND' and 'X_BLANKING' work with Fat Clients? for some reason I cant get either to work.
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| 11:04 | <johnny> trying to turn sound off?
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| 11:04 | sound is on by default
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| 11:13 | <alkisg> SOUND=off stops pulse from being redirected from the server to the clients - fat clients don't get redirected sound, so I'm not sure what would SOUND=off mean for fat clients.
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| 11:17 | <johnny> alkisg, pretend the sound card is disabled?
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| 11:17 | that's probably what it should do
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| 11:18 | <alkisg> How? That would mean no local sound, it's not the same as SOUND=false for thin clients where local sound still works...
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| 11:18 | <johnny> or set pulse to a null sink
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| 11:18 | i think SOUND=No .. means NO SOUND:)
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| 11:18 | who uses SOUND=No expecting local sound to work?
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| 11:18 | i bet almost nobody
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| 11:19 | pulse to a null sink is probably the easiest
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| 11:19 | <alkisg> Got any idea about the specifics on how to do it?
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| 11:19 | <johnny> pulse to a null sink is just a modification of the default.pa
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| 11:19 | or client.pa.. one of those files
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| 11:20 | but.. one of the reasons people use SOUND=No is to save memory on a low ram thin client
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| 11:20 | <alkisg> And won't sound work with alsa?
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| 11:20 | <johnny> so that won't help that ccase
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| 11:20 | <alkisg> (i.e. if someone sinks pulse, can't the user just select alsa?)
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| 11:20 | <johnny> alkisg, that's why i think it might be best to go a little lower level, perhaps alsa has a way to disabe sound cards.. and if not.. it could just forceall the mixer volumes to 0
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| 11:21 | <alkisg> I tried amixer to set the volume to 0, and it worked, but the users are still able to increase the volume
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| 11:21 | I didn't find any way yet to turn the sound off properly
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| 11:21 | <johnny> alkisg, did you talk to alsa developers?
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| 11:22 | <alkisg> Nope, I didn't go that far
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| 11:22 | <johnny> i think alot of problems with ltsp are folks not talking to upstream!
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| 11:22 | of course.. in the openssh case.. we know they won't do certain things.. like allow the null cipher :(
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| 11:22 | <alkisg> It's also lack of time - only 24h per day :D
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| 11:22 | <johnny> which is sad
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| 11:22 | because the null cipher would stop us from using LDM_DIRECTX as it is
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| 11:22 | <alkisg> E.g. getting teacher screen broadcasting was much more important than muting sound :)
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| 11:23 | Yeah, it also helps a lot on file transfers
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| 11:23 | <johnny> also it's great for transfering lots of data
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| 11:23 | hehe alkisg :)
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| 11:23 | <alkisg> I think there was a new libssh implementation that allowed the null cipher
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| 12:49 | <LedHed> alkisg, do I need to have CONFIGURE_X = True for X_BLANKING to work?
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| 12:50 | <vagrantc> any of the values that require CONFIGURE_X should set it.
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| 12:50 | essentially, CONFIGURE_X shouldn't be needed from lts.conf anymore
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| 12:51 | <LedHed> I have X_BLANKING = 1800 (30 min), but the screen blanks in just 5 minutes.
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| 12:51 | maybe that setting doesnt work with fat clients either
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| 12:53 | <johnny> i just handle it by setting teh gconf keys
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| 12:53 | to enable the screen saver
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| 12:53 | and have those settings enable blanking
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| 12:53 | <LedHed> I'll try that
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| 12:53 | thanks
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| 13:02 | <alkisg> LedHed: fat clients can be better configured using the usual DE ways, e.g. the following file disables screen locking by default:
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| 13:02 | cat /mnt/usr/share/gconf/defaults/10_ltsp_fat_client
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| 13:02 | /desktop/gnome/lockdown/disable_lock_screen true
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| 13:02 | * alkisg wants to make a big collection of useful (in LTSP) gconf keys... | |
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| 13:08 | <LedHed> alkisg, thanks
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| 13:27 | <alkisg> !button_layout
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| 13:27 | <ltspbot> alkisg: "button_layout" :: To revert the Ubuntu button position and ordering to their old values, run: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /apps/metacity/general/button_layout menu:minimize,maximize,close
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| 13:27 | <alkisg> !compiz
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| 13:27 | <ltspbot> alkisg: "compiz" :: if compiz is giving you problems, one way to disable it for all users is: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /desktop/gnome/session/required_components/windowmanager metacity
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| 13:29 | * vagrantc thanks ltspbot for being a great repository of knowledge | |
| 13:35 | <alkisg> !learn disable_lock_screen as To disable screen locking for new users in gnome: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.defaults --type boolean --set /desktop/gnome/lockdown/disable_lock_screen 1. To enable it for a specific user, from that user account run: gconftool-2 --type boolean --set /desktop/gnome/lockdown/disable_lock_screen 0.
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| 13:35 | <ltspbot> alkisg: The operation succeeded.
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| 15:00 | <alkisg> !learn volumes_visible as To prevent volumes (cd, floppy etc) from showing on the user's desktops, run: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.defaults --type boolean --set /apps/nautilus/desktop/volumes_visible 0
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| 15:00 | <ltspbot> alkisg: The operation succeeded.
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| 15:02 | <johnny> alkisg, would be nice to have that only for the thin client users.. and not global
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| 15:03 | <alkisg> I'm using "defaults" so that the teacher can enable it for himself, but yeah, stacking gconf keys per group would be really cool
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| 15:03 | sabayon already does it, but it'd be better if it was embedded
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| 15:03 | I think gsettings will support that.
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| 15:04 | <johnny> yes.. i'm eagerly awaiting gsettings
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| 15:04 | tired of gconf
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| 15:04 | dconf + gsettings will be better
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| 15:05 | * vagrantc scribbles on the future notepad | |
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| 15:34 | <sharles> New to LTSP; need recommendations for inexpensive thin clients for offices running web browser, openoffice, gnucash and scribus
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| 15:35 | <johnny> inexpensive?
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| 15:35 | that's relative
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| 15:35 | i spend $200 a piece for dual core atoms with 2GB ram
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| 15:35 | <sharles> under $150
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| 15:35 | where?
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| 15:36 | <johnny> they didn't have any cdroms tho
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| 15:36 | newegg
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| 15:36 | <sharles> brand?
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| 15:36 | <johnny> msi wind
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| 15:36 | check out disklessworkstations
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| 15:36 | <sharles> slcik
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| 15:36 | oops -- slick
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| 15:36 | <johnny> they sponsor ltsp
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| 15:38 | <johnny> sharles, usually the channel starts to die down in activity at this point
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| 15:38 | might be best to post to ltsp-discuss list
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| 15:39 | !discuss
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| 15:39 | <ltspbot> johnny: Error: "discuss" is not a valid command.
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| 15:39 | <johnny> !ltsp-discuss
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| 15:39 | <ltspbot> johnny: "ltsp-discuss" :: at https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
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| 15:39 | <johnny> that way you'll get a wider audience
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| 15:39 | <sharles> thanks!
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| 15:39 | <johnny> perhaps you should read the archives first tho
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| 15:39 | see if somebody answered your question already
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| 15:39 | <sharles> yup--will do
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| 15:57 | <vbundi> anyone here use sabayon much?
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| 15:58 | <boojum> i'm interested, too.
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| 15:59 | <vbundi> I've used it, I can help you with basic stuff maybe, but I'm having a problem atm
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| 15:59 | <boojum> read someplace it's a resource hog
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| 15:59 | <alkisg> !seen sbalneav
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| 15:59 | <ltspbot> alkisg: sbalneav was last seen in #ltsp 1 week, 5 days, 4 hours, 19 minutes, and 7 seconds ago: <sbalneav> win 1
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| 16:00 | <vbundi> oh man
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| 16:00 | looks like he expert's on vacation :)
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| 16:00 | <johnny> resource hog?
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| 16:00 | how can it be a resource hog?
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| 16:01 | it doesn't do that much after login
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| 16:01 | <vbundi> it only uses resources when it's running it's little bubble when you are configuring stuff
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| 16:01 | <alkisg> boojum: sabayon the desktop locking program, not the distro...
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| 16:01 | <vbundi> and it's not bad afaik
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| 16:01 | <johnny> it should probably be renamed to gnome lockdown or somethin
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| 16:01 | <boojum> alkisg: yup -- think the post conflated the two
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