IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 19 February 2011 (all times are UTC)
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| 06:13 | <Hyperbyte> I have to share some story with you guys. I'm not a big fan of writing personal stories in serious chatrooms like this, but it's just too hilarious.
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| 06:14 | I wanted to mess/experiment a little with our LTSP server here. So I thought I'd work a little on a saturday to get the chance to mess around without people working here.
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| 06:15 | So I'm sitting in my office here, on an empty floor, radio at the highest volume, singing along, etc...
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| 06:15 | <zamba> after upgrading the tc server, i'm unable to boot any clients
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| 06:15 | get an error about forbidden directory
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| 06:15 | <Hyperbyte> Suddenly someone in a very clean suit stands in my office doorway, looks very seriously at me... I turn down the radio and he says "How the hell did you get in here? Didn't you know we're doing asbestos removal today?!"
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| 06:15 | Heh.
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| 06:15 | <zamba> when tftp-ing
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| 06:16 | <alkisg> Heh
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| 06:16 | <Hyperbyte> Turns out they forgot to close off the personell entry I always use... they haven't started yet though, he gave me 1 hour to finish my work and clear out.
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| 06:16 | <alkisg> zamba: https://help.ubuntu.com/community/UbuntuLTSP/Troubleshooting/TFTP
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| 06:18 | <zamba> yeah, got the bug with the files going to /srv/ instead
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| 06:20 | hm
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| 06:20 | but still no luck
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| 06:20 | access violation and forbidden directory
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| 06:21 | oh, nevermind.. /etc/default points to /srv
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| 06:29 | but still the same error
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| 06:29 | forbidden directory
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| 06:30 | happens also if i try tftp <host> -v -m binary -c get /ltsp/i386/pxelinux.0
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| 06:32 | <alkisg> zamba: did you restart tftpd?
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| 06:33 | <zamba> alkisg: several times
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| 06:33 | <alkisg> How? not with inetd...
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| 06:33 | <zamba> stop/start/restart tftpd-hpa
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| 06:34 | <alkisg> Right
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| 06:34 | and /var/lib/tftpboot/ltsp/i386/pxelinux.0 is there and accessible by non-root users?
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| 06:35 | <zamba> $ ls -l /var/lib/tftpboot/ltsp/i386/pxelinux.0
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| 06:35 | -rw-r--r-- 1 root root 14776 2011-02-19 11:57 /var/lib/tftpboot/ltsp/i386/pxelinux.0
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| 06:35 | i also tried putting a file called duh into /var/lib/tftpboot/, same problem there
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| 06:35 | Error code 2: Forbidden directory
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| 06:36 | ah!
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| 06:36 | there
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| 06:36 | had to include --secure
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| 06:36 | <alkisg> Right
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| 06:36 | <zamba> didn't have that option.. what does it mean?
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| 06:36 | <alkisg> I wrote that in the wiki page too :D
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| 06:36 | It means to chroot in /var/lib/tftpboot before serving files
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| 06:37 | Otherwise you'd need to use `tftp /var/lib/tftpboot/file...`, the whole path
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| 06:37 | (but it does that for security, not just for the paths)
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| 06:39 | <zamba> hm, ok.. i see
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| 06:39 | but still another problem here..
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| 06:40 | it just loads and loads
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| 06:40 | i've looked at the splash screen for several minutes now
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| 06:44 | <alkisg> remove "quiet splash" from pxelinux.cfg/default
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| 06:44 | Or press [Esc]
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| 06:44 | <zamba> way ahead of you :)
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| 06:44 | <alkisg> And see what error messages there :)
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| 06:44 | <zamba> found the error
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| 06:44 | dhcp problems
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| 06:44 | <alkisg> nbd?
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| 06:44 | Right
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| 06:45 | <zamba> my dhcpd has been acting up after the upgrade to squeeze
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| 06:45 | Feb 19 13:47:48 fused dhcpd: DHCPREQUEST for 192.168.1.222 (192.168.1.1) from 00:02:55:2b:29:6e via eth1: lease 192.168.1.222 unavailable.
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| 06:45 | Feb 19 13:47:48 fused dhcpd: DHCPNAK on 192.168.1.222 to 00:02:55:2b:29:6e via eth1
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| 06:45 | lots of these in the syslog
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| 06:45 | have no idea what's going on, really
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| 06:46 | maybe just wipe the dhcpd.lease file and restart the dhcpd?
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| 06:46 | <alkisg> Do you have another dhcp server running ?
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| 06:48 | <zamba> nope
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| 06:51 | <alkisg> zamba: ah, what's your distro/version exactly again? squeeze server, and squeeze chroot?
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| 06:53 | <zamba> alkisg: the main dhcp/router is debian squeeze
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| 06:53 | <alkisg> And the chroot?
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| 06:53 | <zamba> ubuntu
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| 06:53 | the tc server is also ubuntu
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| 06:53 | <alkisg> Which ubuntu version?
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| 06:53 | <zamba> lucid
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| 06:54 | <alkisg> There's a bug in the lucid udhcpc client and in the ltsp_nbd script
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| 06:54 | <zamba> oh?
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| 06:54 | btw.. xkblayout doesn't work
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| 06:54 | in lts.conf
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| 06:55 | <alkisg> It doesn't send a clientid, so maybe the dhcp server thinks it's a different client each time
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| 06:55 | XKBLAYOUT=what?
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| 06:56 | <zamba> no
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| 07:10 | <zamba> is it possible to get automatic guest login?
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| 07:10 | meaning.. the tc logs on with the same username/password as the hostname of the tc?
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| 07:12 | <alkisg> Sure, LDM_AUTOLOGIN=True
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| 07:22 | <zamba> alkisg: that's what i got
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| 07:23 | alkisg: but i have to define LDM_USERNAME and LDM_PASSWORD for every machine
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| 07:23 | and another huge problem here.. the machine doesn't come back up after the screen has been blanked
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| 07:23 | <alkisg> I think these default to the hostname
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| 07:24 | <zamba> alkisg: ok, i'll try without specifying username and password
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| 07:25 | but as i said.. screensaver basically breaks the whole tc
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| 07:26 | it doesn't resume after that
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| 07:26 | and it's just a blank screen
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| 07:26 | <zamba> wonder if it's the screen locking
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| 07:26 | how can i disable that globally?
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| 08:09 | <zamba> do i have to set enforced gconf settings in the chroot?
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| 08:21 | <alkisg> zamba: no, not in the chroot, on the ltsp server
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| 08:21 | But screensaver for ltsp is just a blank screen
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| 08:22 | It shouldn't cause such problems
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| 08:23 | <zamba> alkisg: the problem was the password prompt
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| 08:23 | alkisg: if i disabled that, everything worked
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| 08:23 | but i'm not able to set that mandatory
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| 08:23 | <alkisg> Why?
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| 08:23 | With gconf-editor => mandatory editor
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| 08:23 | Or with gconftool-2
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| 08:23 | "set as mandatory" I think it's called in gconf-editor
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| 08:47 | <zamba> alkisg: i've tried that
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| 08:47 | alkisg: but the changes aren't set mandatory
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| 08:47 | of course.. :p
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| 08:47 | do i have to restart all gnome sessions for this to be activated?
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| 08:47 | <alkisg> zamba: mandatory settings work well with gnome
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| 08:48 | Other users would need to log out + back in
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| 08:48 | If you did that correctly and it's not working, then maybe you set the wrong key?
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| 08:50 | <zamba> i set /apps/gnome-power-manager/lock/blank_screen to false
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| 08:50 | when i open gconf-editor i see that that key is not writable
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| 08:50 | GConf Error: Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See http://projects.gnome.org/gconf/ for information. (Details - 1: Failed to get connection to session: Failed to connect to socket /tmp/dbus-WZ328a9sze: Connection refused)
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| 08:50 | hm
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| 08:51 | but i get that when i run gconf-editor as a regular user?
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| 08:51 | could that be related?
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| 08:51 | <alkisg> zamba: cat /etc/gconf/gconf.xml.mandatory/%gconf-tree.xml
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| 08:52 | If the options are there, they are mandatory
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| 08:52 | If there's nothing there, it didn't work OK
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| 08:52 | <zamba> http://pastebin.com/c2rB82zp
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| 08:52 | and that's NOT in the chroot, right?
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| 08:52 | but on the tc server itself
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| 08:54 | <alkisg> It should be "/desktop/gnome/lockdown", not "/apps/gnome/lockdown"
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| 09:15 | <zamba> alkisg: but that's not related.. but could that wrong key prevent the other settings from being loaded?
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| 09:18 | <alkisg> zamba: the other settings are not enough
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| 09:18 | Reads the comments on gconf-editor about the keys you're setting
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| 09:28 | <zamba> Whether the screen is locked when the screen is turned off. Only used if lock_use_screensaver_settings is false.
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| 09:28 | you mean that?
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| 09:29 | can't find locl_use_screensaver_settings no where
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| 09:30 | <zamba> maybe it's lock_enabled under apps/gnome-screensaver/ i'm looking for?
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| 09:32 | nah, that should be enough
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| 09:32 | use_screensaver_settings isn't set
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| 09:48 | <zamba> how can i enable remot access to all tc?
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| 09:48 | i basically need a way t connect to them (oer vnc) to see what the users are doing
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| 09:48 | and help out with issues
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| 10:03 | <alkisg> italc.sf.net
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| 10:03 | So basically `sudo apt-get install italc-master`, and a log off/log on for everyone
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| 12:01 | <zamba> alkisg: but what if i want to use remote desktop and vnc instead?
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| 12:02 | <alkisg> zamba: well you can, but since all processes are on the server, you need to use different ports for each user
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| 12:02 | vino-server, the gnome vnc server, does that automatically afaik
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| 12:02 | <alkisg> So you can enable that. You'll need passwords of course, unless you want all students to be able to connect to others :)
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| 12:03 | <zamba> alkisg: but i still have to connect through different ports?
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| 12:03 | <alkisg> Another possibility is to install x11vnc to the chroot
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| 12:03 | zamba: yes
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| 12:03 | If you install x11vnc to the chroot, then no, you don't
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| 12:03 | <zamba> ok, so it's basically a non-deterministic way of connecting to a particular desktop..?
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| 12:03 | yeah, that sounds like a better solution
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| 12:03 | <alkisg> Well, you'd need a script for autodetection
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| 12:03 | italc has that embedded
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| 12:04 | I.e. it autodetects the client ports
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| 12:04 | <zamba> yeah, but then i need the italc-master instance to connect to them.. and also that key management stuff
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| 12:04 | <alkisg> Why, you have static IPs for your clients?
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| 12:04 | Aren't your IPs random too?
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| 12:04 | The key management is automatic
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| 12:04 | <zamba> alkisg: well, i have dns names
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| 12:04 | <alkisg> It's really, just one `apt-get install italc-master`
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| 12:04 | Nothing more at all.
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| 12:05 | <alkisg> You just need to be lucky for italc not to crash on you :)
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| 12:05 | <zamba> and if i want to connect to one of the tcs from one random machine, then what?
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| 12:05 | with random machine i mean a machine that's not part of the tc environment
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| 12:05 | <alkisg> ssh -X to the server and run italc?
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| 12:05 | <zamba> ah
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| 12:05 | <alkisg> Or transfer keys, whatever you prefer
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| 12:06 | Or fire up a vm thin client
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| 12:06 | <zamba> i can more or less guarantee you that it won't work that nicely for me :)
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| 12:06 | <alkisg> The automation part works just fine
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| 12:06 | <zamba> how do i fire up a vm thin client?
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| 12:06 | <alkisg> It's the italc networking backend which crashes for some labs
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| 12:06 | apt-get install virtualbox, create new client without disk, start client
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| 12:06 | Very easy
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| 12:07 | <zamba> doesn't that mean that every user can launch italc and see all other machines?
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| 12:07 | <alkisg> No, only members of the admin group have access to the private keys
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| 12:07 | <zamba> ah, ok
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| 12:08 | another question.. is it possible to simulate/emulate a session for a random user?
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| 12:08 | remotely?
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| 12:08 | <alkisg> I don't get it, how would that be different from a VM client?
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| 12:10 | <zamba> i was thinking something like ssh -X to the server as a user and then launch a session.. like 'gnome-session' or whatever
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| 12:11 | <alkisg> What about sending sound remotely with pulseaudio, ltspfs etc?
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| 12:11 | A VM client takes care of those too.
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| 12:11 | If you want to just have a session, you can use X -query
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| 12:12 | But that's not LTSP
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| 12:24 | <zamba> i just need to check the mandatory gconf settings
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| 12:25 | to see if they actually has any effect
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| 12:25 | have*
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| 12:29 | any way i can set the next-server manually?
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| 12:29 | i'm in a different network now, so i can't boot off the same dhcp
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| 12:31 | <alkisg> Just put it in a gpxe script
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| 12:31 | Use google translate on that message: http://users.sch.gr/alkisg/tosteki/index.php?topic=1451.msg24373#msg24373
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