IRC chat logs for #ltsp on irc.libera.chat (webchat)

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Channel log from 29 January 2012 (all times are UTC)

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11:22	<map7_> can anyone help me with the error: 'mounting /dev/nbd0 on /rofs failed: Input/output error' on the pxe machine on boot?
11:23	<alkisg> distro/version?
11:23	<map7_> mythbuntu 11.10 64bit, LTSP 5.2.16
11:24	<alkisg> Hmmm I don't remember if 11.10 has named nbd exports or not... what does this give you? grep nbd /etc/inetd.conf
11:24	<map7_> yeah it's nbd
11:24	It's on port 2000
11:24	<alkisg> The difference is "port based" vs "named based"
11:24	What's the actual output?
11:25	(copy/paste please...)
11:25	<map7_> 2000 stream tcp nowait nobody /usr/sbin/tcpd /usr/sbin/nbdrootd /opt/ltsp/images/i386.img
11:25	<alkisg> OK, and: ls -l /opt/ltsp/images/i386.img
11:25	<map7_> -rw-r--r-- 1 root root 1064415232 2012-01-29 19:55 /opt/ltsp/images/i386.img
11:26	<alkisg> and: grep append /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default
11:27	<map7_> append ro initrd=initrd.img quiet splash nbdname=ltsp_i386
11:27	<alkisg> So your pxelinux.cfg/default is using name-based nbd, while your inetd.conf uses port-based
11:27	Is that an upgrade?
11:28	<map7_> no I've been trying to get the nbd working so I edited the inetd.conf file myself
11:28	so should there be anything in inetd.conf?
11:28	for nbd
11:28	<alkisg> Only the nbdswapd line
11:28	For swapping
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11:29	<alkisg> cat /etc/nbd-server/config
11:29	<map7_> [generic]
11:29	user = nobody
11:29	group = nogroup
11:29	oldstyle = true
11:29	[ltsp_i386]
11:29	exportname = /opt/ltsp/images/i386.img
11:29	readonly = true
11:29	port = 2000
11:29	I changed that as well
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11:30	<map7_> So should I be using the named nbd setup instead of port?
11:30	<alkisg> Yes, since your ubuntu version uses that by default
11:30	Unless you have a specific reason to change it
11:30	You can use that config instead: http://paste.ubuntu.com/821115/
11:30	<map7_> ok i'll use the default
11:30	<alkisg> Restart nbd and inetd after the changes
11:31	<map7_> ah that was the default config, i have a backup of that
11:33	done, I'm just rebooting the pxe client now
11:33	ok now I'm getting a different error
11:34	Error: Socket failed: Connection refused [chef]
11:34	<alkisg> That was the inital error you were getting?
11:34	*initial
11:34	<map7_> yes
11:34	minus the chef part
11:34	<alkisg> OK, it's probably a network access problem
11:34	hosts.allow, firewalls etc
11:35	Check that port 10809 is open
11:35	<map7_> I can get a standard ltsp-client-build working, but not a mythbuntu client
11:35	<alkisg> sudo netstat -nap \| grep :10809
11:35	Is nbd-server listening there?
11:36	<map7_> yes it is
11:36	<alkisg> Do you have an /etc/nbd-server/allow file?
11:36	<map7_> no
11:37	here is the command I use to build my client image: ltsp-build-client --mythbuntu --mythbuntu-user-credentials "mythclient":"mythclient" --copy-package-lists --copy-sourceslist --accept-unsigned-packages --arch i386
11:37	<alkisg> Do you have a firewall running?
11:37	<map7_> no
11:38	<alkisg> If you run `telnet localhost 10809` from your server, what do you get?
11:38	<map7_> Trying 0.0.42.57...
11:38	telnet: Unable to connect to remote host: Invalid argument
11:38	<alkisg> localhost is 0.0.42.57?!
11:38	<map7_> wrong sorry
11:38	Trying 127.0.0.1...
11:38	Connected to localhost.
11:38	Escape character is '^]'.
11:38	NBDMAGICIHAVEOPT
11:39	<alkisg> OK, and if you try from another pc, telnet server-ip 10809 ?
11:39	<map7_> Trying 10.1.1.105...
11:39	Connected to 10.1.1.105.
11:39	Escape character is '^]'.
11:39	now it just hangs there
11:40	<alkisg> Do you have any of those files? /etc/hosts.allow, /etc/hosts.deny ?
11:40	<map7_> no
11:40	i mean yes both
11:40	<alkisg> What are their contents?
11:40	Maybe you're blocking your subnet...
11:41	<map7_> allow has one line: nbdrootd: ALL: keepalive
11:41	<alkisg> Or, try to temporarily remove both of them
11:41	<map7_> deny has everything remarked out
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11:42	<alkisg> Something is blocking the access to your nbd-server
11:42	<map7_> ok, just rebooting the pxe-machine now
11:42	still getting the same error
11:42	<alkisg> Yes if everything was commented out it wasn't that
11:43	It's something else... maybe even on your switch, if it's managed, etc
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11:43	<map7_> if I build a standard ltsp client it does work
11:44	<alkisg> Hmm maybe the client then tries to connect to another port
11:45	<map7_> using 'sudo ltsp-build-client --arch i386' allows my PXE machine to boot
11:45	<alkisg> Maybe mythbuntu inserts a broken initramfs script
11:45	Do you get an initramfs prompt in the client?
11:45	initrams>
11:45	<map7_> i'm dropped into a busybox terminal
11:45	yeah it says (initramfs)
11:46	<alkisg> OK let me search the named-based nbd-client command line..
11:46	<map7_> It has to be something to do with the mythbuntu. I have a working server in the house with PXE boot working (same setup) I don't know how I got it to work though
11:47	<alkisg> I haven't heard any developer supporting mythbuntu recently though
11:47	I wouldn't wonder if it's broken
11:47	<map7_> Well I've got it working twice over the last four days I've been working on it, but I don't know what I did to get it working
11:48	so I know it's possible but I want to know what I did to fix it, so I can document it and do it again
11:48	I've got a working system, so I've been trying to cheat off it
11:48	so if we need to check the working system I can do that
11:49	<alkisg> nbd-client server-ip /dev/nbd0 -N ltsp_i386
11:49	Replace server-ip
11:49	What does this tell you?
11:50	<map7_> Error: Cannot open NBD: Permission denied
11:50	Please ensure the 'nbd' module is loaded.
11:50	Exiting.
11:50	But I have done a 'modprobe nbd'
11:50	on the server
11:50	<alkisg> No, on the client
11:51	<map7_> I did the nbd-client command on the client
11:51	<alkisg> Try modprobe nbd on the client before issuing the command
11:51	<map7_> I just typed the command on the pxe-client and got 'Negotiation'
11:52	<alkisg> So mythbuntu has a broken initramfs script
11:52	Try putting the other, working initramfs, to /var/lib/tftpboot/ltsp/i386/initrd
11:52	Wait
11:52	<map7_> ok
11:52	<alkisg> Maybe I misunderstood something
11:53	Did you have to run modprobe on the client, to get nbd-client negotiating?
11:53	<map7_> first time I ran that nbd-client command it was on my notebook (ie: not the pxe-client)
11:53	<alkisg> Or you were trying those on the server, and that's why they failed?
11:53	<map7_> I did not have to run modprobe on the pxe-client to get to negotiation
11:54	<alkisg> I see. OK, second try, put break=mount in pxelinux.cfg/default, and reboot client
11:54	(as a kernel parameter)
11:55	The client will give you an initramfs prompt again. Wait 5 seconds and then press ctrl+d
11:55	What happens then?
11:56	<map7_> ok, just waiting for the pxe machine to time out and get to the prompt
11:56	<alkisg> It shouldn't need to timeout...
11:57	break=mount drops you to the prompt immediately
11:57	<map7_> oh yeah
11:57	nice
11:57	ok when I hit Ctrl + d now it repeats the socket failed error
11:58	I have access to the working mythbuntu server which we could cheat off
11:58	<alkisg> Wait wait wait
11:58	You didn't build the chroot in the same server?
11:59	<map7_> what do you mean?
11:59	<alkisg> I want to see if the contents of the initramfs are the same as in ubuntu 11.10
11:59	And not some older version
11:59	If you build the chroot in a mythbuntu 10.04 server, and then moved it to a 11.10 server, it would cause problems
11:59	Anyway let's see the actual contents:
12:00	<map7_> this is a fresh mythbuntu 11.10 install
12:00	and a fresh chroot image built on that machine today
12:00	<alkisg> mkdir /tmp/i
12:00	cd /tmp/i
12:00	zcat /var/lib/tftpboot/ltsp/i386/initrd.img \| cpio -i
12:00	And then put scripts/ltsp_nbd to pastebin
12:01	So, your server has a mythbuntu OS, and a mythbuntu chroot. No other servers or chroots involved. Correct?
12:01	You didn't move the image anywhere else...
12:01	(or the kernels...)
12:02	<map7_> correct
12:03	<alkisg> OK, put ltsp_nbd to pastebin...
12:03	Ah, and another though
12:03	t
12:03	<map7_> where is ltsp_nbd located
12:03	<alkisg> Maybe your dhcp is wrong and is pointing you to the wrong server
12:03	Go to the initramfs prompt again
12:03	And run: cat /tmp/net-eth0.conf
12:03	Check ROOTSERVER there
12:03	Is that your server IP?
12:04	<map7_> yes it is the correct server
12:04	10.1.1.105
12:04	<alkisg> OK follow the commands I said above, to paste ltsp_nbd
12:04	The mkdir and all the rest
12:04	On the server
12:05	<map7_> this ltsp_nbd: /opt/ltsp/i386/etc/initramfs-tools/hooks/ltsp_nbd
12:05	<alkisg> No, get it as I said above
12:05	With mkdir, cd, zcat. You'll find it at /tmp/i/scripts/ltsp_nbd then
12:05	<map7_> yep see it now
12:06	<alkisg> !pastebin
12:06	<ltsp> alkisg: pastebin: the LTSP pastebin is at http://ltsp.pastebin.com. Please paste all text longer than a line or two to the pastebin, as it helps to reduce traffic in the channel. Don't forget to paste the URL of the text here.
12:06	<map7_> http://pastie.org/3275516
12:08	<alkisg> If I didn't misunderstand you at any point, then what you're saying is very strange
12:09	At the paste you posted, at line 105, the client is supposed to run the nbd-client command I told you to do manually
12:09	And you're saying that it fails from a script, but it succeeds manually
12:09	I can't believe that happens, so we're missing something else
12:10	OK, quick way around it, do you have a working initrd from your other non-mythbuntu try?
12:10	Does it have the same kernel there?
12:11	<map7_> yes I just did a uname -a in both server & chroot and both are on 3.0.0-12
12:11	<alkisg> (01:58:21 μμ) map7_: I have access to the working mythbuntu server which we could cheat off ==> what do you mean by that?
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12:12	<alkisg> (01:46:43 μμ) map7_: It has to be something to do with the mythbuntu. I have a working server in the house with PXE boot working (same setup) I don't know how I got it to work though
12:13	==> That's what I meant, to try to get the initrd from the working server
12:13	And put it in /var/lib/tftpboot...
12:13	<map7_> ah ok
12:13	yes I have a separate server which is working
12:13	<alkisg> OK, copy the /var/lib/tftpboot/ltsp/i386/initrd.img* as long as it's the same kernel version
12:14	<map7_> it's a different kernel
12:14	3.0.0-15
12:15	<alkisg> Hmmm try it anyway, it may hang later on though
12:16	<map7_> ok
12:17	should i reboot the pxe client now
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12:17	<alkisg> Yes
12:17	(check that the initrd.img symlink is pointing to your new kernel, ok?)
12:17	<map7_> didn't work
12:18	<alkisg> ls -l /var/lib/tftpboot/ltsp/i386/
12:18	<map7_> yes the symlink is linking correctly
12:18	to initrd.img
12:18	<alkisg> From initrd.img to your new kernel
12:18	Not "to" initrd.img
12:19	*to your new initramfs, sorry
12:19	<map7_> initrd.img -> initrd.img-3.0.0-15-generic
12:19	<alkisg> Yeah
12:19	And still if you run that from the initramfs prompt, it works? nbd-client server-ip /dev/nbd0 -N ltsp_i386
12:21	<map7_> if I run that on the pxe-client I get
12:21	Negotiation:
12:21	and it just sits there, same as before
12:21	is that what is suppose to happen?
12:21	<alkisg> No
12:22	After that you should be seeing "block size =xxx, image size =xxx" etc
12:22	I.e. that the nbd disk was mounted
12:22	I can understand it sitting there, since you said that with telnet it hanged too
12:22	But I can't understand why it says connection refused, if it tries the same server
12:24	Debugging ltsp_nbd would come next, but it's quite difficult to do it over IRC
12:24	<map7_> it's weird that I've been able to get this working twice, once with using this exact server
12:24	and the same client
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12:25	<alkisg> A dhcp problem would explain that, but you're saying that ROOTSERVER is correct, so I don't know
12:25	<map7_> If I build a standard thin client it will work
12:25	so all the linkages must be correct, and it must have something to do with the mythbuntu flags
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12:25	<alkisg> Btw why mythbuntu instead of a fat client with anything you want in it?
12:26	!fatclients
12:26	<ltsp> alkisg: fatclients: You may find some info about the Ubuntu/LTSP implementation of fat clients at https://help.ubuntu.com/community/UbuntuLTSP/FatClients
12:26	<alkisg> The fat client plugin is more supported...
12:26	<map7_> well I tried a fat client and it wouldn't build because of network-manager
12:26	so I didn't give it enough time
12:26	is that problem a quick fix
12:27	<alkisg> There's a bug report about it, it broke in 11.10, we fixed it later, and there's a patch in the bug report about it
12:27	You just need to modify a line in your server's ltsp plugins
12:28	<map7_> ok maybe I could try that and see if that boots
12:28	if that booted all I would need to do is install mythfrontend and I'll be where I want to be basically
12:28	<alkisg> http://bazaar.launchpad.net/~ltsp-upstream/ltsp/ltsp-trunk/revision/1944
12:29	That's the fix you need, to prevent ltsp from blacklisting network manager etc
12:29	(or just try 12.04, it's fixed there)
12:32	<map7_> ok to apply that patch I would need to download the ltsp package, apply patch and compile, then make my fat client image?
12:33	<alkisg> No
12:34	You'd need to modify the fat clients plugin in your server, /usr/share/ltsp/plugins/ltsp-build-client/Ubuntu/030-fat-client
12:34	Then build the client,
12:34	Then modify ltsp_nbd in the chroot, and call update-initramfs -u in the chroot,
12:34	and ltsp-update-kernels outside the chroot
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12:42	* map7_ building fat-client
12:44	<map7_> alkisg, thanks for your help so far, it's been really hard to pin point exactly what is causing this problem
12:45	and sometimes it starts working
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12:45	<map7_> twice in fact
12:45	<alkisg> We'd need to look at the mythbuntu plugin too, and I don't want that as I never use it :)
12:45	I don't know who maintains it actually
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12:46	<map7_> I know it was taken out of the mythbuntu control center in mythbuntu 904
12:46	and it hasn't been back in there since
12:47	but I've been using the command line switch in mythbuntu 10.04 fine for the last year and a half
12:47	I've just decided to upgrade to 11.10 for a few extra features and I've hit this problem
12:49	<alkisg> Good luck with the rest, bye for now
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12:50	<map7_> alkisg, thanks
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19:16	<alkisg> At many places we're trying to discover the ssh pid, the ltsp client hostname, ip address, the client $DISPLAY etc
19:16	And we go through hoops to get them
19:16	Wouldn't it be easier instead of just "echo LTSPROCKS; /bin/sh -", to do something like:
19:17	"echo LTSPROCKS; echo ...a bunch of useful vars > ~/.ltsp-connection-$IP; exec /bin/sh -" ?
19:17	Then we'd just look at the user's home dir and have everything ready...
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20:02	<laurei> :( updated the software in the chroot image now audio on all fat clients isn't working, no hardware device
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20:40	<Hyperbyte> laurei, what exactly did you update in the chroot image?
20:46	<laurei> apt-get update and apt-get upgrade
20:48	sounds like just an 11.10 problem, so I'm going to try http://dharmendralinuxdiary.blogspot.com/2011/10/ubuntu-1110-sound-problem.html. not sure how it's going to affect a fat client though as my understanding is still lacking.
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21:14	<Hyperbyte> laurei, why did you do that in your chroot?
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23:50	<asmok> i got problems with Debian (6.0.3 i386) and nVidia Vanta, old IBM (nVidia Corporation NV6 [Vanta/Vanta LT] (rev 15) - should it work with xsever = nv, I got black screen, blinking cursor
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