IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 28 February 2015 (all times are UTC)
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| 04:34 | <metal-machine> alkisq: I am not able to login thin clients. I am using NFS. here is the output for "grep -r ^Exec /usr/share/xsessions"
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| 04:34 | http://pastebin.com/520Kex4H
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| 05:11 | Is it problem with NFS configuration?
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| 06:36 | <metal-machine> hello still not able to login from thin-client
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| 06:36 | any one there?
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| 06:36 | :(
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| 06:52 | <work_alkisg> metal-machine: run this on the server: tail -f /var/log/auth.log
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| 06:52 | work_alkisg is now known as alkisg | |
| 06:53 | <alkisg> Then try to login on the thin client, and check the server again to see if you got a successful login message
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| 06:58 | <metal-machine> no i am not getting successful login, the error is something like
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| 06:58 | pam_unix(su:auth):conversation failed
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| 06:58 | pam_unix(su:auth): auth could not identify password for [root]
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| 06:59 | pam_authenticate:Authentication failure
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| 06:59 | FAILED su for root by test1
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| 07:00 | - /dev/pts/2 test1:root
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| 07:04 | [now again tried to boot thin client and new message appears ]
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| 07:05 | root-server sshd[4553] Connection closed by 192.168.0.201 [preauth]
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| 07:10 | Ok that means the problem is with openssh?
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| 07:17 | <metal-machine> Any idea?
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| 07:18 | <alkisg> metal-machine: are you trying to login as root?
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| 07:19 | metal-machine: it might be an issue with your ssh keys
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| 07:19 | !ltsp-update-sshkeys
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| 07:19 | <ltsp`> ltsp-update-sshkeys: If you changed your server IP, you need to run ltsp-update-sshkeys, and if you're using NBD (Ubuntu) you also need ltsp-update-image afterwards
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| 07:19 | <alkisg> you can also try this:
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| 07:19 | !screen_08
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| 07:19 | <ltsp`> screen_08: To get a root shell on a Debian thin client, put SCREEN_07=ldm, SCREEN_08=shell and SCREEN_DEFAULT=07 to lts.conf.
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| 07:20 | <metal-machine> I am using Debian wheezy with NFS
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| 07:21 | <alkisg> I know
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| 07:21 | So try those 2 sentences, but don't try the ubuntu part
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| 07:21 | <metal-machine> first I run this on root server: ltsp-update-sshkeys 192.168.0.106 debian-app-01
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| 07:22 | ltsp-update-sshkeys
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| 07:22 | the both of above run without errors
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| 07:22 | <alkisg> Then you need LDM_SERVER=ip
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| 07:23 | The default name for the LTSP server is "server", so the client ssh doesn't know and doesn't trust server when you've only put its ip and dns in the keys
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| 07:23 | Either name .106 as "server" in your /etc/hosts, and run ltsp-update-sshkeys with "server", or change LDM_SERVER
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| 07:24 | <metal-machine> ok I am trying with first
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| 07:26 | ok trying to boot thin client
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| 07:27 | One more thing I want to confirm . I am creating users in .106.
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| 07:28 | is that fine or I have to make only in root server(.105)?
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| 07:28 | <alkisg> The root server is only serving NFS, right?
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| 07:29 | If so, you don't need users there, unless you're using nfs4 with authentication etc
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| 07:30 | <metal-machine> Root server is serving boot image. I am sending you the setup
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| 07:31 | <alkisg> No need, try the ssh keys, it's probably that
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| 07:32 | <metal-machine> I used that. Please have a look. I did the same as in setup
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| 07:32 | http://pastie.org/9988946
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| 07:33 | I feel I am missing some nfs setup part
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| 07:35 | <alkisg> Did you get a shell at screen08?
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| 07:37 | <metal-machine> trying...
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| 07:37 | <alkisg> When you get a local root shell on a client, try those:
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| 07:37 | 1) alt+ctrl+f8 to switch to the console
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| 07:37 | 2) getltscfg -a, check the value of SERVER there, or LDM_SERVER
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| 07:38 | 3) ssh user@<exact ip or name of server>
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| 07:38 | 4) It will probably prompt you to trust the ssh keys, which is what is going wrong with your setup
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| 07:38 | Accept the keys
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| 07:38 | 5) Switch again to vt7, alt+ctrl+f7. Now you should be able to log in
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| 07:39 | <metal-machine> aah ok Now i got you. :)
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| 07:39 | <alkisg> I.e. I think that the problem is that the client doesn't trust the server because you're mixing IPs, DNS names, the LTSP special "server" name, your MY_SERVER_LIST, etc
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| 07:39 | If the above 5 steps allow you to log in, you'll be certain that I was "right"...
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| 10:06 | <Heinz2k> Hi for testing purpose im running LTSP on 14.04 Ubuntu LTSP serving a fat client chroot via NBD. That works without problem. However for some reasons i want to switch back to NFS, i have installed all necessary packages and NFS Server works, however my client cant boot the chroot if the export is ro ( permission issues) exporting chroot as rw works well, but thats not what i want. Is there something special i have to change to make n
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| 10:10 | <Hyperbyte> Yes, it is possibly by mounting an overlayfs on top of NFS, that's what LTSP does for NBD as well. Heinz2k, explain your reason for wanting to switch to NFS.
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| 10:16 | <Heinz2k> LTSP is just running on a tiny vm , due to IO Perfomance i want the thin clients to load the chroot from a NFS Share of our local SAN (much better IO Perfomance) ...
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| 10:26 | <Hyperbyte> Sounds like a plan.
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| 10:26 | NFS should be mounted read-only. If it's mounted read-write, clients will get in eachother's way.
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| 10:27 | But the OS needs a read-write root to start from. Solution is the same with NBD (as that is also read-only): LTSP mounts an overlay FS (basically, a ramdisk) on top of the root, where all changes are stored.
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| 10:27 | If the client reboots, all those changes are gone again.
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| 10:59 | <Heinz2k> Thank you
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| 11:00 | so it seems my setup lack overlayfs support
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| 11:02 | <Hyperbyte> Heinz2k, you can check this by typing "mount"
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| 11:02 | Typically, you should see the root nbd/nfs mount
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| 11:02 | And then another root, with overlayfs (or aufs, not sure which LTSP uses)
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| 11:04 | Let me boot a thin client to show you
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| 11:08 | I just sent you a PM here on IRC, with a screenshot of 'mount' output on a virtual thin client
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| 11:08 | Note /dev/nbd0 mounted ro and overlayfs mounted rw
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| 11:09 | LTSP should do this automatically though, for NBD -and- NFS.
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| 11:30 | <Heinz2k> with NBD : overlayfs on / type overlayfs (rw)
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| 11:30 | seems to work
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| 11:30 | client boots fine
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| 11:36 | NFS Fails on bootup : /sbin/init-ltsp/ ........ Permission denied
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| 11:42 | <Hyperbyte> That's different.
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| 11:42 | Permission denied doesn't necessarily mean something is read-only.
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| 11:42 | In this case, I bet it means your NFS permissions aren't set up correctly.
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| 11:43 | You said you were using a NAS... does this NAS preserve Linux file permissions?
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| 11:43 | Or SAN.
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| 11:46 | <Heinz2k> Just testing with local VMs right now (1 Server VM 1 Client VM)
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| 11:47 | h1@ubuntu:/etc$ sudo exportfs /home <world> /opt/ltsp/amd64 <world>
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| 11:49 | ../etc/exports
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| 11:49 | "/opt/ltsp/amd64 *(ro,no_subtree_check,no_root_squash)"
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| 11:50 | tcp 0 0 *:nfs *:* LISTEN root 11876 -
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| 11:51 | <Hyperbyte> Yes, now mount the directory from the SAN.
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| 11:51 | <Heinz2k> Cant .. not at work ;)
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| 11:52 | <Hyperbyte> ...
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| 11:52 | So you're not actually trying to mount NFS from the SAN?
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| 11:52 | But from the local server?
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| 11:52 | <Heinz2k> yes
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| 11:52 | NFS Server is on the local machine
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| 11:52 | (VM)
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| 11:53 | sorry i meant on the LTSP VM
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| 11:55 | <Hyperbyte> !quiet-splash
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| 11:55 | <ltsp`> quiet-splash: to disable the splash screen in Ubuntu, in order to see any boot error messages, run sudo gedit /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default and remove quiet splash plymouth:force-splash vt.handoff=7
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| 11:55 | <Hyperbyte> Forgot all about that, it's been a while since I debugged LTSP. :P
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| 11:55 | You might see some useful error messages when you do that.
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| 12:03 | <Heinz2k> send you the corresponding error messages
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| 12:04 | thank you for ur help so far
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| 12:04 | gotta take care of my child now :) ... but will be online later
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| 12:05 | <Hyperbyte> Sure.
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| 12:06 | I've only once or twice used LTSP with NFS backend, to me, it looks like something is going wrong with overlayfs still...
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| 12:06 | But the problem could be in your lts.conf as well... I'm not sure.
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| 21:11 | <alkisg_web> !4k
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| 21:11 | <ltsp`> 4k: Imagine a 4k display updated at 60 fps. It needs 3840×2160×32×60 bits per second, i.e. 16 gbps. Normal HD displays need 4 gbps. Thin clients will have much trouble getting all that through the local network...
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