IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 24 January 2018 (all times are UTC)
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| 06:31 | <NUMG> Hi there, I have a couple of questions on a brand new installation : Lubuntu 16.04.3 + LTSP-Manager.
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| 06:33 | <alkisg> shoot
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| 06:46 | <NUMG> The first time I booted my ThinClient, everything went OK. But now, I encouter some NBD errors at the startup
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| 06:47 | followed by SQUASHFS error : unable to read directory
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| 06:48 | <alkisg> NUMG: do the errors persist if you restart the server?
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| 06:48 | <NUMG> Yes
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| 06:48 | I tried to restart the server, update the image with no success
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| 06:48 | <alkisg> And the client doesn't boot then?
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| 06:49 | <NUMG> Sometimes it does, it can pass the error, sometimes I got a Kernel Panic and sometimes it failed at starting up some services
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| 06:49 | <alkisg> Are you testing with just one client? Do other clients boot fine?
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| 06:49 | <NUMG> I tried on my thinclient (HP T520) and on VirtualBox VM, same results
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| 06:50 | <alkisg> OK, I can have a look over VNC with the VM if you like
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| 06:50 | !vnc-edide
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| 06:50 | <ltsp> vnc-edide: To share your screen with me, open Epoptes → Help menu → Remote support → Host: srv1-dide.ioa.sch.gr, and click the Connect button
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| 06:52 | <NUMG> Link to VirtualBox screenshot. https://framapic.org/kQndlIdSsM7m/DGdvnM7S8EMf.png
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| 06:52 | Also, it seems that there errors are more frequent on the ThinClient than on the VirtualBox
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| 06:55 | Do you want me to share the screen on the server or on the ThinClient ?
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| 06:56 | <alkisg> NUMG: usually, the server screen, unless it's headless, which will make things a bit harder
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| 06:59 | <NUMG> This is the first time, I am running Epopter and it says that the user "admin" must be a member of the group epoptes.
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| 06:59 | I checked and he is member of this group
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| 07:01 | <alkisg> NUMG: if you added him to the group recently, you need to logout/login to take effect
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| 07:01 | Otherwise, just run this:
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| 07:01 | !vnc-dide
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| 07:01 | <ltsp> vnc-dide: To share your screen with me, run this: sudo apt-get --yes install x11vnc; x11vnc -connect srv1-dide.ioa.sch.gr - this is a reverse connection, it doesn't need port forwarding etc.
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| 07:05 | <alkisg> NUMG: moment, a school called, will get to you in 5 mins
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| 07:05 | <NUMG> OK. I restarted the server, and now I can run epoptes
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| 07:05 | OK
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| 07:05 | No problem
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| 07:13 | <alkisg> NUMG: ah, when you say virtualbox, you mean from another pc?
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| 07:13 | OK, so usually the nbd errors you see mean "bad networking". So it was weird that you were seeing them via virtualbox.
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| 07:14 | But since you're running virtualbox from another pc, then yeah it makes sense, bad networking again
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| 07:14 | I would suggest installing virtualbox or kvm on the server, and test if it happens there
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| 07:15 | <NUMG> Yes, from an other ocmputer
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| 07:16 | That's what I thought : our network is not the best in the world :(
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| 07:17 | I will try to run a VM directly from the ESX Server where the LTSP Server is virtualized
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| 07:17 | <alkisg> OK, ping me if that doesn't work as expected
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| 07:19 | <NUMG> For reference to photos take from the ThinClient HP with Kernel Panic : https://framapic.org/kwwoueFiMrKx/sgCnS4KAgq2F.jpg
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| 07:19 | https://framapic.org/T0KyNburEA8f/AV1oM9naazAT.jpg
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| 07:20 | <alkisg> Some nbd io errors are "normal", you'll see them in the VM too
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| 07:20 | I reported them and they were fixed in the 4.15 kernel
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| 07:20 | But they're harmless
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| 07:20 | Some other nbd errors though, like the "invalid socket" ones, are not expected, and are harmful
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| 07:21 | https://github.com/NetworkBlockDevice/nbd/issues/57#issuecomment-333409103
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| 07:21 | The ones you see there are the harmless ones
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| 07:21 | So up until "unable to read partition table", it's ok
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| 07:23 | NUMG: hmm give me vnc again, I'd like to try reverting to the 4.4 kernel as I do with schools here
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| 07:23 | It may make things more stable
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| 07:23 | <NUMG> VNC or Epoptes ?
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| 07:24 | <alkisg> No difference to me...
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| 07:25 | NUMG: are you able to select another kernel at grub?
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| 07:25 | I.e. do you have something like console access?
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| 07:25 | <NUMG> No. I don't have the GRUB menu displayed :(
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| 07:25 | <alkisg> You're supposed to see it if you hold down shift
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| 07:25 | But I'm not sure if your console will transfer that to the VM
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| 07:25 | <NUMG> Also, I did try with a VMWare on the same ESX, and I don't have any error
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| 07:26 | <alkisg> 4.13 has a whole lot of errors
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| 07:26 | I'm reverting all the schools to 4.4
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| 07:26 | <NUMG> OK
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| 07:26 | <alkisg> And I think 4.4 won't show the Buffer IO errors at all
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| 07:27 | <NUMG> OK
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| 07:28 | Server is starting with 4.4
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| 07:28 | <alkisg> Cool
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| 07:28 | Give me vnc again to remove 4.10/4.13, and then we'll run ltsp-update-image
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| 07:41 | <alkisg> NUMG: so after ltsp-update-image finishes, try booting the clients, and see if you get nbd errors
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| 07:41 | Btw, you need to run apt dist-upgrade, to properly update your server
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| 07:41 | Do it later though
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| 07:43 | <NUMG> OK
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| 07:44 | It seems to be OK. I'm going to try to reboot my ThinClient
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| 07:46 | <alkisg> It should solve the buffer io errors on boot, but it shouldn't really help with network stability, maybe only a bit
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| 07:51 | <NUMG> Now I have the Grub Menu on my ThinClient
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| 07:52 | <alkisg> We don't provide grub over the network, so that sounds very strange :)
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| 07:52 | Check again
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| 07:54 | <NUMG> https://framapic.org/X69a8mb4k1bX/X2YvDv7yVGol.png
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| 07:54 | <alkisg> That's a pxelinux menu
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| 07:54 | It means you enabled the menu from /etc/ltsp/update-kernels
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| 07:54 | <NUMG> Oh OK. I didn't have that before
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| 07:54 | <alkisg> Move the mouse on the server for me to see vnc and verify it
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| 07:55 | (now it's in screensaver mode)
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| 07:55 | PXELINUX_DEFAULT=menu
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| 07:55 | That's normally disabled
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| 07:55 | You enabled it yesterday or something, and it took effect today with ltsp-update-image
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| 07:56 | <NUMG> Maybe yes :) I made somes tests...
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| 07:57 | It seems that I don't have anymore NBD errors on my ThinClients
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| 07:58 | <alkisg> Yes, the 4.4 kernel solved that
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| 07:58 | Cool, keep it that way :)
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| 08:00 | <NUMG> Altough, I still have a problem but only on my ThinClient HP t520. When booting "LTSP, using NBD", it take a long time on the step "Loading vmlinuz-xxx" and a really long time on "Loading initrd-xxx". And, often it restart completely (maybe a timeout). Is this the fault of my cheap network ?
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| 08:01 | <alkisg> Did that client boot before, with the 4.12 kernel, even with errors?
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| 08:01 | <NUMG> No, it was the same
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| 08:01 | <alkisg> Is it 64bit or 32bit?
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| 08:02 | <NUMG> 64
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| 08:02 | <alkisg> Wait when you say "often it restarts", it means that some times it boots?
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| 08:03 | <NUMG> sometimes it boot, and sometimes it stay on "Loading initrd or vmlinuz" during a long time then restart
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| 08:03 | <alkisg> OK then yes I assume it's bad networking
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| 08:03 | Try putting it directly to the switch
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| 08:04 | <NUMG> Is there an option in the PXE Menu where I could switch a verbose parameters to see what's going on ?
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| 08:05 | <alkisg> Sure, press e to edit the menu options, and remove "quiet splash"
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| 08:05 | Nah never mind you don't have quiet splash anyway
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| 08:05 | Try adding "debug", sometimes it produces more output
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| 08:08 | <NUMG> I will have try to do some bandwidth and quality test between my switch and the LTSP server
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| 08:09 | <alkisg> NUMG: epoptes has an integrated bandwidth test
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| 08:09 | <NUMG> Great !
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| 08:09 | Awesome tools
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| 08:09 | <alkisg> Thanks, it took us years to develop them :D
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| 08:10 | NUMG: hehe, 10g on the server, 1 g on the client ==> yet 100 mbps connection
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| 08:11 | Something is indeed wrong between them
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| 08:11 | Maybe the server 10 g is fake and in reality it's just 100 mbps
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| 08:12 | <NUMG> 10G is fake since it's virtualized
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| 08:12 | <alkisg> It's best to give a real estimate to the VM
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| 08:12 | otherwise it attempts to start sending at 10 g
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| 08:12 | and may cause retransmissions
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| 08:12 | <NUMG> Indeed, I will have a look but it seems that the switches are on 100mbps
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| 08:13 | OK
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| 08:14 | <alkisg> The client switch is gigabit, it connected to 1 g
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| 08:31 | <NUMG> I just did an Iperf test on the ThinClient, and I have a 100Mbps bandwidth. Is this enough ?
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| 08:31 | <alkisg> Sure
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| 08:32 | It's the quality that matters
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| 08:35 | <NUMG> In UDP, 0.073ms of Jitter and 0 Lost diagrams !
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| 09:09 | I'm going to do some tests and give you some results after that. Thank you for your help.
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| 19:07 | <Ray_> trying to boot client but errors out (PXE E51)
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| 19:08 | any ideas
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| 19:08 | <vagrantc> dhcp server not configured?
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| 19:08 | or multiple dhcp servers on the same network?
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| 19:10 | <Ray_> i configured dhcp on the /etc/ltsp.dhcpd.conf fi
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| 19:10 | sorry /etc/ltsp/dhcpd.conf
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| 19:11 | <vagrantc> what distro? software version?
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| 19:11 | <Ray_> ubuntu 17.10
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| 19:11 | and ran the root@server #apt install ltsp-manager
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| 19:12 | <vagrantc> i'm not sure if ltsp-manage supports isc-dhcp-server ... typically it uses dnsmasq
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| 19:12 | ltsp-manager
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| 19:13 | !ltsp-manager
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| 19:13 | <ltsp> ltsp-manager: LTSP Manager is a GUI tool that makes LTSP maintenance easy. It's the recommended way to install LTSP in common setups. More info: http://wiki.ltsp.org/wiki/Ltsp-manager
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| 19:13 | <vagrantc> Ray_: those are the install instructions for using ltsp-manager
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| 19:13 | <Ray_> so should i isc-dhcp-server or configure dnsmasq
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| 19:14 | install
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| 19:14 | ahh okay i see
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| 19:16 | <vagrantc> ltsp-manager is made to minimize the number of manual steps
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| 19:17 | <Ray_> okay so i can use ltsp-manager to set up my thin client enviroment
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