IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 4 March 2021 (all times are UTC)
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| 12:15 | <sfrank> bonjour
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| 12:16 | hello
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| 12:16 | hello
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| 12:19 | robsitz has joined IRC (robsitz!4f24b839@host-79-36-184-57.retail.telecomitalia.it) | |
| 12:27 | <sfrank> I try to boot my raspberry for the first time on NFS_RW. The PXE boot is done but the image does not mount. I receive an error message:
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| 12:27 | "Kernel panic - not syncing: VFS: unable to mount root fs on unknown-block (2,0)"
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| 12:27 | I redid the image by scrupulously following the documentation but I have the same error.
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| 12:27 | I am using a raspberry pi 3B without an SD card. A power supply for telephone. The server is an Ubuntu 20.04LTS.
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| 12:27 | Can you help me ?
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| 12:29 | the server in on vitualbox VM
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| 12:56 | <antaresgades> Hello. I'm trying an installation on a 2-nic server. I have an issue connectiong to internet from the rpi clients. I can ping to the server both NIC but can't ping to 8.8.8.8
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| 12:56 | On the server, ltsp server is 192.168.2.1 (I can't use 67 for some reasons). I've tried with NAT=1 and NAT=0 in ltsp.conf but doesn't work eitger. In the server, ltsp net it manual configured but the other network is DHCP
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| 12:56 | <alkisg> Hi guys
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| 12:57 | <antaresgades> gateway of server is 0.0.0.0 (set up before to 192.168.2.1 but that created a route that messed all up) From within the server I can reach 8.8.8.8 with no issues and also both the client and the other NIC
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| 12:58 | <alkisg> sfrank: are you following this page? https://ltsp.org/docs/installation/raspios/ Did you do all the steps, including the one with cmdline.txt?
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| 12:58 | antaresgades: NAT is only automated on 192.168.67.x
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| 12:58 | Otherwise, you need to run the commands for NAT manually
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| 12:59 | <alkisg> cd /usr/share/ltsp; grep -r NAT ==> will show you the commands
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| 13:00 | I.e. it's the enable_nat() function inside 55-service.sh
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| 13:01 | So essentially you want these in ltsp.conf: NAT=1; POST_SERVICE_MANUAL_NAT="iptables -s 192.168.2.0/24 -t nat -A POSTROUTING -j MASQUERADE"
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| 13:02 | Both under [server]
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| 13:04 | <antaresgades> you're too fast for me, hahahahh, currently reaching 55-service file... but I see the logic here. Better modify ltsp.conf than the source code.
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| 13:06 | By the way, and just for learn: why using precisely .67. addresses? And... commands like ltsp-update-image or better, ltps-chroot are not in current LTSP. What's the reason? (I guess there is one good one)
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| 13:08 | That works perfectly, by the way
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| 13:13 | <sfrank> alkisg yes I have followed this page scrupulously
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| 13:13 | I am at the NFS_RW stage
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| 13:14 | <robsitz> Hi guys, I would like to know how to configure image for diskless PC onto LTSP server so they can boot directly from LAN receiving my Windows RDP server logon screen. I have read documentation on ltsp.org but is too few detailed.
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| 13:40 | <mwalters> robsitz: I'm not going to be helpful with specifics, but you'll want to look at autologin for LTSP & launching a freerdp session when the autologin user is logged in
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| 13:41 | I suspect even autologin isn't very ltsp specific anymore
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| 13:43 | <robsitz> mwalters no autologin is required. I would like the diskless PCs boot and displays Windows RDP server logon screen, then user will enter username and password to login.
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| 13:43 | <mwalters> In order to launch freerdp, the workstation needs to be logged in
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| 13:44 | E.g., the client needs to fully boot linux, log into a desktop environment, and launch the remote desktop session
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| 13:45 | If you have some sort of other thin client software, I suspect you could serve that via ltsp... but I'm not sure the specifics behind that
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| 13:51 | <sfrank> sorry i was disconnected
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| 13:51 | i have lost anything ?
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| 13:52 | <robsitz> Some years ago I visited a company that had diskless PC that did boot from LAN, the company had Windows DC/DHCP server, an old LTSP server based on Ubuntu, a Windows Server RDP. When diskless PCs did boot the user was prompetd directly into Windows Server RDP. The System administrator of that company explained me that Windows DHCP server served
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| 13:52 | diskless PCs with extra DHCP options such as disk image located on the LTSP server, I think that LTSP server got an image created specifically. I have look for an howto, book etc. but I can't find anything.
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| 13:54 | <mwalters> I don't know how that company did it, but without any further information, I would: set up LTSP, configure one or more diskless PCs to autologin. Set up the autologin user to launch the remote desktop session immediately on login.
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| 13:55 | !autologin
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| 13:55 | <ltspbot> Error: "autologin" is not a valid command.
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| 13:55 | <mwalters> :(
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| 13:56 | I'm still running old ltsp, I'm not sure how that works in the new one
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| 13:56 | in anycase, the windows login would still be handled by the remote desktop session... configure windows/freerdp/remmina/etc to use the windows login screen or prompt the user some other way for credentials
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| 14:00 | <robsitz> mwalters thank you. Might the packed image in LTSP server of that company had a sort of autologin trasparent to the user so they only get Windows server RDP logon screen.
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| 14:01 | However I would like to read more, even a book, for the new LTSP but there isn't nothing.
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| 14:05 | <sfrank> alkisg my cmdline.txt is
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| 14:07 | <sfrank> "ip=dhcp root=/dev/nfs rw nfsroot=192.168.8.1:/srv/ltsp/raspios,vers=3,tcp,nolock console=serial0,115200 console=tty1 elevator=deadline fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles modprobe.blacklist=bcm2835_v4l2"
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| 14:08 | 192.168.8.1 is my dns
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| 14:10 | cmdline.txt is in /srv/ltsp/raspios/boot
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| 14:22 | D:
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| 14:33 | <alkisg> robsitz: are you able to create a linux image e.g. inside virtualbox that shows the rdp screen directly? If yes, then you can publish it to LAN via `ltsp image vm-name`
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| 14:34 | <alkisg> robsitz: the older LTSP had "screen scripts", e.g. SCREEN_08="xfreerdp params"; the new LTSP doesn't need nor automate that
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| 14:41 | <alkisg> sfrank: don't put your dns there, put your ltsp server ip
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| 14:42 | <sfrank> ok i try
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| 14:48 | <alkisg> robsitz: so a rough guideline is: install ubuntu-server; apt install xorg xfreerd over it; create a user and have it autologin using any dm (or lightdm that ltsp configures automatically); and use your own session that runs xfreerdp in a loop.
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| 14:48 | robsitz: you can also skip autologin and manually run xorg + your session as root, but it's not easier AND it's a security issue to run things as root when you don't need them to
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| 14:49 | (of course ubuntu-server is just an example, you can also use debian or whatever else)
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| 14:51 | <robsitz> Thanks alkisg
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| 14:51 | <alkisg> np
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| 14:52 | You can also use a full desktop image like ubuntu mate, and you only lose some disk space; you don't lose any RAM etc
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| 14:53 | <sfrank> alkisg thank you
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| 16:07 | <douglas_br> hello!
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| 16:09 | I have other ltsp machine that the client shows this: https://imgur.com/KNDWBez
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| 16:11 | I follow the official doc. The ltsp has one lan card
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| 16:11 | and other client loads until 79% and stop
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| 16:12 | <alkisg> douglas_br: does any client load fully?
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| 16:12 | <douglas_br> no, not
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| 16:13 | <alkisg> douglas_br: can you try this command on the server? sudo wget boot.ipxe.org/ipxe.pxe -O /srv/tftp/ltsp/undionly.kpxe
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| 16:13 | Then reboot the clients
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| 16:14 | <douglas_br> right, I will to try thanks
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| 16:26 | <douglas_br> alkisg not possible resolve address machine "boot.ipxe.org"
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| 16:43 | <alkisg> douglas_br: you don't have internet on your server?
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| 16:44 | <douglas_br> Internet is ok
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| 16:44 | ohhh not
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| 16:44 | wait
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| 17:13 | after your command, does not work: https://imgur.com/hlHAdM7
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| 17:14 | <alkisg> douglas_br: I can't see the client screen in that screenshot
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| 17:14 | <douglas_br> wait
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| 17:17 | client https://imgur.com/WD4kOYp
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| 17:32 | <alkisg> douglas_br: what's the output of this command now? md5sum /srv/tftp/ltsp/undionly.kpxe
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| 17:33 | Also, did you change anything else? Because your client doesn't even get a dhcp offer now
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| 17:34 | As the next step, can you try to boot that client with ipxe.iso or ipxe.dsk or ipxe.usb, i.e. from a local ipxe?
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| 17:37 | <douglas_2_br> md5sum /srv/tftp/ltsp/undionly.kpxe
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| 17:37 | b03de15c553aa1f9be5df0e6a5a75c0b /srv/tftp/ltsp/undionly.kpxe
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| 17:38 | <douglas_2_br> now I am on server
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| 17:42 | <douglas_2_br> alkisg first I did the command that you tell me. so client does not work, so, I restart server try again, and the last follow the official docs again
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| 17:45 | <douglas_br> How can I do this? As the next step, can you try to boot that client with ipxe.iso or ipxe.dsk or ipxe.usb, i.e. from a local ipxe?.
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| 17:47 | <alkisg> To put ipxe in a cd or a usb stick etc
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| 17:52 | <douglas_2_br> from undionly.kpxe ?
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| 17:53 | yes I can try boot from pendrive or cd but, about what iso?
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| 17:55 | <alkisg> Go to boot.ipxe.org
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| 17:55 | There are many ipxe files there
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| 17:56 | Choose the one you want. E.g. ipxe.usb
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| 17:56 | Write it in a usb stick, and boot with that one
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| 17:56 | <douglas_2_br> right
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| 17:57 | thanks
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| 18:43 | <douglas_2_br> @alkis here the usb boot ipxe: https://imgur.com/egoQzy1
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| 18:44 | and here screen 2: https://imgur.com/a/1wXCWg8
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| 18:46 | <alkisg> douglas_2_br: try to boot a VM or some other pc with a different network card
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| 18:46 | To make sure first that your setup is fine; and then you can troubleshoot the ipxe part
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| 18:48 | <douglas_2_br> @alkis we have some clients pcs to use, I did try with 3 differents clients but I can get other to test it
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| 18:53 | the server is a new, not in production. I think that can do new machine again
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| 18:53 | the distro is xubuntu 20.04 lts
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| 19:06 | <alkisg> douglas_2_br: can I have a quick look at the server?
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| 19:06 | !vnc-edide
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| 19:06 | <ltspbot> 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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| 19:09 | <alkisg> In all the screenshots, you have rtl8136, the same nic
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| 19:15 | douglas_2_br: the problem is that you have a weird network setup
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| 19:15 | You are trying to do a two-nic setup with one nic
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| 19:15 | Why do you have 2 IPs there? 10.x and 192.168.67.1?
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| 19:16 | If you have an external dhcp server, use it
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| 19:16 | If not, make the ltsp server a dhcp server in 10.x
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| 19:16 | Don't use dual IP
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| 19:16 | <douglas_2_br> 1 connection came from pfsense
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| 19:16 | 10.1
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| 19:16 | <alkisg> pfsense has dhcp enabled?
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| 19:16 | <douglas_2_br> not
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| 19:16 | <alkisg> Then who gives IPs ?
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| 19:16 | <douglas_2_br> no dhcp
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| 19:16 | <alkisg> OK
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| 19:16 | Then you need to set ltsp to give IPs
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| 19:16 | In10.x
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| 19:16 | In the 10.x subnet
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| 19:16 | Anyway, does it work now?
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| 19:17 | Did the client boot?
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| 19:17 | <douglas_2_br> yesss
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| 19:17 | <alkisg> OK
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| 19:17 | If you want to use 2 IPs, do NOT use proxydhcp
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| 19:17 | So, `ltsp dnsmasq --proxy=0`
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| 19:17 | If you want to use one IP, change dnsmasq to send IPs in 10.x
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| 19:17 | <douglas_2_br> thanks and sorry
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| 19:17 | <alkisg> No worries, cheers, closing vnc
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| 19:19 | <douglas_2_br> If you want to use one IP, change dnsmasq to send IPs in 10.x ----- but on school I do not change
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| 19:20 | "ltsp dnsmasq --proxy=0` ohhh right
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