IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 25 February 2019 (all times are UTC)
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| 10:09 | <uumas> I'm setting up a new ltsp server and got it booting clients, but the clients don't get their hostnames from my dhcp server, but just use the generic ltspXX hostnames. I know the issue isn't with the dhcp server, because clients booted from another ltsp server get their hostnames just fine
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| 10:13 | <alkisg> !ipappend
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| 10:13 | <ltsp> ipappend: o temporarily solve DHCP problems in the initramfs, try putting IPAPPEND 3 after the APPEND line in /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default. More info: http://www.syslinux.org/wiki/index.php/SYSLINUX#IPAPPEND_flag_val_.5BPXELINUX_only.5D
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| 10:13 | <alkisg> uumas: ltsp started defaulting to ipappend 3
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| 10:13 | This makes the clients skip the second dhcp request that gets the hostname etc
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| 10:14 | So you need to revert back to ipappend 2
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| 10:14 | (or, set the hostnames in lts.conf instead of in dhcp)
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| 10:15 | <uumas> Ok, thanks. Why was that change made?
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| 10:15 | <alkisg> It's needed for proxydhcp, which is the default and most common case nowadays
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| 10:15 | Otherwise proxydhcp setups don't work
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| 10:16 | (the ltsp clients don't know how to contact proxydhcp servers unless ipappend 3 passes a hardcoded ip in the kernel cmdline)
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| 10:18 | <uumas> It seems I need to edit /etc/ltsp/update-kernels.conf right?
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| 10:18 | <alkisg> chrootless or with chroot?
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| 10:19 | <uumas> Without
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| 10:19 | <alkisg> Then yes you edit /etc/ltsp/update-kernels.conf, and then you run ltsp-update-image -c /
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| 10:20 | Sorry
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| 10:20 | <uumas> Great, thank you!
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| 10:20 | <alkisg> you edit /etc/ltsp/update-kernels.conf, you run /usr/share/ltsp/update-kernels, and then you run ltsp-update-image -c /
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| 10:20 | uumas: ^
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| 10:20 | 3 steps involved
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| 10:20 | <uumas> Ok
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| 10:20 | <alkisg> The pxe setup was trying to be too clever, and it ended up being hard to use
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| 10:21 | In the new one it'll just be a user editable file :D
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| 10:22 | <uumas> What's the difference between running /usr/share/ltsp/update-kernels and ltsp-update-kernels
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| 10:23 | <alkisg> One is run in the chroot, the other on the server
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| 10:23 | It's complicated :)
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| 10:24 | * alkisg explained it in the ltsp-discuss mailing list a few times, but got tired for too many repeats :D | |
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| 11:56 | <uumas> After changing the ipappend setting and updating kernels and image, it starts booting, shows ip-config: ens3 complete with the correct hostname, but drops into a initramfs shell saying: Failure: Insufficient information setting up nbd, quitting (nbdroot=, hostname=<correct ltsp server ip>, name=, port=, nbd-device=/dev/nbd0)
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| 12:16 | <Faith> uumas, what is on your dhcpd.conf?
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| 12:19 | <uumas> It doesn't exist
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| 12:20 | in /etc/ltsp/ at least
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| 12:21 | <Faith> are you using dnsmasq ou isc dhcp?
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| 12:21 | or*
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| 12:21 | <uumas> I'm using isc-dhcp on a separate dhcp server
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| 12:23 | <Faith> you have to put the image information on the dhcpd.conf, on your dhcp server
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| 12:24 | <uumas> I have filename and next-server set
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| 12:25 | The same setup works for the old ltsp server
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| 12:25 | <Faith> you have to use option root-path too
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| 12:25 | like:
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| 12:25 | filename "/ltsp/chrootname-amd64/pxelinux.0";
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| 12:25 | option root-path "/opt/ltsp/chrootname-amd64";
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| 12:25 | filename is the path from tftp
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| 12:26 | and option root-path is the path for the image
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| 12:28 | <uumas> I have chrootless setup so do I just set root-path "/"
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| 12:32 | <Faith> alkisg, is it possible to use nbd with chrootless?
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| 12:54 | <uumas> It boots fine with ipappend=3, but doesn't get hostname (or it seems dns) from dhcp. The clients are also able to boot from the old ltsp server, which has ipappend=2, has a chroot and has no option root-path setting either.
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| 13:03 | <Faith> uumas, I got it wrong, I thought it's not booting. Well, if the problem is the hostname, it's not to do with nbd options...
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| 13:35 | <uumas> With ipappend=3 it doesn't get the hostname from DHCP but boots fine
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| 13:35 | With ipappend=2 it gets the hostname but doesn't boot
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| 14:04 | <alkisg> (02:32:03 PM) Faith: alkisg, is it possible to use nbd with chrootless? => yes, nbd is actually the only current choice with chrootless
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| 14:08 | <Faith> really? I thought it was nfs, cause you need to build an image to use nbd, so I imagined people use chrootless to make changes on server and it's already on clients...
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| 14:08 | I always used chroot with nbd, never try chrootless...
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| 14:10 | <alkisg> Faith: ltsp-update-image -c /, takes a snapshot of the server, cleans it up from sensitive information, and exports it via nbd
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| 14:23 | <Faith> alkisg, it makes sense, case if you use nfs you will export all the system with the sensitive informations...
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| 16:54 | <alkisg> uumas: ok with ipappend?
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| 16:58 | <uumas> No luck, still getting the same error as earlier
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| 16:58 | Failure: Insufficient information setting up nbd, quitting (nbdroot=, hostname=<correct ltsp server ip>, name=, port=, nbd-device=/dev/nbd0)
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| 16:58 | And then it drops me into an initramfs shell
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| 17:06 | <uumas> I'm kind of stuck with this now, because I can't find the difference between the old server's configs and the new ones that makes the difference
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| 17:14 | <alkisg> uumas: what's the output of this, on the client?
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| 17:14 | ipconfig -n enp2s0
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| 17:14 | Actually run this on the server:
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| 17:14 | /usr/lib/klibc/bin/ipconfig -n enp2s0 | nc termbin.com 9999
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| 17:14 | And paste the output
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| 17:15 | So that we see if your server is configured properly
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| 17:15 | *dhcp server
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| 17:18 | <uumas> Here you go: https://pastebin.com/SK3nk1Yc
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| 17:19 | I changed the interface name to be correct and snipped a few possibly sensitive details
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| 17:31 | Here's the same run on a client: https://pastebin.com/T4JfjMiD
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| 17:33 | The client was booted from the old ltsp server and that's why it's eth0 rather than the new format
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| 17:41 | <alkisg> uumas: so your dhcp server doesn't return the filename
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| 17:41 | fix your dhcp server
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| 17:53 | <uumas> It does, just not for the server (and it isn't supposed to). Look at the paste from the client
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| 17:53 | <alkisg> uumas: it doesn't return a rootpath on the client
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| 17:53 | So the client doesn't know where to mount nbd from
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| 17:54 | Send rootpath=/opt/ltsp/amd64 there
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| 17:54 | <uumas> That path doesn't exist, because it's chrootless
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| 17:54 | <alkisg> It refers to the nbd mount
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| 17:54 | It's the header of /etc/nbd-server/conf.d/ltsp_amd64.conf
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| 17:59 | !nbd-client
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| 17:59 | <ltsp> nbd-client: To try mounting the NBD image from the client initramfs: nbd-client 192.168.67.1 -N /opt/ltsp/i386 /dev/nbd0
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| 17:59 | <alkisg> So, the client needs it to run that ^ command at that point where it breaks for you
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| 18:00 | <uumas> Hmm, I'll try that. Any idea why it's working for the older ltsp server without needing that?
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| 18:01 | <alkisg> There's been a change to prefer BOOT_IMAGE from the client cmdline
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| 18:01 | If you paste the output of `cat /proc/cmdline` from old/new client, I'll be able to tell you exactly
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| 18:02 | (otherwise, it falls back to /opt/ltsp/<ARCH>, so the fallback was on effect on the old server)
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| 18:12 | <uumas> Success! (I think). The test machine (a kvm virtual machine) still doesn't manage to boot on the new server, but starts throwing squashfs errors before it completes boot, but that happened earlier also, so I'll have to test tomorrow when I have access to the physical clients to make sure.
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| 18:17 | I can't get the new /proc/cmdline now, but this is what it's based on right: https://pastebin.com/aJYdPbyL
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| 18:25 | <alkisg> Yeah it doesn't have a path there, so it's justified
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| 19:29 | <alkisg> "liveclone", how does that sound for a new name? :P :D
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| 19:31 | ...or, "twinboot"?
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| 19:31 | I don't think there are *any* 4 letter project names left unclaimed in github...
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| 19:47 | <vagrantc> context?
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| 20:54 | <white-wizard> hi
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| 20:54 | i would like install an ltsp server en thin client over the adsl connexion... it's possible ?
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| 20:54 | and*
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| 20:55 | s/en/and
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| 20:55 | for my mother and me
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| 21:00 | <mwalters> white-wizard: you're probably better off just using x2go/rdp
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| 21:01 | let me rephrase, you're definitely better off just using x2go/rdp ;)
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| 21:07 | <alkisg> You can install over adsl, you cannot use ltsp over adsl:D
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| 21:08 | <white-wizard> ok
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