IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 5 January 2022 (all times are UTC)
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| 08:45 | <alkisg> vagrantc: I'll prepare ltsp 22.01 and epoptes 22.01 in the following days, do you have any spare time to upload them to debian? (no rush, we have till the end of february for ubuntu freeze)
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| 09:52 | <parlos> alkisg; got a question wrt. the install. Got some time?
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| 09:52 | <alkisg> parlos: sure, shoot
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| 09:54 | <parlos> I've arrived at 'ltsp dnsmasq' and I've got (test case ) two nics, one external (private IP), and another that will be used for PXE stuff.
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| 09:55 | <alkisg> That use case is automatic if you use server IP=192.168.67.1 for the internal subnet
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| 09:55 | <parlos> In my future environment, I'll have multiple NICs that will need to serve PXE.
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| 09:55 | <alkisg> We special case that subnet to mean "internal PXE/LTSP subnet where LTSP is supposed to be a DHCP server"
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| 09:55 | <parlos> That 's fine, expected.
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| 09:56 | But it needs to server multiple NICs, and I need to control the IP ranges.
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| 09:56 | <alkisg> Unfortunately we don't special case "multiple PXE subnets", so you'll need to add a couple of lines yourself to /etc/dnsmasq.d/local.conf
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| 09:56 | And you'll also need to do NAT forwarding yourself (one line in ltsp.conf) for those extra subnets
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| 09:57 | <parlos> Ok, is dnsmasq doing the DHCP?
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| 09:57 | <alkisg> LTSP uses this, you can put something similar in local.conf: dhcp-range=192.168.67.20,192.168.67.250,12h
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| 09:57 | Yes
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| 09:58 | <parlos> Alright, so --proxy-dhcp=0 that isnt specifying a NIC to server DHCP requests on?
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| 09:58 | That I have to change manually later.
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| 09:59 | <alkisg> By default, you'll be able to netboot clients from the non-LTSP NIC, using the proxydhcp protocol
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| 09:59 | So by running `ltsp dnsmasq -p=0` you'll avoid that
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| 09:59 | There's no need to restrict to interfaces if the IPs are set correctly, dnsmasq can see which interface to use based on the interface IP
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| 10:02 | <parlos> Looking into /etc/dnsmasq.d/ltsp-dnsmasq.conf that the file you referenced before?
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| 10:03 | <alkisg> That's the one that should be managed by ltsp dnsmasq
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| 10:03 | While for additional content, use another one at /etc/dnsmasq.d/local.conf
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| 10:05 | <parlos> But I can change the ltsp-dnsmasq.conf to my need? there isnt anything that will overwrite it?
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| 10:06 | <alkisg> If you never run `ltsp dnsmasq` yourself, then nothing will overwrite it
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| 10:06 | But if you can use the "separate local.conf" logic, you should, to allow ltsp to create better ltsp-dnsmasq.conf in the future
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| 10:06 | <parlos> ok, and that you only run during install.... Does the install read a config file? Perhaps better to place info in that.
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| 10:07 | <alkisg> For example, when UEFI support was added, or when rpi4 support was added, that separation helped
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| 10:07 | `ltsp dnsmasq` is never ran automatically, only the sysadmin runs it
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| 10:08 | <parlos> Ok, with two config files. How is precedence handled? And the local.conf file, is that just a copy of the ltsp file, but with my settings?
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| 10:09 | <alkisg> Not a copy; you'd only put the extra content there, e.g. only this line for 3 NICs:
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| 10:09 | dhcp-range=192.168.68.20,192.168.68.250,12h
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| 10:09 | That would add a new 68 subnet in addition to the stock 67 one that ltsp uses
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| 10:10 | dnsmasq reads all the files in the dnsmasq.d and combines them to create the resulting configuration; there shouldn't be any conflicting content
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| 10:11 | <parlos> Ok, so its default config + EXTRA, but no replace/remove.
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| 10:11 | <alkisg> If at some point you see that ltsp-dnsmasq.conf conflicts with what you want, then you'll need to manage it yourself from that point on
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| 10:11 | Right
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| 10:11 | (in a few cases, later content overrides previous content; that's documented in the dnsmasq man page)
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| 10:14 | <parlos> might be good if the 'ltsp dnsmasq <--proxy-dhcp=0>' either read a config file, or accepted some additional input, for example to get the IP range. Thanks for your answer and clarification.
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| 10:15 | <alkisg> You can add PROXY_DHCP=0 under [server] in /etc/ltsp/ltsp.conf
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| 10:15 | So that you don't forget to add -p=0 in the future, and it's added automatically instead
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| 10:15 | proxy_dhcp=0 means "disable" so it doesn't make sense to add a range for that
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| 10:15 | <parlos> Is that file /etc/ltsp/ltsp.conf created automatically?
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| 10:16 | I got a folder /etc/ltsp but no files in side.
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| 10:16 | <alkisg> No, see https://ltsp.org/man/ltsp.conf/ for instructions on how to initially create it
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| 10:16 | By default no configuration is needed
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| 10:16 | So that's an "administrative" action
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| 10:16 | <parlos> ok, thanks, working my way through the installation doc.
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| 10:17 | <alkisg> 👍️
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| 10:28 | <parlos> Im back, now a question wrt. images. For example, I need to launch the network installer for Ubuntu X.Y. Previously, I just served a installer kernel and its ramdisk. Isnt that possible?
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| 10:52 | <alkisg> parlos: sure, you just need to add an ipxe entry for your non-ltsp tasks
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| 10:52 | See an example at https://github.com/ltsp/ltsp/wiki/Non-LTSP-iPXE-entries
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| 10:58 | <parlos> :thumbsup:
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| 11:24 | <parlos> I've added one of those; did the ltsp ipxe, nfs and initrd. Fixed a error in the dnsmasq.d/local.conf, restarted dnsmasq.
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| 11:25 | the host is served a PXE image, but it complains 'TXE: 1 x "Nework unreachable ..."'
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| 11:26 | <alkisg> Can you upload a photo?
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| 11:26 | (from the client screen)
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| 11:27 | Btw, did you boot a client with ltsp before that try, or that's the first try, a custom one?
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| 11:28 | <parlos> At this time I was just hoping for the PXE menu, I've not added any ltsp clients.
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| 11:28 | so a custom
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| 11:28 | <alkisg> OK upload a photo so that we see at which point it stopped
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| 11:28 | You didn't see the blue ipxe menu at all?
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| 11:28 | <parlos> where would you recommend that I upload the photo, used to pastebin for text.. no
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| 11:28 | where would you recommend that I upload the photo, used to pastebin for text..
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| 11:29 | <alkisg> !photo
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| 11:29 | <ltspbot> I do not know about 'photo', but I do know about these similar topics: 'paste'
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| 11:29 | <alkisg> Hmmm, anyway, imgur.com can be used, but it's best if you just join matrix instead of irc
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| 11:29 | There you can just drag and drop the photo...
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| 11:30 | https://ltsp.org/advanced/chat-room/
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| 11:32 | * PatrikArlos[m] uploaded an image: (147KiB) < https://libera.ems.host/_matrix/media/r0/download/matrix.org/LPggdFFIrIgbDgYGiUpvZKzU/Screenshot_20220105_122645.png > | |
| 11:32 | <parlos> Image uploaded.
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| 11:32 | No blue ipxe menu was showed.
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| 11:44 | * parlos getting some food | |
| 11:44 | <alkisg> Use bridged networking not nat
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| 11:44 | Me too (food) ;)
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| 12:02 | <parlos> Dont think bridge/nat would impact. I looked with wireshark, and saw the messages being exchanged....
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| 12:04 | <alkisg> In nat, vbox does the pxe itself
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| 12:04 | Ltsp wont work there
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| 12:39 | <alkisg> For VirtualBox clients, I'm booting them with http://boot.ipxe.org/ipxe.iso, because I saw that the internal ipxe that vbox includes in its ROM is a stripped down unstable version
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| 12:40 | To get PXE clients booted under NAT in VirtualBox, you need to provide a custom TFTP dir. LTSP can work that way, but it'll miss a few things as it's behind NAT.
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| 12:40 | It's much saner to use bridged networking
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| 13:01 | <parlos> Bummer, standard isc-dhcp-server + tftp works fine for both physical and virtual boxed.
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| 13:01 | Bummer, standard isc-dhcp-server + tftp works fine for both physical and virtual machines.
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| 13:10 | I've ran my 'std' and it works, with the same VM (from experience it operates on physical machines too).
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| 13:11 | When the ltsp PXE was used, the client(host) ask for an IP, and the server replies with an OFFER, but the client never accepts, just keeps on asking.
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| 13:28 | <alkisg> If you have isc dhcp +tftp working, then dnsmasq + ipxe will also work
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| 13:29 | The problem then may be in the borked intenal ipxe; try with ipxe.iso
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| 13:29 | Back in a couple of hours
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| 13:29 | Btw ltsp also supports isc dhcp, although you don't need it, dnsmasq is fine
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| 13:34 | <MUHWALT> Hey alkisg, happy new year. Asked this yesterday, but think you weren't here:
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| 13:35 | Is the addition of temporary users "ltsp_temporary_user_####" normal in ltsp5? I installed a HIDS agent on my LTSP servers and just got an alert because of, what I assume, is someone mistyping their password a few times, succeeding, and there being the temporary user added soon after
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| 14:56 | <alkisg> MUHWALT: happy new year; ltsp5 isn't supported anymore. That said, ltsp never automatically added any users on the servers, and I've never seen any ltsp_temporary_user_### references at all
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| 14:56 | <MUHWALT> understood; well that's fun, then!
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| 14:57 | Thanks, I guess I need to dig into what that was then
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| 14:57 | <alkisg> These are probably not originating from ltsp (unless it was something from the proprietary cluster stuff ages ago, I've never saw that code...)
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| 14:57 | <MUHWALT> lol
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| 14:58 | <alkisg> parlos: did you try with boot.ipxe.org/ipxe.iso? Did it solve the boot issues?
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| 14:59 | <MUHWALT> oh, it originated on one of the fat clients; reported from server because the clients log back there
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| 14:59 | (with rsyslog)
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| 15:00 | <alkisg> MUHWALT: hmm, btw your message from yesterday does appear on https://irclogs.ltsp.org/?d=2022-01-04 but not on matrix; I guess matrix lagged at some point... it's best to use Matrix rather than the old IRC channel when possible
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| 15:00 | https://ltsp.org/advanced/chat-room/
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| 15:00 | <MUHWALT> aw, but I *finally* have weechat *just* the way I want it!!! ;)
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| 15:01 | <alkisg> Hehe
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| 15:01 | MUHWALT: indeed that message is from ltsp then
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| 15:02 | <MUHWALT> yeah, shows useradd with the ltsp_temporary_user_####, with home of the user that logged in
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| 15:02 | <alkisg> From client/localapps/ldm-rc.d/X01-localapps
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| 15:02 | <MUHWALT> only alerted because she failed to log in a bunch of times
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| 15:02 | thanks for confirming :D
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| 15:03 | <alkisg> 👍️
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| 15:03 | <MUHWALT> We had our freepbx instance hacked just after xmas, so we're in hyper alert mode 🤣
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| 15:03 | <parlos> alkisg: just downloaded it, mounted and ran ltsp kernel ipxe.. Complains "Could not locate vmlinuz and initrd.img in ipxe"...
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| 15:04 | <alkisg> Was it as ancient version as ltsp5? :D
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| 15:06 | <MUHWALT> lol, no! Just FreePBX/Sangoma's *wonderful* development practices that regressed on an RCE exploit
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| 15:06 | <alkisg> parlos: you put ipxe.iso in the virtualbox settings; you don't use it as an ltsp image
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| 15:06 | E.g. click on vmclient01, properties, boot from => ipxe.iso
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| 15:06 | Instead of boot from => LAN
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| 15:07 | <parlos> If I can boot a VM from that iso, what will that show?
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| 15:07 | * alkisg is using virtualbox for testing ltsp and netbooting as well, it works fine except for the "internal broken ipxe rom" part | |
| 15:09 | <alkisg> parlos: it will show "loading ipxe... booting from lan... blue ipxe menu... loading kernel / initrd ... installing ubuntu etc"
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| 15:10 | What were you using before, pxelinux?
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| 15:10 | <parlos> yup, some old ubuntu 14 it seems.
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| 15:11 | <alkisg> pxelinux was about 5% more compatible with silly ROMs than ipxe, but it doesn't support uefi, so we moved away from it
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| 15:11 | <parlos> Ok, so I got the blue boot menu now..
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| 15:11 | <alkisg> OK
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| 15:12 | <parlos> So, the pxe boot image thats on the ipxe.iso how its that different from the one that ltsp comes with?
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| 15:12 | <alkisg> Not ltsp. virtualbox.
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| 15:13 | Virtualbox itself has a broken ipxe version for netbooting.
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| 15:13 | The ipxe developers warn against using it
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| 15:13 | If you use a real client, it'll work
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| 15:14 | <parlos> Bummer to test then.
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| 15:14 | <alkisg> Why? You just use "boot from iso" instead of "boot from lan"
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| 15:14 | I've been doing that for ...10 years? now
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| 15:15 | An alternative is to install the vbox extensions and use the intel netbooting code, instead of the broken old ipxe code
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| 15:16 | I think it's also been reported to the vbox developers, but they have space issues or something and can't use a proper ipxe, and they keep using the broken one
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| 15:16 | <parlos> OK, sad though as the old workded for both physical, virtual (KVM/Vbox).
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| 15:17 | <alkisg> KVM also works fine
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| 15:17 | This is a bug in virtualbox, not in ltsp
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| 15:17 | <parlos> But I added a 'iso' without LTSP mode. SHould that now show up in the menu?
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| 15:17 | <alkisg> Yes, if you added it to the menu, it should show up in the menu
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| 15:17 | <parlos> Followed https://github.com/ltsp/ltsp/wiki/Non-LTSP-iPXE-entries
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| 15:18 | <alkisg> Open /srv/tftp/ltsp/ltsp.ipxe and see if it's there
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| 15:19 | <parlos> Its there Added it att the bottom..
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| 16:01 | <PatrikArlos[m]> Got Ubuntu18 Installer to boot.. :)
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| 16:02 | <parlos> Alright, time to have a break. Thanks for your patience and help.
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| 16:03 | Have a nice day!
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| 19:34 | <sunweaver> alkisg: vagrantc: good evning, good morning/day.
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| 19:35 | here is one more ltsp.img question for you.
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| 19:35 | * alkisg waves to sunweaver | |
| 19:35 | <sunweaver> You remember my concerns about creating ltsp.img on the host for some use cases.
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| 19:35 | <alkisg> You mean in the image/chroot?
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| 19:35 | <sunweaver> In fact, I now faced the problem that ltsp initrd copies the host's /etc/passwd and /etc/group into the ltsp.img.
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| 19:36 | <alkisg> Yes, that's the desired result, because they're supposed to login to the ltsp server
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| 19:36 | <sunweaver> the system itself is a squashfs image (or nfsroot) created from a chroot.
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| 19:36 | <alkisg> It can be easily avoided by placing custom things in /etc/ltsp/passwd
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| 19:37 | <sunweaver> My problem is that the chroot's /etc/passwd (and the file permissions in the chroot is very different from the LTSP server's passwd and group file.
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| 19:37 | the chroot has many more system users... e.g. bluetooth and such.
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| 19:37 | the /etc/{passwd,group} of the server host however is rather minimal.
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| 19:37 | <alkisg> The system groups of the CHROOT are used
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| 19:37 | They are automatically merged at ltsp init
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| 19:37 | <sunweaver> more portions of the code, I haven't read, yet.
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| 19:38 | <alkisg> (back in half an hour)
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| 19:38 | <sunweaver> so ltsp.img has the host's passwd and group, but only parts of those are used?
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| 19:38 | (ok)
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| 20:00 | <alkisg> yes only the parts > 1000 (or whatever's defined in /etc/login.defs)
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| 20:11 | * vagrantc waves | |
| 20:11 | <vagrantc> happy new year, fellow LTSP folks!
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| 20:18 | <alkisg> Happy new year vagrantc! Will you have any free time to upload ltsp/epoptes? I'm planning to release new versions next week...
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| 20:46 | <vagrantc> sure, would be good to get the debian/watch files fixed ... i think you had already committed fixes upstream but after the last uploads
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| 20:49 | <sunweaver> alkisg: I figured things out now. Now I really can use my host's ltsp.conf and ltsp initrd command.
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| 20:49 | Very awesome.
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| 20:49 | btw. our diskless workstations now also use Kerberos and NFSv4+krb5i
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| 20:50 | <vagrantc> despite having been heavily involved with ltsp5 for many years, i really find the new style stuff to be much easier to work with overall ... not that i still am maintaining any actual networks right now :)
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| 20:50 | kerberos, fancy!
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| 20:51 | sunweaver: for the rootfs and/or home dirs?
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| 20:51 | does that mean the traffic between client and server is encrypted?
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| 20:51 | <sunweaver> vagrantc: homedirs.
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| 20:51 | <vagrantc> or just authenticated?
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| 20:51 | <sunweaver> krb5i means authenticated.
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| 20:52 | * vagrantc vaguely recalls kerberos with nfsv4 allowing for encrypted connections ... | |
| 20:52 | <vagrantc> but it's been ages since i even glanced at it
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| 20:52 | <sunweaver> But krb5p (private -> encrypted) is possible, too. But I don't want to risk all that crypto on a school network to break the server CPUs).
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| 20:52 | <vagrantc> heh
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| 22:06 | <sfxworks[m]> Trying to install ltsp on a raspberry pi cm4 on raspbian, it can't find ltsp-binaries
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| 22:07 | `E: Package 'ltsp-binaries' has no installation candidate`
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| 22:39 | <vagrantc> did you add the ppa?
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