IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 28 December 2020 (all times are UTC)
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| 11:08 | <bobby82> Hi
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| 11:08 | I cannot create an image. the command "debootstrap focal focal" fails.
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| 11:38 | <alkisg> bobby82: can you pastebin the whole debian output?
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| 11:38 | *terminal
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| 11:38 | !paste
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| 11:38 | <ltspbot`> paste: To avoid channel flooding, please upload text longer than 3 lines to http://paste.debian.net. Don't forget to paste the resulting URL here.
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| 11:39 | <alkisg> Also, are you sure you want a "chroot" image, instead of "chrootless" or "vm image", which are easier?
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| 11:40 | <bobby82> as far as I understood the wiki, the chrootless images use the server files so they have the same architecture
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| 11:40 | correct me if I'm wrong
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| 11:41 | <alkisg> Indeed. What's your use case, what do you need?
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| 11:41 | <bobby82> I have a 64bit desktop that is supposed to serve images for non-64bit diskless laptops
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| 11:42 | <alkisg> You mean 32bit x86 clients? Focal doesn't support 32bit
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| 11:42 | The last Ubuntu to support 32bit was 18.04, "bionic"
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| 11:42 | <bobby82> Indeed
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| 11:42 | <alkisg> Debian still supports 32bit
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| 11:42 | So, a "focal" chroot wouldn't work for you anyway
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| 11:42 | What's your ltsp server distribution? Focal 64bit?
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| 11:43 | <bobby82> yes
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| 11:43 | <alkisg> Is it a desktop machine? Does it run xorg?
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| 11:43 | <bobby82> Yes
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| 11:43 | <alkisg> And I assume your clients will also need a desktop, right?
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| 11:43 | <bobby82> Sure
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| 11:43 | <alkisg> The easiest way would be to do a 32bit os installation inside virtualbox
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| 11:44 | E.g. Ubuntu MATE 18.04 32bit or whatever else you like
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| 11:44 | Read this: https://ltsp.org/man/ltsp-image/#vm-images
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| 11:44 | (btw, about your initial issue, I just ran `debootstrap focal focal`, and it finished successfully, no problems there)
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| 11:45 | <bobby82> if you add --archi386, it fails
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| 11:45 | <alkisg> Because there's no i386 architecture in focal, of course
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| 11:45 | This is a user problem, not a distribution problem...
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| 11:45 | You would need "bionic" there, not "focal"
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| 11:46 | <bobby82> Well, in that case it should say it can't run and not leave me with a half installed base system and a message about missing dependencies
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| 11:46 | <alkisg> Sure if you want you can report it to Ubuntu; debootstrap isn't related to ltsp at all
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| 11:47 | <bobby82> so is it a good idea to go with a Bionic ltsp image and access an account which is used from a Focal installation most of the time?
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| 11:48 | <alkisg> Specifically for these two, it shouldn't be a problem; in other cases, e.g. thunderbird or firefox may upgrade their ~/.local folders to newer formats, in which case they won't be loaded from the previous version anymore
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| 11:48 | In that case, you'd need to downgrade the problematic app so that it works with the previous settings/data folder
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| 11:49 | Also, I've tested that scenario with MATE; I don't know about other desktop environments (with mixed versions, that is)
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| 11:49 | <bobby82> That's what concerns me most... different Plasma versions...
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| 11:49 | <alkisg> You can install the server with 18.04/64bit, and the vm with 18.04/32bit
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| 11:50 | Or you can use any recent Debian instead of Ubuntu
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| 11:50 | In general it's rarely a problem though; I've been booting lots and lots of live CDs of various years and desktop environments with the same home, and I haven't noticed such issues except for certain thunderbird/firefox versions
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| 11:51 | debootstrap --arch=i386 bionic bionic ==> this also just finished successfully
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| 11:52 | <bobby82> I have one i386 client and one client that is amd64 (which is the more important one). I think I will go without the i386 one...
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| 11:53 | <alkisg> If your server is good enough, you could also boot the i386 client with any distro/version, and then use x2go or xfreerdp to connect to the server 20.04/KDE and run the same set of apps
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| 11:53 | I.e. thin client instead of fat
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| 11:54 | <bobby82> That would be my preferred way to do it
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| 11:54 | Is that possible on a diskless machine?
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| 11:54 | <alkisg> Sure. Start with that Ubuntu 18.04/32/KDE VM that I said, and you can add xfreerdp on top of that
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| 11:55 | <bobby82> But in that case I would have to send different images to corresponding machines. How would I do that?
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| 11:56 | <alkisg> If you name the images x86_64 and x86_32, then the 32bit clients choose the correct one automatically
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| 11:56 | <bobby82> Really?
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| 11:56 | <alkisg> Yup
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| 12:00 | <bobby82> Doesnt't the dhcp contain the exact image file name?
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| 12:00 | <alkisg> LTSP uses ipxe as the "image file name"; then ipxe loads a script, and we have code inside the "ltsp.ipxe" script that does the autodetection
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| 12:01 | https://github.com/ltsp/ltsp/blob/master/ltsp/server/ipxe/ltsp.ipxe#L10
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| 12:01 | cpuid --ext 29 && set img x86_64 || set img x86_32
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| 12:02 | <bobby82> it detects the type of a remote CPU?
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| 12:02 | <alkisg> ipxe runs on the client, not on the server
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| 12:02 | It gets downloaded from the server, but it runs on the client
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| 12:03 | <bobby82> Okay. I wanted to set this up during the days of LTSP5, but I had no idea how to do this...
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| 12:04 | <alkisg> At that time we were using syslinux, and you could implement that with the "ifcpu64" module
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| 12:04 | But ipxe is so much more powerful, that in ltsp20 I added scripting support for various things, e.g. kernel parameters, default image, menus, timeout...
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| 12:04 | Now you can put a kernel parameter inside ltsp.conf, and have it reach the client /proc/cmdline
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| 12:05 | <bobby82> Okay. Thanks for your support. I will consider my options...
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| 12:05 | <alkisg> np
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| 12:05 | <bobby82> Great piece of software, btw
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| 12:06 | <alkisg> Thank you
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| 12:33 | <bobby20> Okay, the client reaches the server. But I ran into another problem.
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| 12:33 | "sudo ltsp image /" doesn't work
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| 12:35 | https://pastebin.com/fnBLUfPb
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| 14:11 | <bobby20> Anyone?
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| 14:30 | Okay, solved it
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| 14:53 | <bobby85> Anyone here?
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| 15:06 | <bobby85> I have some mounts on the server that do not exist on the LTSP client. How can I have them mounted?
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| 15:28 | <alkisg> bobby85: the error in pastebin sounded like a bad passwd file
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| 15:28 | Re: mounts, what mounts, nfs? See `man ltsp.conf`, FSTAB_* section
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| 15:30 | <bobby85> I have local mounts on the server that do not appear on the client
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| 15:31 | <alkisg> Yes, but what mounts, nfs?
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| 15:32 | Mounts that go in /etc/fstab on the server, can go to the clients with the FSTAB_* ltsp.conf options
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| 15:32 | <bobby85> local devices, such as /dev/sdd7
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| 15:32 | <alkisg> You need to expose them via a network file system, i.e. you'd need to `apt install nfs-kernel-server` first
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| 15:33 | <bobby85> i have that installed already
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| 15:33 | <alkisg> Great, problem solved then
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| 15:33 | <bobby85> sorry, no...
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| 15:34 | <alkisg> Which part you didn't do yet?
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| 15:34 | 1) install nfs, 2) add exports, 3) use fstab in ltsp.conf
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| 16:06 | <bobby37> I have exports in place (hopefully correct)
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| 16:06 | What is missing?
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| 16:15 | <bobby37> Okay, up and running...
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| 16:16 | I didn't get from the documentation that I can make up my own FSTAB_* options
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