IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 17 June 2020 (all times are UTC)
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| 02:04 | <map7__> I've tried many different ways to get the live iso image working like it says in the ltsp ipxe man page with no real success https://pastebin.com/yie2Cew3
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| 02:05 | I have copied the ubuntu.iso to /srv/ltsp/images/ubuntu.img
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| 02:05 | and it is coming up in the menu
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| 04:31 | <alkisg> map7__: you want to boot the iso in ltsp mode, or in iso mode?
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| 04:32 | For ltsp mode, you put it in images
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| 04:32 | For iso mode (without accounts, /home access etc) you leave it as images/.iso, not .img, and you manually put the correct entry
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| 04:32 | The correct entry depends on the .iso, it's not related to ltsp at all
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| 04:32 | while for ltsp mode, if you rename it to .img, it should just work
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| 04:34 | <alkisg> map7, booting .isos renamed to .imgs in ltsp mode, currently only works for debian based distributions; I haven't added support for dracut or geninitrd
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| 04:36 | <map7> ok I was testing ubuntu 12.04 does that use dracut/geninitrd?
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| 04:38 | <map7__> Ok I'll try it in iso mode as I don't need the ltsp features for these distros
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| 04:38 | thanks
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| 04:39 | <alkisg> map7_, why 12.04 and not e.g. 18.04 or 20.04?
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| 04:39 | LTSP mode needs Ubuntu 16.04+
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| 04:39 | As it's the first one that supports systemd
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| 04:40 | <map7> alkisg, I was following the LTSP wiki exactly first off to get something working
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| 04:40 | <alkisg> The 12.04 iso mode example, was an example for iso mode; there's no example for ltsp-mode, as it should just work
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| 04:40 | I.e. 12.04 can't be booted in ltsp mode because it's too old and doesn't have systemd, so I gave an example of booting it in iso mode instead
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| 04:41 | Some live cd systems, NOT all, have "boot from network" ability. Each one needs a different parameter.
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| 04:42 | E.g. ubuntu CDs need boot=casper and nfsroot=; while dracut CDs might need live:nfsroot..., other parameters
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| 04:42 | And I've no idea if arch-based isos can be netbooted without uncompressing them first; but I'm sure that info is available on the net
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| 04:43 | <map7> ok which iso have you tested recently? ie: should I try ubuntu 20.04 to start with?
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| 04:46 | <alkisg> I think I tested 18.04 most of all, but I think I also tested 20.04
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| 04:46 | Ah yes right, with Kubuntu 20.04
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| 04:46 | Back in 2 hours! :)
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| 05:48 | <alkisg> map7, did it work?
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| 05:49 | <map7> kubuntu worked
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| 05:49 | I mounted the loop and everything
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| 05:49 | Do I need to mount the loop on boot?
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| 05:49 | eg: put it in my fstab?
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| 05:50 | Here is exactly what I've done: https://pastebin.com/qD9UQRdj
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| 05:53 | <alkisg> Ah you tested the "boot iso" mode, not the ltsp mode
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| 05:53 | In the iso mode, it's just an iso, you don't have control over it. No need to put anything in fstab, and you can't, anyway
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| 05:54 | <map7> I mean in my servers /etc/fstab file to mount the loop device
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| 05:54 | <alkisg> Ah that's up to you, if you want to do it from fstab or with a manual command/script
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| 05:56 | <map7> ok I think I got it. I manually wanted to have access to System Rescue CD on the network as a bootable ISO for diagnostics
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| 05:56 | on the same LAN as my LTSP machines
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| 05:56 | <alkisg> Btw, what does system rescue cd offer, that standard debian/ubuntu do not?
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| 05:57 | I have yet to find a tool that's in all the special isos, that's not there in the standard distributions...
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| 05:57 | <map7> true, but it's just all setup and ready to go.
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| 05:58 | <alkisg> APPEND archisobasedir=sysresccd ip=dhcp archiso_http_srv=http://10.0.2.4/ checksum
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| 05:58 | From https://www.system-rescue-cd.org/manual/PXE_network_booting/
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| 05:58 | So I guess you just need a small http server to boot that in iso mode
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| 05:59 | They also say that they support nfs, that's probably easier
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| 05:59 | <map7> yeah I've already got NFS setup
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| 05:59 | <alkisg> Right, https://git.archlinux.org/archiso.git/tree/docs/README.bootparams#n102
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| 05:59 | So it should be rather easy
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| 05:59 | <map7> There are some other ISO files I wanted to put in there also
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| 06:00 | Sometimes I install Linux Mint for people and use Kali for security audits
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| 06:00 | <alkisg> You can put all the entries in the ltsp wiki, for others to use them and contribute their own
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| 06:00 | Mint is Ubuntu, it doesn't have different options
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| 06:00 | (and LMDE is Debian)
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| 06:00 | Kali is Debian as well
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| 06:00 | <map7> I might try Kali next
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| 06:01 | <alkisg> So the standard debian boot options apply
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| 06:01 | <map7> Yes I was going to put these up on the WIKI for everyone
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| 06:01 | <alkisg> Great
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| 06:01 | <map7> I think it would be really useful
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| 06:02 | <alkisg> I hear many people trying this, mainly in #ipxe, but ok in #ltsp too
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| 06:02 | And I've found documentation for booting them offline, but not online, via nfs etc
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| 06:02 | <map7> Could you also network boot say Linux Mint and install it on someones local hard drive?
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| 06:02 | <alkisg> netboot xyz has some code for them, but it's code, not documentation
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| 06:02 | Of course, when booting in .iso mode it's the same as if you used a live usb
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| 06:03 | <map7> cool, that would suit my purpose
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| 06:03 | * alkisg prefers to maintain 10GB vmdk images, and just dd them | |
| 06:03 | <alkisg> So it takes e.g. 10 minutes to setup a whole school server
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| 06:04 | Different use case, of course...
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| 06:04 | <map7> that would be handy.
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| 06:11 | alkisg Instead of manually mounting the ISO can I use a loopback in my ipxe?
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| 06:11 | Like so: https://pastebin.com/1BfrLXq3
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| 06:12 | it seemed to complain when using the loopback but maybe I'm doing it wrong
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| 06:12 | <alkisg> map7, cd /tmp; apt source casper; grep -rw iso-scan
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| 06:13 | If you see that the iso-scan option has code that loop-mounts .iso over NFS, only then you can do that
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| 06:13 | I.e. it's an initramfs matter, per distribution, not a pxe/bootloader matter
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| 06:14 | <map7> ah, ok. I don't see it on my machine
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| 06:15 | <alkisg> E.g. Ubuntu calls this "find_iso", not iso-scan
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| 06:15 | <map7> I'm using debian testing on the LTSP server
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| 06:16 | <alkisg> It's the initramfs of the iso. the server isn't related to this.
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| 06:16 | <map7> ok
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| 06:20 | <alkisg> I see that Ubuntu 20.04 has a "url=*.iso" option
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| 06:20 | I think this one downloads the .iso, and can loop-mount it
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| 06:20 | So it can do what you want, but it will waste time to download all of it, and RAM to contain it
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| 06:21 | <map7> hmmm, so you suggest just mounting the loop device and doing it that way
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| 06:21 | <alkisg> Plain NFS is the most widely supported method
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| 06:21 | <map7> I'm going to store the '.iso' files in /srv/ltsp directory
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| 06:21 | <alkisg> Put them in /srv/ltsp/images/*.iso
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| 06:21 | Just don't rename them to .img
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| 06:22 | <map7> ok
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| 06:22 | <alkisg> And if you want some of them to ALSO be available in LTSP mode, then use a symlink, from .img to .iso
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| 06:22 | Then `ltsp ipxe` will auto-add them to the menu
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| 06:22 | <map7> ah nice
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| 06:23 | <alkisg> symlinks inside nfs work; outside the nfs root dir, they don't
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| 06:25 | <map7> noted
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| 06:25 | I'll add some of this info to the WIKI as it's good knowledge to have on hand
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| 06:59 | <map7> alkisg, When trying knoppix I get the following error: Could not locate vmlinuz and initrd.img in knoppix
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| 06:59 | on the 'ltsp kernel knoppix'
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| 07:00 | <alkisg> map7, man ltsp kernel, see the KERNEL_INITRD parameter
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| 07:00 | I didn't test ALL distributions; you need to tell ltsp kernel where the kernel is
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| 07:03 | <map7> bit of problem
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| 07:03 | if I type sudo ltsp kernel knoppix --kernel-initrd="knoppix/boot/isolinux/linuz s|linuz|balder.img|"
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| 07:03 | It displays error 'Could not locate vmlinuz and initrd.img in knoppix'
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| 07:03 | If I drop the knoppix out of that command then it overrides my 'debian' folder
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| 07:03 | which is for my LTSP
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| 07:05 | <alkisg> map7, do a vnc
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| 07:05 | !vnc-dide
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| 07:05 | <ltspbot> 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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| 07:10 | <alkisg> map7, this is not an initramfs
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| 07:10 | Boot knoppix, run `cat /proc/cmdline`
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| 07:10 | To see its kernel and initrd
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| 07:11 | <map7> ok, but regardless of that should it put them into /srv/ltsp/knoppix in the end?
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| 07:12 | I mean /srv/tftp/ltsp/knoppix
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| 07:12 | <alkisg> ltsp kernel should put them there, yes, not you
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| 07:12 | sudo ltsp kernel knoppix --kernel-initrd="boot/isolinux/linuz s|linuz|balder.img|"
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| 07:12 | Without "knoppix" there, as it should look into a subdir
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| 07:15 | <map7> So I just booted knoppix there in the virtualbox
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| 07:16 | You can see
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| 07:17 | Can I use a .gz as the initrd?
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| 07:20 | <alkisg> map7, sure
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| 07:20 | The knoppix iso has 3 partitions
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| 07:20 | So you would need to mount the second one, see the kernel is there
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| 07:21 | Anyway copy it manually for now
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| 07:21 | and rename them to vmlinuz/initrd.img
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| 07:21 | <map7> ok
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| 07:21 | <alkisg> (copy them to tftp)
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| 07:21 | `ltsp kernel` can do it automatically, but you'd need to run the "advanced image sources" section of the `man ltsp ipxe` man page
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| 07:21 | ...to be able to specify the partition
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| 07:23 | <map7> should I uncompress the minirt.gz file first before naming it initrd.img?
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| 07:23 | <alkisg> No
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| 07:23 | but you'd need to run ==> I meant you'd need to read
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| 07:37 | <map7> alkisg, That got pretty close then my computer crashed for some reason
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| 07:37 | <alkisg> The server? Heh, strange
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| 07:37 | <map7> no my notebook
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| 07:38 | Knoppix now boots through ipxe a little bit then drops to shell
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| 07:38 | cannot mount /mnt-system
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| 07:38 | is this because the CD image has three partitions?
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| 07:40 | <alkisg> You would need to read the knoppix initramfs code, see which parameters it supports for netbooting, and pass them
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| 07:40 | This isn't related to the number of partitions, no
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| 07:40 | Each initramfs technology has its own parameters for netbooting, you need to find them
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| 07:41 | <map7> ok I'll have a look.
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| 07:41 | <alkisg> It would be nice if they all supported the same syntax, but unfortunately it's chaos
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| 07:41 | <map7> yeah I'm learning that today
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| 07:41 | <alkisg> The kernel had a nice nfsroot= and loop= etc, but noone really respected them, except old classic distros like debian
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| 07:42 | The only good part is that there are only 10 or so different initramfs technologies
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| 07:42 | initramfs-tools, casper, debian-live, dracut, the arch-linux one, the knoppix one, etc
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| 07:43 | (and ltsp, that tries to use a common command line for all, and cover the rest with code, trying to lessen the confusion :))
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| 07:44 | <map7> ok well I better go to dinner. I might try System Rescue CD next and Kali which are the main two I want
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| 07:44 | Knoppix is optional so I can leave that out for now.
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| 07:45 | I'm documenting everything as I go and I'll put it up on the wiki in that section already made
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| 07:45 | At least I got kubuntu 20.04 working nicely.
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| 07:45 | <alkisg> Yeah go ahead and maintain that page, I just put it there as an example for someone to continue it
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| 07:45 | <map7> ok cheers
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| 07:47 | <alkisg> Cheers
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| 10:40 | <quinox> booting LTSP is faster than booting rescue mode from the Ubuntu netinstaller :D
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| 14:08 | <alkisg> Heya vagrantc, different timezone? :)
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| 14:09 | If you have time these days, maybe it would make sense to upload 20.60 to unstable, as I've committed a few bug fixes...
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| 14:09 | *20.06
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| 14:09 | <vagrantc> just not enough sleep :/
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| 14:10 | <alkisg> Ouch
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| 14:10 | <vagrantc> could probably work in a little testing and upload in the coming few days
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| 14:10 | <alkisg> Great, I can tag tomorrow if it'll help
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| 14:11 | I've prepared the changelog, I just didn't commit it yet
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| 14:11 | <vagrantc> go ahead and tag, worst case is I can tag a minor version bump if needed
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| 14:13 | <alkisg> Ty, will do
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