IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 12 March 2018 (all times are UTC)
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| 07:51 | <alkisg> !sudo
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| 07:51 | <ltsp> I do not know about 'sudo', but I do know about these similar topics: 'sudoers', 'fat-sudo'
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| 07:51 | <alkisg> !sudoers
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| 07:51 | <ltsp> sudoers: Not recommented for security reasons: RCFILE_01="echo USER ALL=NOPASSWD: /path/to/program >> /etc/sudoers". USER and /path/to/program can also be ALL.
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| 07:51 | <alkisg> !fat-sudo
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| 07:51 | <ltsp> fat-sudo: to allow members of the sudo group to execute "sudo" in fat clients without a password prompt, put this in lts.conf: RCFILE_01="echo '%sudo ALL=NOPASSWD: ALL' >> /etc/sudoers"
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| 07:51 | <alkisg> !LDM_PASSWORD_HASH
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| 07:51 | <ltsp> LDM_PASSWORD_HASH: LDM_PASSWORD_HASH=True in lts.conf saves the password hash to /etc/shadow on login, so that the users can unlock the screensaver etc. If they happen to change their password though, that only takes effect until logout.
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| 07:52 | <alkisg> fiesh: so... you would start by setting this in lts.conf: LDM_PASSWORD_HASH=True
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| 07:52 | <fiesh> ah!
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| 07:52 | <alkisg> That would allow you to re-authenticate on the client, otherwise there's no password on the client and you can't reuse su or sudo or login
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| 07:52 | <fiesh> I see, ok that should probably do it
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| 07:52 | <alkisg> Then, if the user is in the wheel group, all should be fine
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| 07:53 | <alkisg> If you want temporary sudo access only on the clients, there are the other 2 options that I pasted first, sudoers and fat-sudo
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| 07:53 | <fiesh> I'll go for perma sudo :)
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| 07:53 | <alkisg> :)
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| 07:54 | Ping if you need vnc/help
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| 07:54 | <fiesh> yes, thank you!
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| 07:55 | hmm still can't sudo
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| 07:55 | which means I can't figure out if /etc/shadow is correctly populated
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| 07:56 | so I'll go for the other option to see what gives..
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| 07:58 | ok that doesn't work either, wtf...
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| 07:58 | <alkisg> !vnc-edide
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| 07:58 | <ltsp> 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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| 07:58 | <alkisg> !vnc-dide
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| 07:58 | <ltsp> 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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| 07:58 | <alkisg> fiesh: give me root access to the client somehow
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| 07:58 | <fiesh> hmm ok, I'll have to go for ssh then I guess
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| 07:58 | hold on with the vnc then, I need to reboot it
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| 07:59 | ah no, virutalbox works, so I can do it there
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| 07:59 | but first need to enable ssh access I guess, have no root currnetly
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| 07:59 | <alkisg> fiesh: if you have vbox, SCREEN_02=shell; SCREEN_07=ldm will do
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| 07:59 | fiesh: eeh or we can just login as root in vt1 :D
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| 08:00 | <fiesh> ah
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| 08:00 | hah
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| 08:00 | <alkisg> Let's do that. Login as the user graphically, then switch to vt1 and login as root
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| 08:00 | <fiesh> hmmm
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| 08:00 | how do I switch to vt1 in vbox?
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| 08:00 | <alkisg> Right Ctrl + F1
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| 08:00 | <fiesh> without switching to vt1 for real
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| 08:01 | ah
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| 08:01 | <alkisg> OK RCFILE doesn't work there
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| 08:02 | Let's switch it to INIT_COMMAND_xxx instead
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| 08:02 | Go to your lts.conf
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| 08:02 | INIT_COMMAND_SUDOERS="echo '%sudo ALL=NOPASSWD: ALL' >> /etc/sudoers"
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| 08:02 | And do it like that ^
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| 08:02 | Waaait
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| 08:03 | lts.conf is in tftp
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| 08:03 | not in the chroot
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| 08:03 | <fiesh> yeah just realized ;)
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| 08:03 | <alkisg> Seems fine, reboot client
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| 08:03 | <fiesh> ok
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| 08:04 | <alkisg> RCFILE is getting deprecated anyway with systemd, so we'll probably remove it from ltsp completely anyway
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| 08:05 | <fiesh> hmm the line is present now, but it's not working, surprisingly
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| 08:07 | ok omg, hehe
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| 08:07 | <alkisg> fiesh: you have wheel in gentoo :)
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| 08:07 | We have "sudo" in Ubuntu :D
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| 08:07 | <fiesh> BSD style
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| 08:07 | <alkisg> Change lts.conf to match that
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| 08:07 | <fiesh> strangely though, why is shadow not popultaed?
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| 08:08 | but actually, it's fine
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| 08:08 | I mean root on the thin client isn't that powerful anyway
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| 08:09 | and then only wheel members, that's perfectly fine
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| 08:09 | maybe even better than mirroring shadow, who knows
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| 08:09 | so let's leave it at that!
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| 08:13 | alkisg: thank you!
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| 08:13 | <alkisg> fiesh: sorry, was on phone
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| 08:13 | <fiesh> no worries :)
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| 08:13 | all good
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| 08:13 | <alkisg> So the problem probably is that you don't have the newer ldm
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| 08:14 | which supports LDM_PASSWORD_HASH
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| 08:14 | <fiesh> ah I see
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| 08:14 | <alkisg> If you'll need it, ping me
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| 08:14 | <fiesh> it's fine like this, thank you!
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| 08:14 | <alkisg> It needs compilation, it's not a script, it's .c
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| 08:14 | Cool
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| 08:14 | OK!
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| 08:43 | <fiesh> alkisg: ping again
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| 08:43 | alkisg: I have a question, I run ltsp-update-image, the current situation is:
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| 08:44 | <alkisg> Yup?
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| 08:44 | <fiesh> there are amd64.img and an identical amd64.img.old
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| 08:44 | it creates a different amd64.img.tmp
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| 08:44 | then says
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| 08:44 | mv: '/opt/ltsp/images/amd64.img' and '/opt/ltsp/images/amd64.img.old' are the same file
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| 08:44 | and doesn't update amd64.img but rather leaves it as is, and I end up with a new .tmp file
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| 08:44 | is this intended/
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| 08:44 | ?
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| 08:44 | am I doing something wrong?
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| 08:45 | <fiesh> ahhhh... maybe it comes from your hard link is the fastest cp?
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| 08:45 | and the script does an mv ... && cmd-that-now-fails
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| 08:45 | heh I think that's the problem
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| 08:45 | hard link is not a good cp :)
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| 08:47 | <alkisg> Ouch :D
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| 08:47 | Let me test locally...
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| 08:48 | <fiesh> yeah cp --reflink is jsut better ;)
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| 08:48 | if only it worked with zfs
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| 08:49 | <alkisg> I would claim that this is a bug in mv
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| 08:49 | mv a b, where a is a hardlink of b, should just delete a...
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| 08:50 | I don't usually use hardlinks though, so no need to worry about it wrt ltsp code...
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| 08:50 | <fiesh> sounds reasonable, but that behavior is never going to be changed, hehe
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| 09:06 | <fiesh> alkisg: ok, so I do need /dev to be bind-mounted in order for gentoo's eselect to work correctly
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| 09:06 | alkisg: how can I add that so that it's automatically mounted when I do an ltsp-chroot?
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| 09:06 | alkisg: should probably go upstream, for gentoo support that is
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| 09:08 | (and I kind of suspect I added /sys for a similar reason back then)
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| 09:45 | <fiesh> !hosts
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| 09:45 | <ltsp> I do not know about 'hosts', but I do know about these similar topics: 'dhcp-hosts'
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| 09:45 | <fiesh> hmm
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| 09:45 | !/etc/hosts
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| 09:45 | <ltsp> Error: "/etc/hosts" is not a valid command.
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| 09:45 | <fiesh> nope
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| 09:46 | alkisg: how do I add entries to the client's /etc/hosts?
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| 09:49 | <alkisg> fiesh: ltsp-chroot -m does bind-mount /dev
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| 09:49 | It doesn't bind-mount /sys though; if you need it we should add it upstream
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| 09:49 | To add entries to the clients, use:
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| 09:50 | HOSTS_BLABLA="entry" in lts.conf
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| 10:17 | <fiesh> alkisg: hmm, eselect just complainedf about not having /dev/pts/62 or so
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| 10:21 | <alkisg> fiesh: that is with ltsp-chroot -m, right? Can you see <chroot>/dev/pts bind-mounted if you run `cat /proc/mounts` on the server?
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| 10:26 | <fiesh> alkisg: you're right, sorry, I must mixed something up not seeing the mount
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| 10:59 | <fiesh> alkisg: ok, now I have the phenomenon again that it picks the wrong directory to create the image, like we had once, the thin client directory
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| 11:00 | alkisg: I'll get lunch really quickly, maybe we can look at it then
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| 11:23 | <alkisg> fiesh: you can use this to avoid it once and for all: ltsp-update-image amd64
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| 11:24 | fiesh: I'll also have a look at the code to see why it would be random... possibly find needs to be sorted or something first...
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| 11:25 | Hmm actually in the newest version of ltsp-update-image, if you don't pass a parameter, it updates all chroots
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| 11:26 | I'd need to look if you have the older version of it
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| 11:26 | We only updated the client ltsp, not the server part...
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| 11:41 | <WhoIAm> Hi everyone. Now i m stucked . My ltsp client connect with trunk port and i need to setup vlan from on trunk on client side . Now client can t boot due eth0 cannot obtain any address
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| 11:42 | I mean i need bring int vlan on client side while client boots
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| 11:42 | <alkisg> WhoIAm: I'm not sure what you're saying... are you saying that DHCP doesn't work with your VLAN?
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| 11:46 | <WhoIAm> alkisg, here is my topology ltsp server with trunk port connected. On ltsp server i bring up inerface vlan 230 on this interface working dhcp server. My thin client (in my case it is old servers) connected to network via trunk too. I can t use access ports only trunk. In client bios i setup vlan tag and client boots up fine until eth0 should up at this point clien stops due it cant access to server
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| 11:48 | <alkisg> WhoIAm: do you get a busybox prompt, e.g. initramfs> ?
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| 11:48 | <ZAJDAN> Hi... needs LTSP for clients some opened ports? or I can close all in firewall?
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| 11:49 | <alkisg> If not, boot the client with some live usb stick, and run this, and paste the output: /usr/lib/klibc/bin/ipconfig -n enp0s3
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| 11:49 | ...where enp0s3 is your network card, you can see it with `ip a`.
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| 11:50 | <WhoIAm> alkisg, yes busy box appears after eth0 can t get ip address
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| 11:52 | <ZAJDAN> probably I found it: https://help.ubuntu.com/community/UbuntuLTSP/LTSPFirewall
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| 12:11 | <ZAJDAN> will be good put more details information also here which ports exactly are needs to be open: http://wiki.ltsp.org/wiki/Concepts#Firewall_.26_Port_Blocker
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| 13:00 | <fiesh> alkisg: I'm back in case you're here
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| 13:11 | <alkisg> fiesh: here, you?
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| 13:18 | <fiesh> yes, again
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| 13:18 | sorry, busy day ;)
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| 13:18 | can you ssh to here?
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| 13:18 | alkisg: "tmux -S /tmp/shared attach" again
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| 13:19 | alkisg: in case it works out
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| 14:11 | <alkisg> fiesh: so, I think it's generating the image for both amd64 and amd64.head; but, it strips .* so both end up with the same name, amd64
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| 14:12 | And, depending on the inode or something other internal to "find" order, the last one is either the fat or the thin
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| 14:12 | fiesh: quick workaround: rename amd64.head to amd64-head
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| 14:15 | (along with the tftp dir and the pxelinux.cfg and nfs of course)
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| 14:24 | <ZAJDAN> alkisg: how it is with the ports please? is enough enable (67,69) ?
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| 14:41 | <fiesh> alkisg: ah, I'll give that a shot, thanks!
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| 14:46 | <alkisg> ZAJDAN: there are many ports involved, can't list them all here
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| 14:46 | Run netstat to see the server open ports etc
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| 14:47 | <ZAJDAN> alkisg: I thought that exist some official list of required ports for LTSP
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| 14:48 | <alkisg> ZAJDAN: you can edit the wiki if you want and write it
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| 14:48 | I don't think anyone bothers with documentation anymore :)
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| 14:50 | <ZAJDAN> on my machine: http://termbin.com/j44u
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