IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 12 March 2018   (all times are UTC)

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07:51
<alkisg>
!sudo
07:51
<ltsp>
I do not know about 'sudo', but I do know about these similar topics: 'sudoers', 'fat-sudo'
07:51
<alkisg>
!sudoers
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.
07:51
<alkisg>
!fat-sudo
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"
07:51
<alkisg>
!LDM_PASSWORD_HASH
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.
07:52
<alkisg>
fiesh: so... you would start by setting this in lts.conf: LDM_PASSWORD_HASH=True
07:52
<fiesh>
ah!
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
07:52
<fiesh>
I see, ok that should probably do it
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
07:53
<fiesh>
I'll go for perma sudo :)
07:53
<alkisg>
:)
07:54
Ping if you need vnc/help
07:54
<fiesh>
yes, thank you!
07:55
hmm still can't sudo
07:55
which means I can't figure out if /etc/shadow is correctly populated
07:56
so I'll go for the other option to see what gives..
07:58
ok that doesn't work either, wtf...
07:58
<alkisg>
!vnc-edide
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
07:58
<alkisg>
!vnc-dide
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.
07:58
<alkisg>
fiesh: give me root access to the client somehow
07:58
<fiesh>
hmm ok, I'll have to go for ssh then I guess
07:58
hold on with the vnc then, I need to reboot it
07:59
ah no, virutalbox works, so I can do it there
07:59
but first need to enable ssh access I guess, have no root currnetly
07:59
<alkisg>
fiesh: if you have vbox, SCREEN_02=shell; SCREEN_07=ldm will do
07:59
fiesh: eeh or we can just login as root in vt1 :D
08:00
<fiesh>
ah
08:00
hah
08:00
<alkisg>
Let's do that. Login as the user graphically, then switch to vt1 and login as root
08:00
<fiesh>
hmmm
08:00
how do I switch to vt1 in vbox?
08:00
<alkisg>
Right Ctrl + F1
08:00
<fiesh>
without switching to vt1 for real
08:01
ah
08:01
<alkisg>
OK RCFILE doesn't work there
08:02
Let's switch it to INIT_COMMAND_xxx instead
08:02
Go to your lts.conf
08:02
INIT_COMMAND_SUDOERS="echo '%sudo ALL=NOPASSWD: ALL' >> /etc/sudoers"
08:02
And do it like that ^
08:02
Waaait
08:03
lts.conf is in tftp
08:03
not in the chroot
08:03
<fiesh>
yeah just realized ;)
08:03
<alkisg>
Seems fine, reboot client
08:03
<fiesh>
ok
08:04
<alkisg>
RCFILE is getting deprecated anyway with systemd, so we'll probably remove it from ltsp completely anyway
08:05
<fiesh>
hmm the line is present now, but it's not working, surprisingly
08:07
ok omg, hehe
08:07
<alkisg>
fiesh: you have wheel in gentoo :)
08:07
We have "sudo" in Ubuntu :D
08:07
<fiesh>
BSD style
08:07
<alkisg>
Change lts.conf to match that
08:07
<fiesh>
strangely though, why is shadow not popultaed?
08:08
but actually, it's fine
08:08
I mean root on the thin client isn't that powerful anyway
08:09
and then only wheel members, that's perfectly fine
08:09
maybe even better than mirroring shadow, who knows
08:09
so let's leave it at that!
08:13
alkisg: thank you!
08:13
<alkisg>
fiesh: sorry, was on phone
08:13
<fiesh>
no worries :)
08:13
all good
08:13
<alkisg>
So the problem probably is that you don't have the newer ldm
08:14
which supports LDM_PASSWORD_HASH
08:14
<fiesh>
ah I see
08:14
<alkisg>
If you'll need it, ping me
08:14
<fiesh>
it's fine like this, thank you!
08:14
<alkisg>
It needs compilation, it's not a script, it's .c
08:14
Cool
08:14
OK!
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08:43
<fiesh>
alkisg: ping again
08:43
alkisg: I have a question, I run ltsp-update-image, the current situation is:
08:44
<alkisg>
Yup?
08:44
<fiesh>
there are amd64.img and an identical amd64.img.old
08:44
it creates a different amd64.img.tmp
08:44
then says
08:44
mv: '/opt/ltsp/images/amd64.img' and '/opt/ltsp/images/amd64.img.old' are the same file
08:44
and doesn't update amd64.img but rather leaves it as is, and I end up with a new .tmp file
08:44
is this intended/
08:44
?
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?
08:45
and the script does an mv ... && cmd-that-now-fails
08:45
heh I think that's the problem
08:45
hard link is not a good cp :)
08:47
<alkisg>
Ouch :D
08:47
Let me test locally...
08:48
<fiesh>
yeah cp --reflink is jsut better ;)
08:48
if only it worked with zfs
08:49
<alkisg>
I would claim that this is a bug in mv
08:49
mv a b, where a is a hardlink of b, should just delete a...
08:50
I don't usually use hardlinks though, so no need to worry about it wrt ltsp code...
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
09:06
alkisg: how can I add that so that it's automatically mounted when I do an ltsp-chroot?
09:06
alkisg: should probably go upstream, for gentoo support that is
09:08
(and I kind of suspect I added /sys for a similar reason back then)
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09:45
<fiesh>
!hosts
09:45
<ltsp>
I do not know about 'hosts', but I do know about these similar topics: 'dhcp-hosts'
09:45
<fiesh>
hmm
09:45
!/etc/hosts
09:45
<ltsp>
Error: "/etc/hosts" is not a valid command.
09:45
<fiesh>
nope
09:46
alkisg: how do I add entries to the client's /etc/hosts?
09:49
<alkisg>
fiesh: ltsp-chroot -m does bind-mount /dev
09:49
It doesn't bind-mount /sys though; if you need it we should add it upstream
09:49
To add entries to the clients, use:
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?
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
11:00
alkisg: I'll get lunch really quickly, maybe we can look at it then
11:23
<alkisg>
fiesh: you can use this to avoid it once and for all: ltsp-update-image amd64
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...
11:25
Hmm actually in the newest version of ltsp-update-image, if you don't pass a parameter, it updates all chroots
11:26
I'd need to look if you have the older version of it
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
11:42
I mean i need bring int vlan on client side while client boots
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
11:48
<alkisg>
WhoIAm: do you get a busybox prompt, e.g. initramfs> ?
11:48
<ZAJDAN>
Hi... needs LTSP for clients some opened ports? or I can close all in firewall?
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
11:49
...where enp0s3 is your network card, you can see it with `ip a`.
11:50
<WhoIAm>
alkisg, yes busy box appears after eth0 can t get ip address
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?
13:18
<fiesh>
yes, again
13:18
sorry, busy day ;)
13:18
can you ssh to here?
13:18
alkisg: "tmux -S /tmp/shared attach" again
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
14:12
And, depending on the inode or something other internal to "find" order, the last one is either the fat or the thin
14:12
fiesh: quick workaround: rename amd64.head to amd64-head
14:15
(along with the tftp dir and the pxelinux.cfg and nfs of course)
14:24
<ZAJDAN>
alkisg: how it is with the ports please? is enough enable (67,69) ?
14:41
<fiesh>
alkisg: ah, I'll give that a shot, thanks!
14:46
<alkisg>
ZAJDAN: there are many ports involved, can't list them all here
14:46
Run netstat to see the server open ports etc
14:47
<ZAJDAN>
alkisg: I thought that exist some official list of required ports for LTSP
14:48
<alkisg>
ZAJDAN: you can edit the wiki if you want and write it
14:48
I don't think anyone bothers with documentation anymore :)
14:50
<ZAJDAN>
on my machine: http://termbin.com/j44u
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