IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 7 September 2017 (all times are UTC)
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| 06:22 | <alkisg> !client-list
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| 06:22 | <ltsp> client-list: to get a list of all nbd-clients (which sometimes is the same as ltsp clients), run: netstat -tn | sed -n 's/.*:10809 *\([0-9.]*\):.*/\1/p' | sort -Vu
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| 09:34 | <tarzeau> ltsp-manager_17.08_all.deb
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| 09:34 | this is the version i got by git download and debuild
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| 09:34 | anything else i can test or try?
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| 09:34 | <alkisg> tarzeau: well, we have a .deb in our ppa
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| 09:34 | You can just use that one
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| 09:34 | Do you have any issues that are unreported or unresolved?
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| 09:34 | <tarzeau> but your .deb is for ubuntu 16.04 ?
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| 09:35 | and i was trying on stretch (that's why i rebuilt the src pkg)
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| 09:35 | <alkisg> It fits for stretch too
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| 09:35 | <tarzeau> yes as root, i run ltsp-manager and nothing happens. it just hangs
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| 09:35 | <alkisg> Not many differences between them...
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| 09:35 | <tarzeau> [ root@methyer:/scratch/ltsp/ >
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| 09:35 | # ltsp-manager
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| 09:35 | <alkisg> Why do you run it as root?
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| 09:35 | <tarzeau> i was told to run it as root?
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| 09:35 | 17:03 < alkisg> tarzeau: about ltsp-manager -h, it works fine if you run it with pkexec or as root as it's supposed to be ran, but it's indeed an issue that -h should bug about that
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| 09:36 | oh wait, after a while a window pops up
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| 09:36 | <alkisg> Wait, the point is to get the -h entry, or to run ltsp-manager?
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| 09:36 | ltsp manager runs from the gui menu
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| 09:36 | <tarzeau> both!
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| 09:36 | <alkisg> This indirectly calls pkexec, which authenticates
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| 09:36 | And if you run ltsp-manager from the gnome/mate etc menu, it doesn't run?
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| 09:36 | Somewhere under the system menu, depending on your DE
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| 09:37 | <tarzeau> the gui hangs. we've got like 1000+ users (ldap/nis)
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| 09:37 | <alkisg> does `time getent passwd username` take a long time?
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| 09:38 | <tarzeau> real 0m0.004s
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| 09:38 | rest 0, 0
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| 09:38 | ypcat passwd |wc -l
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| 09:38 | 7739
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| 09:38 | but only ~1000 +-300 are active
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| 09:39 | but i guess i should run ltsp-manager on the ltsp server anyways, and not just on a standard computer
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| 09:41 | if users are supposed to run it, should it not be in /usr/bin ? it's in /usr/sbin which my users PATH doesn't point to
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| 09:41 | ah and -h works. it just hangs the same amount of time until the gui appears
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| 09:42 | it would make sense to really display the help, without a # time ltsp-manager -h
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| 09:42 | (going to tell you how much i have to wait for some stdout letters)
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| 09:42 | real 0m27.362s
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| 09:42 | user 0m2.128s
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| 09:42 | sys 0m1.784s
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| 09:42 | half a minute
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| 09:43 | and as a user, i get a traceback for -v soemthing about: twisted.python._inotify.INotifyError: Failed to add watch on ''/etc/shadow'' - (-1)
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| 09:46 | edit lts.conf opens the wrong lts.conf here, the one from /var/lib/tftpboot/ltsp/i386 instead of the one amd64/lts.conf
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| 09:46 | complete Groups/Users is unusable here, since we have our users in nis/ldap
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| 09:48 | the application relies on the window maker to have a quit button, but it should provide a file,exit/quit
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| 09:48 | <alkisg> Users aren't supposed to run ltsp manager
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| 09:48 | <tarzeau> other than that, probably great
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| 09:49 | <alkisg> It's a sysadmin thing
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| 09:49 | bbiab
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| 09:55 | <tarzeau> now i get it! if run as root, this dialog:
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| 09:55 | === AUTHENTICATING FOR org.ltsp.ltsp-manager ===
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| 09:55 | Authentication is required to run LTSP Manager.
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| 09:55 | Authenticating as: root
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| 09:55 | is from pkexec, trying to authenticate as root
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| 09:56 | since we have a bit a different way of becoming root (no root ssh logins, and no local root logins without usb key 2factor) it doesn't work, unless fixing pam configurations
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| 09:56 | that is why i can just launch it as root, and then it works, what the 30 second delay at startup causes, not sure. if you want to improve i can try to run it with strace/ltrace to figure out
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| 10:01 | <alkisg> back
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| 10:01 | tarzeau: /usr/sbin is the normal path for system programs, like ltsp-update-image etc
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| 10:01 | It's in the path when you're a sudoer
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| 10:02 | The best way to launch it is from the gui menu which invokes pkexec
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| 10:02 | If you want to launch it from the command line without being a sudoer, then, as a *user* run: /usr/sbin/ltsp-manager
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| 10:02 | <alkisg> It will invoke pkexec and authenticate as needed
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| 10:03 | About the big delay, it sounds like a problem in your setup, it doesn't sound ltsp-manager related
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| 10:03 | <tarzeau> the dialog i got, was just not very clear to me, that was why i was confused
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| 10:03 | <alkisg> Editing lts.conf should open *all* lts.conf that are there
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| 10:03 | Not the first one, but all of them
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| 10:03 | pkexec is the recommended method for applications to run as root, while respecting policykit
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| 10:04 | If you find the point which causes the 30 sec delay, and it's related to ltsp manager, then sure I can put patches or workarounds
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| 10:05 | <tarzeau> can't strace/ltrace python code properly, but it kind of keeps hanging at:
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| 10:05 | close(-1) = -1 EBADF (Bad file descriptor)
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| 10:05 | wait4(-1, 0x7fffbbb1784c, 0, NULL) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
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| 10:05 | --- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
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| 10:05 | wait4(-1, ^Cstrace: Process 21676 detached
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| 10:05 | <detached ...>
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| 10:05 | it seems you are nohuping/forking processes to launch stuff
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| 10:05 | ltsp-manager starts ltsp-manager.py
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| 10:05 | <alkisg> strace -f attaches to child processes
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| 10:05 | <tarzeau> which does other stuff.
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| 10:06 | ack... a lot more output now
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| 10:06 | <alkisg> Need to go for now, will read logs when I come back, and reply then
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| 10:06 | <tarzeau> it seems to open /etc/group a million times
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| 10:06 | <alkisg> Probably enumerates through the users
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| 10:07 | File a bug report for a dev to test with e.g. 1000 user accounts
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| 10:07 | <tarzeau> but it always only shows: [pid 5496] open("/etc/group", O_RDONLY|O_CLOEXEC) = 11
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| 10:07 | then closes it again
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| 10:07 | <alkisg> Btw, running ltsp-manager elsewhere than the ltsp server doesn't make much sense
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| 10:07 | Yeah it just reads a user, then reads the next one etc
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| 10:07 | <tarzeau> but here it only reads the first one
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| 10:07 | and then something with /var/run/nslcd/socket happens
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| 10:07 | <alkisg> bbl, will reply then...
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| 10:08 | <tarzeau> cu
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| 10:09 | <tarzeau> # find . -name lts.conf
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| 10:09 | ./ltsp/amd64/lts.conf
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| 10:09 | ./ltsp/i386/lts.conf
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| 10:09 | making sure if we have the amd64/lts.conf indeed, however ltsp-manager only opened the i386/lts.conf in gedit, not the one we really use. the ohter one is a left over, not being used anymore
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| 10:29 | <antares_> hello all. Is it possible to make a backup of a chroot from a ltsp running machine and put it in another ltsp machine?
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| 10:29 | machine=server
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| 10:50 | <vlt> antares_: Well, what stops you from exactly doing what you described?
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| 12:55 | <q9> Hi, if put my private ssh-key into ~root/.ssh/id_rsa ldm finds an uses it. But where do I put the key of a second user?
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| 13:37 | <alkisg> q9: what are you trying to do?
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| 13:37 | Autologin with ssh keys?
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| 13:38 | tarzeau: doesn't ltsp-manager open all lts.conf for you? It executes this, which is supposed to open all: for f in glob.glob('/var/lib/tftpboot/ltsp/*/lts.conf'): self.edit_file(f)
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| 13:39 | Maybe gedit opened them in 2 tabs, and you didn't see the first tab?
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| 13:39 | <tarzeau> maybe, let me retry
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| 13:39 | alkisg: that's python, right?
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| 13:40 | <alkisg> Yes, in ltsp-manager.py
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| 13:40 | <tarzeau> however at starting ltsp-manager, i keep getting the window "Initial LTSP setup" You need to run the initial ltsp setup actions.
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| 13:41 | indeed, two tabs
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| 13:41 | gee that gedit is ugly
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| 13:43 | <alkisg> tarzeau: that window will keep nagging you until you accept it :)
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| 13:43 | <tarzeau> why does it open firefox as root, for the help/live chat?
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| 13:43 | <alkisg> I didn't implement an ignore option yet, and I'm not sure it's needed
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| 13:43 | <tarzeau> alkisg: what does it do if i accept it? break my ltsp servers?
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| 13:43 | <alkisg> Because you run it as root instead of from the menu with pkexec
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| 13:43 | <tarzeau> i guess it's great to setup and get running an ltsp server
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| 13:43 | <alkisg> less /usr/share/ltsp-manager/initial-setup.sh to see
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| 13:44 | <tarzeau> but our setup is well, different. two ltsp servers, with glusterfs
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| 13:44 | 2 dhcp servers, and additionally an rdp windows server
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| 13:45 | you should add checks before trying to service network-manager whatever, if network-manager is installed at all (we don't have it)
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| 13:45 | likewise for dnsmasq (we have it though, nobody is required to have it)
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| 13:49 | here's some strace -f output: https://people.phys.ethz.ch/~myczko/ltsp/ltsp-manager-strace-f.log
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| 13:49 | maybe you have an idea looking at it, what causes ltsp-manager to take 30 seconds to start
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| 13:50 | indeed reading in all the users
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| 13:51 | time ypcat passwd > /dev/null
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| 13:51 | ypcat passwd > /dev/null 0.00s user 0.00s system 4% cpu 0.098 total
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| 13:52 | however using ypcat passwd to get the users is way faster, than i have no idea how you read them. getent?
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| 13:52 | time getent passwd > /dev/null
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| 13:52 | getent passwd > /dev/null 0.02s user 0.00s system 0% cpu 2.845 total
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| 13:52 | no idea why getent is way much slower
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| 14:19 | <alkisg> tarzeau: ltsp-manager is for setting up ltsp in small labs, with posix accounts etc
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| 14:19 | You have a large setup without dnsmasq, with ldap, etc etc, clearly ltsp-manager isn't for you
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| 14:19 | ltsp-manager is for implementing a small, recommended setup. If we add checks for everything, it's not the small recommended setup anymore
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| 14:20 | I read them with getent, yes
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| 14:22 | <tarzeau> but even just getent on the console only takes < 3 seconds, while ltsp-manager users almost 30 seconds
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| 14:22 | anyways. yes i figured it's not for me/us, i just gave it a short try, what could it do, and what not
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| 14:23 | <tarzeau> what i wonder is will you make the ltsp-manager, also a user-manager (without ltsp), just for posix accounts?
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| 14:23 | because i couldn't find any useful graphical useramanager, working with /etc/passwd,shadow,group
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| 14:23 | (because i was writing one, well wanted to 10 years ago, and now, really writing it, although using gnustep-gui/applicationkit.h)
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| 14:30 | <fitzman> Hello, I have deployed ubuntu 14.04, after chroot update I have some users that can login fine and a few just spin and come to login screen
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| 14:32 | sorry can not login after the update. everyone else is fine. The users are valid user and worked before. The system auths the account fine just fails for there xsession
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| 14:42 | <alkisg> fitzman: do you have the greek schools ppa in your sources?
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| 14:42 | !greek-schools-ppa
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| 14:42 | <ltsp> greek-schools-ppa: https://launchpad.net/~ts.sch.gr/+archive/ppa/ supports LTS Ubuntu releases with newer LTSP versions, bug fixes etc
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| 14:43 | <alkisg> fitzman: ltsp in ubuntu is usually broken without it...
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| 14:44 | tarzeau: no, not interested in maintaining a user manager outside of ltsp currently...
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| 15:06 | <alkisg> tarzeau: but, if such a good user manager existed, then ltsp-manager code would be a lot smaller :)
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