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2315 discussions

x2go TCE ip of clients
by ECF Solutions 28 Jul '16

28 Jul '16

Hello again, I have a server (UBUNTU 14.04) and a TCE with several thinclients. They are connected to the server by a separate network and get their IPs from the DHCP running on the (pxe)server. I know - on the server - to get the names of the (via x2go) logged in users but I need the IP address of the thinclient as well - means e.g.: bert - 192.168.0.50 eve - 192.168.0.51 a.s.o. Is there a (simple) way to get this info? No, I can't work with static IPs for the clients and my users are not always using the same client ... Thanks for any hint. Christian

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Send message to all x2go-users logged in
by ECF Solutions 27 Jul '16

27 Jul '16

Hello everybody, my scenario: in my company 6 colleagues are working in the same office building as I am and 2 are only working from their home office. We are all using the same server placed "out of sight" in an other building and are connected via x2go (TCE in the office) to the server. The server (running UBUNTU 14.04) is protected against power loss by an ups that is monitored via usb and NUT on the server. The problem is to send messages regarding critical conditions (e.g. power loss) to all - via x2go - connected users. This is necessary because the NUT NOTIFYCMD script starts a controlled shutdown sequence (putting several running virtual machines to safestate a.s.o. and finally shutting down the server) after 3 minutes running on battery. These messages are send by nut via wall automatically but this is not the way as none of the users has open a terminal - all are working under their LXDE/OpenBox GUI. I asked the internet but only found one hint - and I have to say thanks to Timotheus Pokorra <https://www.blogger.com/profile/05259914906217943114> who gave me the direction with his post: http://tpokorra.blogspot.de/2013/07/notify-all-users-logged-in-over-x2go-on… I tested this and it did not work - so I designed the following solution: (this will be a /THE part of the notifycmd script from nut) #!/bin/bash # # NUT NOTIFYCMD script PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/sbin:/usr/local/bin # ... #if [ "$NOTIFYTYPE" = "ONBATT" ] #then # compose message for wall message="$(date "+%d.%m.%Y - %H:%M:%S ")$(cat /usr/local/bin/eam01.txt)" echo $message | wall # send message to admin by e-mail echo 'EAM - '$HOSTNAME' - '$(date)' Benutzer: '$USER 'USV meldet STROMAUSFALL / ONBATT !' | mail -s 'EAM from'$HOSTNAME admin(a)xxxxx.xx # get infos for x2go-user-information benutzer=`ps xaf | grep x2goagent | grep -v grep | awk ' { print ( $(NF-2) ) }' FS='-'` # get the user names screens=`ps xaf | grep x2goagent | grep -v grep | awk ' { print ( $(NF-1) ) }' FS='-'` # get the user displays USERCOUNT="$(echo $benutzer | wc -w)" # number of users / loops # start loop / action for every logged in x2go-user START=1 i=$START while [[ $i -le $USERCOUNT ]] do user=`echo $benutzer | awk -v a=$i '{print $a}'` # transfer contents (word 1,2,3...) of $benutzer to $user display=":"`echo $screens | awk -v a=$i '{print $a}'`".0" # compose $display (word 1,2,3... from $screens)) ":" & number from $screens & ".0" # send message to each x2go-user sudo -u $user -S -H sh -c "zenity --text-info --html --display=$display --filename=/usr/local/bin/eam01.txt" </usr/local/bin/pw.txt & ((i = i + 1)) done ## Loop with one second interval to allow SIGTERM reception. #let "n = 180" #while [ $n -ne 0 ] #do # sleep 1 # let "n--" #done #echo $0: commencing shutdown | wall # upsmon -c fsd #fi I know that regarding the safety questions it is not ok to read a sudo password from a file ... we must not discuss this - but I would be glad for any better idea - btw I know the possibilities of changes in the sudoers file but don't want this at the moment. As messages I use text files because this gives me the possibility (with zenity) to use html and the users finally see this popup: If someone is interested please feel free to use and test it. I would be very much interested if someone has a better / simple solution or would be thankful for every hint regarding the improvement of the code. For the time being I tested this not within the notifycmd script - I tested the interesting parts in a separate script (simulating the notifycmd / notifytype condition) within a test environment. My life-system-test has to wait until the weekend... Best regards Christian

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vnc server on X2Go Thin Client Environment for support
by Nobody is Perfekt 22 Jul '16

22 Jul '16

Hello all, I need to implement avnc server X2Go Thin Client Environment How can i do that ? X11VNC is nstalled on TCE and then ? Thanks a lot for hints,

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x2go hang on CentOS7
by Chris C 22 Jul '16

22 Jul '16

Hi, I've used x2go on a number of systems without problem in the past, however on a CentOS7 server running SSSD to provide AD authentication I'm seeing clients (both Windows and Linux) just hang when trying to connect. Turning on debugging, it just looks to be looping through: Jul 22 08:39:21 login02 /usr/lib64/x2go/x2gogetdisplays[ db_getdisplays called, server: login02; return value: Jul 22 08:39:21 login02 /usr/lib64/x2go/x2gogetdisplays[ db_getdisplays called, server: login02; return value: Jul 22 08:39:21 login02 /usr/lib64/x2go/x2gogetdisplays[ db_getdisplays called, server: login02; return value: Jul 22 08:39:21 login02 /usr/lib64/x2go/x2gogetports[116 db_getports called, server: login02; return value: Jul 22 08:39:21 login02 /usr/lib64/x2go/x2gogetports[116 db_getports called, server: login02; return value: Jul 22 08:39:21 login02 /usr/lib64/x2go/x2gogetports[116 db_getports called, server: login02; return value: This smells of a known bug (http://bugs.x2go.org/cgi-bin/bugreport.cgi? bug=688) which should be resolved in the version I'm using: x2goserver-4.0.1.19-6.el7.x86_64 I'm not actually trying to launch a desktop, only trying to run xterm. Am I missing something obvious here? Any ideas would be appreciated! Cheers, Chris

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Fwd: [X2Go-Dev] Bug#1058: Option to force new session when suspended session is present
by Mihai Moldovan 19 Jul '16

19 Jul '16

Forwarding to x2go-user, because this is essentially a user-related issue and depends on personal preference/workflow. -------- Forwarded Message -------- Subject: [X2Go-Dev] Bug#1058: Option to force new session when suspended session is present Resent-Date: Sat, 09 Jul 2016 07:35:02 +0000 Resent-From: Stefan Baur <x2go-ml-1(a)baur-itcs.de> Resent-To: x2go-dev(a)lists.x2go.org Resent-CC: X2Go Developers <x2go-dev(a)lists.x2go.org> Date: Sat, 9 Jul 2016 09:25:03 +0200 From: Stefan Baur <x2go-ml-1(a)baur-itcs.de> Reply-To: Stefan Baur <x2go-ml-1(a)baur-itcs.de>, 1058(a)bugs.x2go.org To: submit(a)bugs.x2go.org package: x2goclient priority: wishlist Hi, currently, when a suspended session is present and the parameters match the ones specified on the connection that is about to be established, it is silently assumed that a reconnect should take place. We are thinking how this could be changed in a way that doesn't break the current expected behavior, yet still allows forcing a new session in parallel to the suspended one. Possible options: Adding ... - a command line parameter - a per-session setting - a global setting - some hack like - right-clicking the tile - right-clicking the OK button - an option in the pull-down menu of the tile ... to enforce a parallel connection when desired. The solution we would currently prefer is: - *always* show the reconnect dialog when a suspended session is present - *if* there is exactly one matching session - preselect it - add a countdown timer to the OK button - once the countdown hits 0, pretend OK was pressed, and resume the session - any click anywhere else aborts the countdown - make 15 seconds the default value for the countdown - add a global parameter (CLI and GUI) to set it to another value (0 equals "never assume reconnect") - add command line options --always-assume-reconnect and --never-assume-reconnect (alternatively, allow -1 for the global parameter and treat that as "always assume reconnect", and forget these two command line options) Does anyone else have suggestions regarding this? We have a customer willing to pay for improvements here, but would like to channel the wisdom of the masses before implementing it. Maybe someone has an idea that would be even better? Kind Regards, Stefan Baur -- BAUR-ITCS UG (haftungsbeschränkt) Geschäftsführer: Stefan Baur Eichenäckerweg 10, 89081 Ulm | Registergericht Ulm, HRB 724364 Fon/Fax 0731 40 34 66-36/-35 | USt-IdNr.: DE268653243 _______________________________________________ x2go-dev mailing list x2go-dev(a)lists.x2go.org http://lists.x2go.org/listinfo/x2go-dev

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x2goclient & SLITAZ 4.0 / 5.0
by ECF Solutions 17 Jul '16

17 Jul '16

Hello all, I don't know if someone knows SLITAZ (http://www.slitaz.org/en/) - it's an extreme small Linux OS build from scratch but with similarities to Debian / Ubuntu. It has it's own package manager but it is possible to convert .deb packages to SLITAZ-packages. I did this with - x2goclient_4.0.1.1-1~bpo7+1_i386.deb I could install this package and everything is looking fine - but: When I start a connection it is build up but than immediately closed. In the (background-) terminal I get the following messages: tux@slitaz:~$ x2goclient x2goclient: /usr/lib/libldap_r-2.4.so.2: no version information available (required by x2goclient) x2go-INFO-1> "Starting x2goclient..." x2go-INFO-4> "Übersetzung: :/x2goclient_de_de installiert." x2go-INFO-5> "Übersetzung: :/qt_de_DE installiert." x2go-INFO-3> "X2Go Client ist gestartet." x2go-INFO-8> "Verbindung mit Server wird gestartet: xxxx.xxx.xx.xxx:22" x2go-INFO-6> "X2Go Client wird geschossen..." x2go-INFO-7> "X2Go Client wurde geschlossen." tux@slitaz:~$ With success I tested the following: - enabled trusted x11 forwarding (|ForwardX11Trusted yes ForwardX11 yes)| - connect via ssh -X to the server - works - start via ssh -X e.g. gimp on the server - works To the same server I can connect via x2goclient from e.g. an Xubuntu 14.04 Laptop without any problems - so from my point of view it can't be a server issue ... Any hints please - regards Christian

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x2go with SSH two-factor authentication
by Daniel Lo Nigro 17 Jul '16

17 Jul '16

Hi! My employer use two-factor authentication via Yubikey. Whenever I SSH to my development server, I use Kerberos to authenticate, and then it prompts for a Yubikey or Duo code. If I try to connect via the X2Go client, I get a message like this: Authentication failed. Check your GSSApi configuration or choose another authentication method. Checking the logs on the server, it looks like Kerberos auth is successful, but then X2Go is disconnecting once it receives the keyboard-interactive auth request. I managed to get it working using a super hacky method: I connect to my server via my regular SSH client, and forward some random port (eg. 1234) to localhost:22. Then I connect to localhost:1234 in X2Go, essentially tunneling a new SSH connection over the existing SSH connection. The server is configured to allow local connections to bypass two-factor auth, so this works around the issue in X2Go. It seems silly to tunnel SSH over SSH though. Any ideas on how to get this working properly with X2Go? It looks like Paramiko supports this configuration: https://github.com/paramiko/paramiko/pull/467 Thanks!

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X2go extension questions
by Karres, Dean 17 Jul '16

17 Jul '16

Hi, I am running x2go client 4.0.5.1 on a windows machine and connecting to a RedHat rhel 6 machine using x2go from the default yum repo. I am trying to create custom extensions for our local needs but am having some issues. Documentation is rather light on this so I hope you guys can shed some light? First, in the "fail" modalities: are these critical failures? Does the X2Go session in question survive a failure state? Next, I have written very simple extension shell scripts that just write the result of the "x2golistsessions" command to syslog and have put these extensions in each of the modality dirs. I have noticed that the "pre" & "post" "start" scripts do NOT report the process ID of the active session - the is an x2go "sessionID" but not a PID. When is the PID assigned? I have done a quick search through the source but it didn't jump out at me. Lastly, as mentioned above, I most often connect to a linux box from a windows desktop. I have had occasion to have the desktop -> linux connection going and then connect from a windows laptop into the same linux machine at the same time and as the same username. The two connections seem to get merged/confused. Is this normal? Dean...K...

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problem with x2goagent and Sysv5 shared memory segments
by Grigory Shamov 14 Jul '16

14 Jul '16

Hi All, We have encountered a strange problem: x2goagent on the server would eat up all the System5 shared memory segments when running a particular Java GUI application. After that any other processes doing shared memory would naturally fail. When the user connects, everything is as usual; then when Java program is opened and starts working (dataset is loaded, some graphics based on it displayed, several threads started to process the data) it quickly uses over 4K of the shared memory segments. In the output 'lsof -u user' there is about 4K lines of the sort: x2goagent 29374 auser DEL REG 0,4 402984941 /SYSV00000000 x2goagent 29374 auser DEL REG 0,4 403017710 /SYSV00000000 x2goagent 29374 auser DEL REG 0,4 403050479 /SYSV00000000 In Œipcs¹ output there is about 4K lines of this sort: ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 339708005 auser 600 4331520 1 dest 0x00000000 339740774 auser 600 4331520 1 dest 0x00000000 339773543 auser 600 4331520 1 dest The application is https://www.broadinstitute.org/igv/ Could you please advise, what causes this behaviour and what to do? The server¹s OS is CentOS 6, I am using X2go packages from EPEL, and the desktop the user uses is GNOME. Thank you very much in advance! -- Grigory Shamov Westgrid/ComputeCanada Site Lead University of Manitoba E2-588 EITC Building, (204) 474-9625

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Problems with Clipman in Ubuntu 14.04
by ECF Solutions 12 Jul '16

12 Jul '16

Hello everyone, I have a server running Ubuntu 14.04.4 LTS (GNU/Linux 4.2.0-41-generic x86_64) with XFCE4 desktop and LTSP for my ThinClients. When logged into the server via ThinClient / LTSP the Clipman-Plugin in the XFCE panel is working as expected. When I connect to this server via x2go (same user and tried it with different users) everything is working fine (sound / usb etc.) BUT not the Clipman-plugin. It's light grey and if I copy something this is not transferred to the clipman (copy and paste works but I have no history - the benefit of the plugin ...). I tried it with parcellite as well as clipit, glipper its always the same and I absolutely need this feature ... Does somebody know this problem / has a hint? Regards Christian -- C. Fraesdorff Ludwigsruher Str. 14 - 74582 Gerabronn Tel.: 07952 / 92 13 14 - Mobil: 0171 / 14 13 116 Mail: ecf(a)ecfsolutions.de

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