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2322 discussions

Long-running x2goagent, high memory usage
by Johannes Töger 28 Jan '20

28 Jan '20

Hi, We are using x2go for a common compute server at our department. We have users both on the local LAN and connections to the other side of Europe that work really well. Being able to close the client and have computations still running in a GUI environment is great. However, I think we have encountered a bug. Some (but not all) of the long-running x2goagent processes start taking a lot of memory, ~30 GB. This adds up quickly so that the other users can't do their work. Below you can see how user3 and user7 have x2goagent processes with large memory use (RSS column). How can I go about debugging this? I have quite a bit of Linux experience, but I don't know where to start on this one since I don't know much about how x2go works internally. Server is on Ubuntu Server 18.04.1 LTS, (x2goserver 4.1.0.3-0~1708~ubuntu18.04.1). Clients are on Windows 10, version. 4.1.2.0. johannes@compute-server:~$ ps -o pid,lstart,rss,user $(pgrep x2goagent) PID STARTED RSS USER 4668 Fri Nov 8 08:35:35 2019 60896 user1 5743 Wed Dec 4 15:44:41 2019 249456 user2 14728 Thu Dec 5 10:17:25 2019 34926120 user3 19408 Fri Dec 20 08:46:30 2019 199720 user4 48797 Wed Oct 2 15:34:44 2019 297680 user5 50693 Thu Dec 12 18:24:24 2019 317796 user6 54561 Thu Dec 19 09:35:34 2019 28977804 user7 56244 Fri Jan 17 08:19:29 2020 170856 user8 60386 Thu Nov 14 09:23:37 2019 146416 user9 johannes@compute-server:~$ apt show x2goserver Package: x2goserver Version: 4.1.0.3-0~1708~ubuntu18.04.1 - Johannes Töger Associate Senior Lecturer Cardiac MR Group Department of Clinical Sciences Lund, Clinical Physiology Lund University, Sweden

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info about multimonitor systems
by gian sisal 24 Jan '20

24 Jan '20

Hi everyone, I'm a newbie, I've installed x2go server on some multi-monitor machines and successfully accessed these machines. my x2go server version is: 4.1.0.3 I'm using x2go Windows client (4.1.2.0) to access these machines, I can see all active displays, but on my physical monitor I see them squeezed, in addition I can't see the mouse pointer. So my questions are: 1- is there a way to select a single active display from my client while trying to access a multi monitor machine? 2- is there some option to make the mouse pointer available and visible? Thanks a lot for your help! Regards.

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x2go: Unable to find free display port or insert new session into database (revisited)
by Jeff Sadowski 22 Jan '20

22 Jan '20

I found some good information here https://unix.stackexchange.com/questions/467507/x2go-unable-to-find-free-di… but "x2godbadmin --recreate" is not working for me. I removed every package I could think of that might be interfering and purged them (x2go*, xorg*, nvidia, cuda, xvfb, ...) then reinstalled with no luck any time I try and connect I get Unable to find free display port or insert new session into database message. I am using ubuntu 16.04 I can not find what is preventing it on this one system. How can I enable more debugging so I can figure out what is going wrong? Jan 21 16:12:46 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 1). Jan 21 16:12:47 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 2). Jan 21 16:12:48 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 3). Jan 21 16:12:49 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 4). Jan 21 16:12:50 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 5). Jan 21 16:12:50 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 6). Jan 21 16:12:51 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 7). Jan 21 16:12:52 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 8). Jan 21 16:12:53 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 9). Jan 21 16:12:54 euler /usr/bin/x2gostartagent: unable to insert display port into database. Retrying (run 10). Jan 21 16:12:54 euler /usr/bin/x2gostartagent: Unable to find free display port or insert new session into database; parameters: port (51), hostname (euler) and session name (jsadowski-51-1579648373_stDXFCE_dp24). It seems I am missing a package or more and I can not figure out which ones.

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x2gobroker with broker-session-autologin: client tries to login with local username instead of given one
by Martin Lange 21 Jan '20

21 Jan '20

Hello, I am trying to configure the x2gobroker to do key-based login to the servers after sucessfull authentication against the broker. Everything looks fine, except the client. It tries to login with the correct key, but a wrong username. It uses the username from the local machine. e.g. - On my local machine, I am logged in as user "martin" - start the client with --broker-url=http://192.168.0.1:8080/plain/inifile/ - successfully authenticate with the username "udo" and a password against the broker - select the session -> login failed, so I do some research and the auth.log of the remote machine shows that I try to login with the broker-generated key, but the username "martin" instead of "udo" the profile in x2gobroker-sessionprofiles.conf: [TEST] user= host=pegbar1 (192.168.0.1) name=TEST command=KDE fullscreen = true broker-session-autologin=true broker-use-load-checker=true broker-authorized-keys=%h/.x2go/authorized_keys /var/log/x2gobroker/broker.log shows the key generation for user "udo": 2020-01-20 12:14:21,249 - broker - DEBUG - base_broker.X2GoBroker.get_authorized_keys_file(): found broker-authorized-keys in session profile with ID TEST: %h/.x2go/authorized_keys. This one has precendence over the default value. 2020-01-20 12:14:21,317 - broker - INFO - Executing agent command on remote host pegbar1 (192.168.0.1): sh -c '/usr/lib/x2go/x2gobroker-agent udo addauthkey "no-X11-forwarding,no-pty,no-user-rc ssh-rsa [***] udo(a)192.168.0.40" "%h/.x2go/authorized_keys"' 2020-01-20 12:14:21,462 - broker - INFO - Broker agent answered: OK; 2020-01-20 12:14:21,463 - broker - DEBUG - base_broker.X2GoBroker.get_authorized_keys_file(): found broker-authorized-keys in session profile with ID TEST: %h/.x2go/authorized_keys. This one has precendence over the default value. 2020-01-20 12:14:21,465 - broker - DEBUG - Scheduled deletion of authorized key in 20s: user=udo, hostname=pegbar1, hostaddr=192.168.0.1 2020-01-20 12:14:41,569 - broker - INFO - Executing agent command on remote host pegbar1 (192.168.0.1): sh -c '/usr/lib/x2go/x2gobroker-agent udo delauthkey "no-X11-forwarding,no-pty,no-user-rc ssh-rsa [***] udo(a)192.168.0.40" "%h/.x2go/authorized_keys"' 2020-01-20 12:14:41,712 - broker - INFO - Broker agent answered: OK; /var/log/auth.log shows the failed login for user "martin": Jan 20 12:14:21 pegbar1 sshd[7131]: debug1: trying public key file /home/martin/.x2go/authorized_keys Jan 20 12:14:21 pegbar1 sshd[7131]: debug1: fd 4 clearing O_NONBLOCK Jan 20 12:14:21 pegbar1 sshd[7131]: debug1: restore_uid: 0/0 Jan 20 12:14:21 pegbar1 sshd[7131]: Failed publickey for martin from 192.168.0.40 port 57732 ssh2: RSA SHA256:*** Am I missing some configuration or this this a (known?) bug in x2goclient? Thank you very much and best regards, Martin

1 1

Connection Failed:
by Neal Becker 02 Jan '20

02 Jan '20

On a long-running session that I've been connecting to / disconnecting for many times, this morning I'm getting the attached error message. Despite the error message, the x2go session seems to still be working. This is Fedora 31 linux client + server. x2goclient-4.1.2.1-4.fc31.x86_64

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How to run a script that needs a terminal initially but is then a GUI (as a single application)?
by Chris Green 29 Dec '19

29 Dec '19

I discovered x2go a year or so ago and I'm finding it very useful, thank you! :-) I'm running x2go client on an xubuntu 19.04 system and the server on an xubuntu 19.10 system. I have a short script on the server system which first runs encfs to create a file system and it then runs a GUI that uses the file system just created. How can I run this as a 'Single application' in x2go? The script is called 'digimax', I have tried running a terminal as the single application by putting the following command into x2go:- xfce4-terminal -x /home/chris/bin/digimax This successfully asks for the encfs password in the terminal window that appears but it then just disappears and no GUI app follows. The script /home/chris/bin/digimax works perfectly when run locally in a terminal window. Is there any way I can get x2go to run this for me as a single application? -- Chris Green

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X2Go, Debian, Openbox - How run graphical clients as a simple user
by Lmhelp1 27 Dec '19

27 Dec '19

Hello, I am using X2Go under Debian with Openbox. I have upgraded to Debian Buster, I didn't use to experiment the problem below with Debian Stretch. My problem is about running graphical clients (like xeyes, xterm, gvim, etc.) from a console logged in either as a "simple" user ("user_2" below) or as "root". "user_2" cannot run these clients, "root" can. I would like both of them to be able to run these clients. Below, is what happens ("user_1" is the user that started the X2Go session, it is also a "simple" user). user_1> su user_2 Password: No protocol specified xrdb: Resource temporarily unavailable xrdb: Can't open display ':50' user_2> exit user_1> su Password: root> xeyes <OK> Can you tell me how to allow "user_1" to run graphical clients like xeyes, xterm, gvim, etc.? Best regards, -- Léa

3 4

Access Win10 with RDP from x2go client
by olafs6＠gmx.de 21 Dec '19

21 Dec '19

Hi! How can I access Windows 10 Pro with RDP from the X2go client (4.0.1.1)? My attempts always end with the message "ERROR: recv: Connection reset by peer" Bye, Olaf

1 0

New (unofficial) openSUSE packages available
by Tristan Miller 16 Dec '19

16 Dec '19

Greetings. The official X2Go RPMs for openSUSE have been broken or missing for many months. (See Bugs 1358, 1360, 1403, and 1427, as well as numerous problem reports on this mailing list over the past year.) Essentially it is no longer possible to install X2Go on openSUSE Leap and openSUSE Tumbleweed using the RPMs provided by X2Go. (And if you happen to have X2Go already installed, it is not possible to upgrade your openSUSE system without removing X2Go.) I suppose the developers are too busy to fix this problem, so I have built openSUSE RPMs of x2goclient, x2goserver, and pinentry-x2go myself using the latest SCM versions: openSUSE Leap 15.1 packages for x86_64: <https://download.opensuse.org/repositories/home:/psych0naut:/x2go/openSUSE_…> openSUSE Tumbleweed packages for i586 and x86_64: <https://download.opensuse.org/repositories/home:/psych0naut:/x2go/openSUSE_…> I have not contributed packages for openSUSE Leap 15.0 as that distribution reached end of life earlier this month. However, if anyone really needs those packages, let me know and I can see if I can get the openSUSE Build Service to produce them. Similarly, if anyone needs any other X2Go packages for openSUSE Leap 15.1/Tumbleweed, let me know and I may be able to contribute these as well. Note that I do not have any sort of automated system in place for keeping these builds in sync with the latest commits to X2Go. I consider my builds to be a stopgap measure until the X2Go developers fix their own nightly build system. Regards, Tristan [1] <http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=1358> [2] <http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=1360> [3] <http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=1403> [4] <http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=1427> -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Tristan Miller Free Software developer, ferret herder, logologist https://logological.org/ =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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Cursor key mappings sometimes break on reconnect
by Hanno Foest 10 Dec '19

10 Dec '19

Hello, I currently have the problem that my long-running x2go session works just fine, but after several weeks the cursor key mappings are suddenly garbled after re-connecting the session, and stay that way. The only way to "fix" the issue seems to be restarting it. Right now only cursor down works, and does the same thing as the Enter key. Cursor up, left and right are without function. I had a similar issue for at least 2 years before, where the Del key stopped working. That scenario seems to have been replaced by the one with the cursor keys for the last few months. (I'm just noticing that there seem to be even more issues - the Del key is now Print, and AltGr beeps. Usually I restart the session very soon, because it's not good to work with a misbehaving keyboard, so I didn't notice these before.) I *think* the problems start when re-connecting the session takes a few seconds longer than usually, but it's hard to tell because the issue happens rarely and infrequently. remote: Ubuntu 16.04.6 LTS x2goserver 4.1.0.3-0~1708~ubuntu16.04.1 local: Devuan GNU/Linux 2.1 (ascii) x2goclient 4.1.2.1-0x2go1+git20180626.1801+8.main.1 Redefining the keyboard settings with setxkbmap does not help. Output from xmodmap -pk with or without the issue present doesn't show a difference. xev -even keyboard has some interesting output though, see https://pastebin.com/kKEgeSDB And indeed, my AltGr key now works as cursor left, as far my current x2go session is concerned. I would be happy if someone had an idea how to reset my key mappings without restarting the session. But if I could help debugging the issue for good, that would be nice, too :) Hanno

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