x2go-dev October 2010

x2go-dev@lists.x2go.org

19 participants
36 discussions

x2go slow response
by Alejandro Alberola 05 Oct '10

05 Oct '10

Hello, While testing x2go I have seen that the mouse latency is greater in x2go than in NX. For example, if I navigate with the mouse through the options of the gnome menu the response in x2go is slower than in NX. I am using the linux versions of the clients (x2goclient/nxclient) and I have configured the link speed with the same value (ADSL). Am I doing something wrong ? Thanks. --- Alejandro Alberola

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sudo permissions?
by Rob Lemley 05 Oct '10

05 Oct '10

Hey folks, I've been toying around with x2go a bit, and I'm really liking it. >From what I've seen, the overall architecture is cleaner than freenx and even neatx. Certainly none of that insanity of netcat's and fdcopy's. I was a rather disturbed by the x2goserver package adding a line in my sudoers file to allow anyone in the x2gousers group to run x2gopgwrapper as root. I checked out that script and the three scripts it can potentially call, x2gopgwrapper_{local,net,sqlite}. Other than the _net script I see no reason why root access is required. All these scripts do is access a database and run queries. The _net script as written probably needs root access, but there's no reason why with some permission adjustments on the postgres database server that it can't run unprivileged as well. As I'm just using sqlite on a single system, I did a little experiment and made some changes to run that script as an unprivileged user. I created an unprivileged x2go user with no password: (The defaults with this particular invocation of useradd are adequate, but the account can be restricted some more) useradd -r x2go So the sudoers entry becomes: #### X2GO section %x2gousers ALL=(x2go) NOPASSWD: /usr/bin/x2gopgwrapper Then permissions on the sqlite database need changing so our x2go user can run its queries: cd /var/db sudo chown -R x2go.x2go x2go Finally, the scripts in /usr/bin need to be changed so that x2gopgwrapper runs at x2go: for i in x2go*; do sed -ibak -e 's/sudo x2gopgwrapper/sudo -u x2go x2gopgwrapper/' $i; done I made these changes on my system and have not had any issues connecting. I am only using the x2goserver package at the moment; it's just this one script that gets executed as root, I don't know about any of the other packages. There's also the matter of the x2gocleansessions cleanup script... There's a couple of sudo calls in there as well, I didn't change that just yet as I've just disabled it altogether to prevent the spam it sends to my syslog. I apologize if this topic has been brought up before or is discussed in the documentation someplace; I looked around and didn't see anything. I simply bring this up in the interest of system security. The fewer things that run as root the better. The changes I describe above are my quick hack-n-fix. If I get a chance in the next few days I can throw together a proper fix and submit a patch. (And please add my vote to the yes-please git repository crowd.) X2go seems to have a lot of possibilities and potential. Thanks to Heinz and Alex for their hard work. ^_^ rob

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Strange authentication requests from x2goserver
by Hoefle Marco 04 Oct '10

04 Oct '10

Hello, I am evaluating the x2go tools as an alternative to vnc (I like especially the browser plugins). On the server (debian squeeze) I recognized that the x2goserver is periodically every 5 seconds doing this: srv03-lin:/srv/http/trac/umtsrouter# tail -F -n 10 /var/log/auth.log Oct 4 19:47:33 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:47:38 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:47:43 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:47:48 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:47:53 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:47:58 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:48:03 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:48:08 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:48:13 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:48:18 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin Oct 4 19:48:23 srv03-lin sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/bin/x2gopgwrapper listsessionsroot srv03-lin "/etc/init.d/x2goserver stop" will stop the authentication requests. Any Ideas what can cause this? On the client side I experienced other strange things, when having multiple sessions I get this on the x2go web plugin client (browser iceweasel 3.5.12): (the command update-manager was lauchched within a gnome xterm shell) hoefle@srv03-lin:~$ sudo update-manager [sudo] password for hoefle: Wrong Password [sudo] password for hoefle: Sorry, try again. [sudo] password for hoefle: Invalid MIT-MAGIC-COOKIE-1 key/usr/lib/pymodules/python2.6/gtk-2.0/gtk/__init__.py:57: GtkWarning: could not open display warnings.warn(str(e), _gtk.Warning) Invalid MIT-MAGIC-COOKIE-1 key[ ERROR:UpdateManager.BugHandler] No exception handler installed. Traceback (most recent call last): File "/usr/bin/update-manager", line 37, in <module> app = Application(APP_NAME, LOCALE_DIR, frontend='Gtk') File "/usr/lib/pymodules/python2.6/UpdateManager/Application.py", line 120, in __init__ self._load_frontend(frontend) File "/usr/lib/pymodules/python2.6/UpdateManager/Application.py", line 201, in _load_frontend "frontend", FrontendBase) File "/usr/lib/pymodules/python2.6/UpdateManager/Application.py", line 240, in _load_meta obj = symbol(*module_args, **module_kwargs) File "/usr/lib/pymodules/python2.6/UpdateManager/Frontend/Gtk/__init__.py", line 59, in __init__ gtk.init_check() RuntimeError: could not open display with vnc I can have multiple sessions without having any problems regarding display opening. I have a swiss-german keyboard layout and I have a key mismatch, it seem that I always get a german keylayout. Is eventually not every keymap implemented? Cheers, Marco

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BerliOS GIT perparations for X2go
by Mike Gabriel 03 Oct '10

03 Oct '10

Hi there, during the next week I will dive into GIT administration for X2go and prepare the new X2go GIT repository at BerliOS. Developers and contributors that are interested in collaboration may please join the BerliOS Developer portal and register an account there: https://developer.berlios.de/account/register.php If you are interested in your own X2go GIT branch, please send your BerliOS username and your preferred branch name to: git-admin (at) x2go (dot) org light+love, Mike -- DAS-NETZWERKTEAM mike gabriel, dorfstr. 27, 24245 barmissen fon: +49 (4302) 281418, fax: +49 (4302) 281419 mail: m.gabriel(a)das-netzwerkteam.de, http://das-netzwerkteam.de freeBusy: https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.x…

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Re: [X2go-dev] X2go-dev Digest, Vol 21, Issue 36
by brian mullan 02 Oct '10

02 Oct '10

I just read about this. Google has introduced and open sourced a new image format to help speed up the performance of websites called W*ebP*. - *WebP has a 40% improvement over JPEG and WebP was designed to improve the compression offered by JPEG*. - Google has created a site<http://code.google.com/speed/webp/gallery.html>for Web developers and users to assess the performance of WebP. - The images presented at the site show WebP side-by-side with JPEG images. The WebP images are 40 to 50 percent trimmer in bytes but look the same to the human eye. - *WebP is based on Google's VP8 codec that they also open-sourced recently. * VP8 is part of the heart of HTML 5's video capability. - To trim down file size for WebP, Google used an image compressor based on the VP8 codec that Google open-sourced in May 2010. My question for x2go developers is Could WebP (or VP8 codec itself) be implemented at both the x2go-server and the x2go-client and *possibly get a substantial improvement* in video performance ?? Currently x2go as most NX oriented solutions (Freenx, NoMachine NX) typically use JPEG for compression. But it seems to me that WebP could be implemented and as it is reported to be 40% more efficient than JPEG... less bytes means less network traffic and usually better/faster performance. Brian Mullan

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Python X2go rewrite from scratch, first drafts available online
by Mike Gabriel 01 Oct '10

01 Oct '10

Hi there, I would like to make you aware of the API documentation of the completely from scratch rewritten Python X2go library, now published under GPLv3. http://packages.das-netzwerkteam.de/doc/python-x2go/ There is a German project page on our website (we are thinking of translating the site into English, sorry for now for those who cannot read German): http://das-netzwerkteam.de/site/?q=node/71 The current Python X2go development can be followed at: https://svn.das-netzwerkteam.de/websvn/listing.php?repname=nwt-projects&pat… There are packages for Ubuntu Lucid available in our APT repository: deb http://packages.das-netzwerkteam.de/ubuntu lucid main Available packages are: python-x2go (incl. non-lucid dependencies like python-greenlet, python-gevent) pyhoca-cli python-x2go package notes: -------------------------- With Python X2go you will also need the x2goclient package from the X2go repository installed (because of nxproxy binary). Python X2go requires Python v2.6 or greater. NOTE: at this very moment I realize, that the example files in the package have not been adapted to the current API... this will come in a couple of days, so stay tuned... pyhoca-cli package notes: ------------------------- PyHoca-cli will become an X2go Client implemented in Python. Currently there is only graphics support available (no sound, no printing, no sshfs, no...). But it works on my Ubuntu lucid systems and maybe also on yours. After installation try pyhoca-cli --help or ,,man pyhoca-cli'' for further information. As you might guess... Python X2go is far away from being anything like unstable, testing or stable. It is purely experimental and actually freshly born. If you have ideas, feedbacks, bugs, patches, please let me know... AND: Do not even think about using Python X2go in productive scenarios during the next year or so. Developing stable software takes time!!! I'll be happy if any of you wishes to contribute. light+love, Mike -- DAS-NETZWERKTEAM mike gabriel, dorfstr. 27, 24245 barmissen fon: +49 (4302) 281418, fax: +49 (4302) 281419 mail: m.gabriel(a)das-netzwerkteam.de, http://das-netzwerkteam.de freeBusy: https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.x…

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x2go-dev October 2010