On Sat, Jun 14, 2014 at 10:43 AM, Arun Khan <knu...@gmail.com> wrote: > On Sat, Jun 14, 2014 at 6:06 AM, Shrinivasan T <tshriniva...@gmail.com> wrote: >> I have a GUI application to be run on a headless server, in cron >> periodically. > > I don't think this is possible. You *need* an X server to display. > Does your application work from CLI i.e. output on a console? > >> >> It runs well on local laptop in cron as I have logged in a GUI environment. >> >> Ex- >> >> 10 10 * * * display:0 firefox >> >> I have to run the same application on a remote server where I have SSH >> login as root. > > 'root' ? bad idea. FF can run as any user, as root you have the > full authority to create a regular user! > > Curious, where did the FF display come up? > >> The server has all the gnome and kde installed. >> >> But the GUI app is not running as I did not logged in GUI. > > Good. The libs must be on the headless server. > >> I don't know if the ctrl+F7 area has only gdm login screen or someuser has >> logged in already. > > It is 'CTL+ALT+Fn' to switch the VGA console of your headless system, > so how does this matter? > > Provide a use case scenario for a better understanding of what you are > trying to do. > >> Is there any way to login as GUI user remotely even no one logged in GUI >> locally ? > > Yes but It is necessary to understand how X windows works. In a X > desktop, the applications run as client and talk to it's X server over > a unix socket (in the early days, the X server also took connections > over the network but that is not the default setup. With headless > setup i.e. no X server running, you are out of luck. To me it does > not make sense to run firefox from a cron job to display on the same > headless server. > > On a remote desktop, you can try: > > (a) open up the X server to accept connections from the headless > server and program firefox at the headless server to display on this > desktop. I leave the mechanics of this for your research. Once > this works, accordingly modify your cron entry on the headless server. > Make sure there is another entry to kill this job, otherwise you will > have multiple displays
For the above method, minor clarification, it should read (a) open up the X server on the remote desktop to accept connections from the headless .............. With this method these links may work for what you want to achieve. <http://ubuntuforums.org/archive/index.php/t-105250.html> <http://forums.fedoraforum.org/showthread.php?t=286840> FWIW, I found the above links on the first page with search keywords 'executing X application via cron' -- Arun Khan _______________________________________________ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc ILUGC Mailing List Guidelines: http://ilugc.in/mailinglist-guidelines
