Paul ROBINS wrote:
Hello,
I'm new here. Sorry if the answer to my questions exist somewhere in
the archives - I did search but couldn't find anything. Sorry this is
a bit long, I wanted to explain what I need as clearly as possible:
I have an intranet web server that allows our users to browse a
hierarchy of data files which represent graphs. On selecting a data
file the server runs a kind of cgi executable that transforms the file
into a graph image and serves it up in an html page. The executable is
ours and unfortunately cannot run without an X display to generate a
pixmap, which is where VNC comes in very handy :)
I'm currently just testing the whole thing using a single VNC server
on the webserver for all requests and it works - but what I want to
avoid is "graphical collisions" on the VNC server's display when
making the images, i.e. one users pixmap obscuring anothers. So
ideally I'd like to create a VNC server per user session. I'm using
PHP sessions by the way attribute session ids.
The problem I have is knowing when a particular VNC display is no
longer needed. I know when a user initially connects and requests an
image so I could at that point create a VNC server and register that
display as belonging to the session. The user would continue to
generate images on "his/her" server/display as long as their session
was open. As I said though I don't really know when the session ends
so I'd end up with an awful lot of inactive VNC servers running after
a short time :(
I could use inetd to run VNC, but that would bring up a server per
image request, which seems like a lot of stopping/starting to me ;)
and I guess would be slower. (a user may look at many tens of graphs
per session).
What I'd really like to do is have a users VNC server die quietly
after a defined period of inactivity but I can't find any option to do
this. I know this goes against the usual idea of keeping a VNC server
alive but for this kind of usage it would be a really handy!
This sure is a nice (ab) use of Xvnc!
If a sinlge user can use one Xvnc session, you can start an Xvnc for
each user or for each session. Your session IDs can be the $DISPLAY
values, however, best to keep the numbers below 64 or even 32 since the
display number relates to 2 or 3 ports: 6000, 5900 (and optionally 5800)
with added the display nummer.
ON the other hand, a different setup can be the use of the java-viewer:
Then the user gets the X display in the browser and in there the display
of the graphs. This nicely controlls the session however, be sure to
start the java-viewer readonly (if possible).
Success,
CBee
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