Re: what could "use up" X forwarding connections?



On 10/03/2010 03:27 PM, Roberto Ragusa wrote:
Tom Horsley wrote:
Anyone have any clues about what could "use up" some resource
used to create a forwarded X connection (ssh -X)?

I've got these testbeds that run 24/7 on random collections
of both real and virtual machines, and they are all started
from inside a VNC session using ssh -X to get to the target
test machine. The theory is that any test which needs a X
server will be happy with the VNC server.

After running for a few months, tests sometime start failing
because they can't open the X server. Reboot the host (which
is running fedora 13) and recreate the VNC server and things
work again.

Seems like something is getting "used up" that the reboot
cleans up, but I haven't been able to find out what
that something is :-).
I saw something similar on fedora 13 some time ago.

Connections failing because the pseudo-file (Unix socket)
/tmp/.X11-unix
had been deleted for some reason.

In my case it was apparently a tmpwatch script cleaning
away something more than what it should have.

I never understood if the problem was with stuff from
Fedora 13 (atime, ctime, mtime flags to tmpwatch, effects of
relatime...) or from other vendors, as this machine has
additional proprietary software installed (including cronjobs).

It has been working for a few weeks now; maybe an update fixed it.
Not sure.
Hi Tom,
When the failure happens, in addition to checking the
/tmp/.X11-unix
socket, have you looked at memory?
top should tell you how much is available and how much is
used and by whom. If the socket is still there, and vnc fails
due to lack of a resource, it might be memory.
Many apps leak memory, and perhaps vnc is no exception.

Cheers,

JD
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