Dear Thorpe,
the commit [1] introduces more more log severity named "Debug(timeout)",
which causes - when switched on - the server to write timeout related
entries to the system log, such this can be used as well on busy servers.
Just turn it on with
ns_logctl severity Debug(timeout) on
(e.g. at the end of the config file, or via other means such as nsshell),
and it should lead you to the place where the problem occurs.
Hope, this helps
-g
[1]
https://bitbucket.org/naviserver/naviserver/commits/d1c8de59f417b833ff1a8b3b61bf1aea63ac5a94
On 11.03.20 17:39, THORPE MAYES via naviserver-devel wrote:
Gustaf,
Thank you very much for your response.
The server stands alone.
This has happened twice in the past 10 days. Never before for the last
20 years (unless I induced it).
I looked at the cpu usage, which tells me if we are in a never-ending
loop. All was well there.
I looked at the logs thinking that the event was related to something.
I cannot see any relationship.
I am just serving web pages built using tcl that utilize data
generated from a database. There is nothing I do that is sophisticated.
For the moment I am monitoring the issue. We will see what happens.
Again, thank you for your response (and your work on the naviserver
project).
Thorpe
On Mar 11, 2020, at 9:18 AM, Gustaf Neumann <neum...@wu.ac.at
<mailto:neum...@wu.ac.at>> wrote:
Dear Thorpe,
i just checked the source code, and found two situations, when the server
returns a 503 HTTP status:
a) The Tcl code issues a "ns_returnunavailable"
b) The Tcl-/ADP-request ends in a NS_TIMEOUT
I would exclude (a) for now. (b) can happen e.g. when
one uses NaviServer as a reverse proxy to some backend host,
but the backend host does not answer. We checked our logs
on the busy servers over the last weeks, but could trace the
few 503 errors to cases, where the backend server was rebooted.
it is possible to intensify the tracing of NaviServer in such cases,
but it would certainly be good to learn more about your
situation.... Can you check, if there is some unresponsible
backend server is involved in your case?
all the best
-g
On 10.03.20 20:12, THORPE MAYES via naviserver-devel wrote:
HI,
I am getting this error:
Service Unavailable
The server is temporarily unable to service your request. Please try
again later.
/NaviServer/4.99.19 on /
Restarting the server software fixes the issue, but I need a better
solution.
What causes this? How can I detect when the server is in this state?
Thank you,
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