[mapserver-users] Problem to use mapserver as fcgi with spawn-fcgi
and nginx - Process exit after each request
Guillaume Chanaud
guillaume.chanaud at connecting-nature.com
Mon Aug 17 14:48:27 EDT 2009
Hello everybody,
I'm trying to setup mapserver running as Fast-CGI with Nginx webserver.
I don't know if my problem comes from mapserver ot spawn-fcgi (or
nginx), but i'm pretty sure it's mapserver's fault because nginx and
spawn-fcgi works well with lots of other FCGI.
I use the spawn-fcgi script from lighttpd (here :
http://redmine.lighttpd.net/projects/spawn-fcgi/news ) with a personnal
init script
My process are running ok, like it does with php5-cgi for example
My nginx is configure to pass every request to *.cgi to the mapserver
fcgi instance, so every call to something.cgi works like a charm and
mapserver process the query and return back what i'm asking for. I did
the test with the sample data and tutorial and everything is ok.
But :
My fast cgi process process only one request and then die !
Passing things by TCP or socket doesn't change anything. If i spawn 5
forks, each fork will handle one request and then die, so i can handle
five request and then mapserver disapear from my system memory.
It works like a charm with php5-cgi (which is fcgi) and the process
doesn't die. I only change the process to be spawned to mapserver
instead of php5-cgi, and you know what ? Only one request and die...
I compiled mapserver with the --with-fcgi option, and everything is ok
for the ./configure
I managed to debug the mapserver fcgi communication with fcgi-debug
utilities (http://cgit.stbuehler.de/gitosis/fcgi-debug/)
Here is the dump of what i get :
---------------------------------------------------------------------------------------------------------------------------------------
vnode004:/usr/local/nginx/conf# spawn-fcgi -s /var/run/mapserver.socket
-n -u nobody -- /usr/local/bin/fcgi-debug /usr/local/bin/mapserv
new connection
(0)
begin request from webserver (0, 1): role: FCGI_RESPONDER, flags:
none
param from webserver (0, 1): 'QUERY_STRING' =
''
param from webserver (0, 1): 'REQUEST_METHOD' =
'GET'
param from webserver (0, 1): 'CONTENT_TYPE' =
''
param from webserver (0, 1): 'CONTENT_LENGTH' =
''
param from webserver (0, 1): 'SCRIPT_NAME' =
'/cgi-bin/mapserv'
param from webserver (0, 1): 'REQUEST_URI' =
'/cgi-bin/mapserv'
param from webserver (0, 1): 'DOCUMENT_URI' =
'/cgi-bin/mapserv'
param from webserver (0, 1): 'DOCUMENT_ROOT' =
'/usr/local/nginx/html'
param from webserver (0, 1): 'SERVER_PROTOCOL' =
'HTTP/1.1'
param from webserver (0, 1): 'GATEWAY_INTERFACE' =
'CGI/1.1'
param from webserver (0, 1): 'SERVER_SOFTWARE' =
'nginx/0.7.61'
param from webserver (0, 1): 'REMOTE_ADDR' =
'90.45.64.64'
param from webserver (0, 1): 'REMOTE_PORT' =
'32938'
param from webserver (0, 1): 'SERVER_ADDR' =
'192.168.100.4'
param from webserver (0, 1): 'SERVER_PORT' =
'8000'
param from webserver (0, 1): 'SERVER_NAME' =
'mapserver.connecting-nature.com'
param from webserver (0, 1): 'REDIRECT_STATUS' =
'200'
param from webserver (0, 1): 'SCRIPT_FILENAME' =
'/usr/local/nginx/html/cgi-bin/mapserv'
param from webserver (0, 1): 'HTTP_HOST' =
'mapserver.connecting-nature.com:8000'
param from webserver (0, 1): 'HTTP_USER_AGENT' = 'Mozilla/5.0 (X11; U;
Linux i686 (x86_64); fr; rv:1.9.1.1) Gecko/20090715 Firefox/3.5.1'
param from webserver (0, 1): 'HTTP_ACCEPT' =
'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'
param from webserver (0, 1): 'HTTP_ACCEPT_LANGUAGE' =
'fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3'
param from webserver (0, 1): 'HTTP_ACCEPT_ENCODING' =
'gzip,deflate'
param from webserver (0, 1): 'HTTP_ACCEPT_CHARSET' =
'ISO-8859-1,utf-8;q=0.7,*;q=0.7'
param from webserver (0, 1): 'HTTP_KEEP_ALIVE' =
'300'
param from webserver (0, 1): 'HTTP_CONNECTION' =
'keep-alive'
params end from webserver (0,
1)
stdin closed from webserver (0,
1)
stdout from application (0, 1): Content-type:
text/html\n
stdout from application (0, 1):
\n
stdout from application (0, 1): No query information to decode.
QUERY_STRING is set, but empty.\n
stdout closed from application (0,
1)
end request from application (0, 1): applicationStatus: 0,
protocolStatus:
FCGI_REQUEST_COMPLETE
connection closed
(0)
** Message: process 5975 exited with status
256
** Message: exit fcgi-debug
---------------------------------------------------------------------------------------------------------------------------------------------
As you can see, after the request i get a "** Message: process 5975
exited with status 25".
In a php5-cgi debug session, i don't have this and after "connection
closed (0)" the process is just waiting to handle another request.
What am i missing ? Is this the normal behavior of mapserver as fcgi (So
we are stuck to apache fcgi process manager ?) ?!
Sorry if this post is too long or messy, i tried to figure things out as
clear as possible. I can attach my nginx configuration file next time is
somebody needs it.
(the spawn-fcgi is launched like this :
spawn-fcgi -s /var/run/mapserver.socket -n -u nobody --
/usr/local/bin/mapserv
or
spawn-fcgi -a 127.0.0.1 -p 9000 -u nobody -- /usr/local/bin/fcgi-debug
/usr/local/bin/mapserv
)
And for those who wants to quick reply "Why don't you just use Apache
instead of Nginx", i have just lots of reason to become completly insane
by trying mapserver+nginx (or : i have lots of professional reason to do
this, even if it make me crazy)
Thanks a lot for those who can help me on this !
Guillaume Chanaud
More information about the mapserver-users
mailing list