Maxim Dounin Wrote:
> Try "nginx -t". If it doesn't help, please post
> the full config
> you're testing with.
>

Hi,

Maxim, thank you for your response!

I've checked both servers for config errors before, but without any clues.


nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful



Current configuration:

***** cat /etc/nginx/nginx.conf

user nginx;
worker_processes 1;

error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;


events {
worker_connections 1024;
}


http {
include /etc/nginx/mime.types;
default_type application/octet-stream;

log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';

access_log /var/log/nginx/access.log main;

sendfile on;
#tcp_nopush on;

keepalive_timeout 5;

#gzip on;

include /etc/nginx/conf.d/*.conf;
}


***** cat /etc/nginx/conf.d/proxy.conf

log_format cache '$remote_addr $time_local '
'$upstream_cache_status '
'proxy_host:$proxy_host '
'Cache-Control:$upstream_http_cache_control '
'Expires:$upstream_http_expires '
'upstream_server:$upstream_addr '
'upstream_status:$upstream_status '
'"$request" ($status) '
'"$http_user_agent" ';



proxy_cache_path /home/mpqcache levels=1:2:2 keys_zone=mpqcache:30000m;

upstream mpq_cluster {
#ip_hash;
server otile1.mqcdn.com:80;
server otile2.mqcdn.com:80;
server otile3.mqcdn.com:80;
server otile4.mqcdn.com:80;
}

server {

listen 80;
server_name mpq1.XXX.com mpq2.XXX.com;

access_log /var/log/nginx/mpq1.XXX.com_access.log cache;
error_log /var/log/nginx/mpq1.XXX.com_error.log info;

location / {
#proxy_pass http://mpq_cluster;
proxy_pass http://otile1.mqcdn.com;
proxy_set_header Host otile1.mqcdn.com;
proxy_ignore_headers X-Accel-Expires Expires Cache-Control Set-Cookie;
proxy_cache mpqcache;
proxy_cache_key "$scheme$host$request_uri";
proxy_cache_valid 200 302 600h;
proxy_cache_valid any 90m;
}

} # server



***** sample headers from upstream server:

http://otile3.mqcdn.com/tiles/1.0.0/osm/15/5240/12661.jpg

GET /tiles/1.0.0/osm/15/5240/12661.jpg HTTP/1.1
Host: otile3.mqcdn.com
User-Agent: Mozilla/5.0 (Ubuntu; X11; Linux i686; rv:8.0) Gecko/20100101 Firefox/8.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en,en-us;q=0.7,pl;q=0.3
Accept-Encoding: gzip, deflate
Accept-Charset: ISO-8859-2,utf-8;q=0.7,*;q=0.7
Connection: keep-alive
If-Modified-Since: Tue, 13 Dec 2011 06:16:41 GMT

HTTP/1.1 304 Not Modified
Content-Type: image/jpeg
Expires: Fri, 16 Dec 2011 14:16:45 GMT
Last-Modified: Tue, 13 Dec 2011 06:16:41 GMT
Cache-Control: max-age=600
Date: Fri, 16 Dec 2011 14:06:45 GMT
Connection: keep-alive


***** sample headers from nginx proxy
http://mpq1.XXX.com/tiles/1.0.0/osm/15/5240/12661.jpg

GET /tiles/1.0.0/osm/15/5240/12661.jpg HTTP/1.1
Host: mpq1.XXX.com
User-Agent: Mozilla/5.0 (Ubuntu; X11; Linux i686; rv:8.0) Gecko/20100101 Firefox/8.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en,en-us;q=0.7,pl;q=0.3
Accept-Encoding: gzip, deflate
Accept-Charset: ISO-8859-2,utf-8;q=0.7,*;q=0.7
Connection: keep-alive
Cookie: bblastvisit=1323941196; bblastactivity=0; __qca=P0-811271075-1323941200190; __utma=26892847.397077741.1323941200.1323964564.1324035857.4; __utmz=26892847.1323941200.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); bbuserid=33280; bbpassword=be7f8ba39107f78fb42020ad76ca953b; __utmc=26892847; bbsessionhash=0d7cdd74637b9f503c4f33d7ad1f8394

HTTP/1.1 200 OK
Server: nginx/1.0.10
Date: Fri, 16 Dec 2011 14:08:43 GMT
Content-Type: image/jpeg
Connection: keep-alive
Expires: Wed, 14 Dec 2011 14:59:21 GMT
Last-Modified: Tue, 13 Dec 2011 06:16:41 GMT
Cache-Control: max-age=600
Content-Length: 18419





Thanks!


Regards,
P.