Hi, all!
I’ve stumbled upon a problem I can’t find a solution for many hours in a
row. I use nginx as a reverse proxy to python/spawning web-server. I’ve
done it for 1000 times already and all worked fine before this day.
Nginx on a server I’m talking about serves 3 separate projects
(hostnames) as a reverse proxy. I’ve added fourth. Three existing
projects continued to work perfectly. But the new one sometimes works
and sometimes returns 502.
The observation is: once it began to return 502 it would return it on
every browser refresh. However if I’ll throttle F5 fast, after 5-10
refreshes it starts to work properly. And vice versa: once it works like
it should, slow refreshes keep it working, but if I’d throttle F5 again
or if I’d wait for a minute or so nginx declines back to 502-state.
There is nothing recorded in neither log (access/error nginx/backend) if
it is in 502-state. The deal is not in a backend. I’ve tried to set
proxy_pass to the same value as in a sibling well-working project conf
and the same story repeats. Problem exists for static resources as well.
Is this conf cursed?
++++
user www-data;
worker_processes 1;
error_log /var/log/nginx/error.log debug;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
# multi_accept on;
}
http {
include /etc/nginx/mime.types;
access_log /var/log/nginx/access.log;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
tcp_nodelay on;
gzip on;
gzip_disable "MSIE [1-6]\.(?!.*SV1)";
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
/etc/nginx/sites-enabled/my-cursed-conf
server {
listen 80;
server_name hostname.iam.listening.to;
# Main location
location / {
proxy_pass http://127.0.0.1:8084;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location /static/ { alias /srv/some/path/static/; }
}
++++
I feel I’ve tried all combinations of buffer-tweaking and none of them
helped. The system has > 700 Mb or RAM free and mostly idle CPU. Could
someone guess what the hell is going on?
Posted at Nginx Forum: