upstream expirou (110: Tempo limite da conexão esgotado) durante a leitura do cabeçalho de resposta do upstream

Question

Por algum motivo, estou recebendo este erro sempre que estou executando uma consulta no meu servidor. Na minha configuração local, essa consulta leva cerca de 7-8 segundos para retornar, mas continua excedendo o tempo no meu servidor real.

Erros:

2014/03/26 13:40:13 [error] 11084#0: *22 upstream timed out (110: Connection timed out) while reading response header from upstream, client: xxxxx, server: xxxx request: "GET /xxxxx/ HTTP/1.1", upstream: "uwsgi://unix:///srv/www/poka/app/poka/nginx/poka.sock", host: "xxxx"
2014/03/26 13:41:26 [error] 11084#0: *80 upstream timed out (110: Connection timed out) while reading response header from upstream, client: xxxxx, server: xxx, request: "GET /xxxxx/?format=json HTTP/1.1", upstream: "uwsgi://unix:///srv/www/poka/app/poka/nginx/poka.sock", host: "xxxx.$

Estou executando o Django / Nginx / uWSGI.

Aqui está o meu conf nginx:

# poka  _nginx.conf

# the upstream component nginx needs to connect to
upstream django {
    server unix:///srv/www/poka/app/poka/nginx/poka.sock; # for a file socket
}

# configuration of the server
server {
    # the port your site will be served on
    listen  443;

    ssl         on;
    ssl_certificate     /etc/xxx/xxx.pem;
    ssl_certificate_key /etc/xxx/xxx.key;


    # the domain name it will serve for
    server_name xxxx; # substitute your machine's IP address or FQDN
    charset     utf-8;

    # max upload size
    client_max_body_size 750M;   # adjust to taste

    # Finally, send all non-media requests to the Django server.
    location / {
        uwsgi_pass  django;
        include     /srv/www/poka/app/poka/nginx/uwsgi_params; # the uwsgi_params file you installed
    }
}

e aqui está o meu uWSGI conf:

master          = true
processes   = 2
socket          = /srv/www/poka/app/poka/nginx/poka.sock
chmod-socket    = 666
vacuum          = true

pidfile = /tmp/project-master.pid # create a pidfile
harakiri = 120 # respawn processes taking more than 20 seconds
max-requests = 5000 # respawn processes after serving 5000 requests
log-maxsize = 10000000
post-buffering=4096
logto = /var/log/uwsgi/poka.log # background the process & log