nginx dies after a few minutes (unicorn)

[Stanley Sh]

I am running unicorn behind nginx to host Rails 3

Both nginx and unicorn run flawlessly when first started but nginx dies
inexplicably about 5-10 minutes later. Unicorn, however, stays up and is
still accessible through its own port.

Here is my nginx configuration pertaining to this application:


upstream unicorn {
    server unix:/tmp/.sock fail_timeout=0;
}

server {
    server_name example.com;
    root /www/example.com/current/public;

    keepalive_timeout 5;

    location / {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_redirect off;
        if (!-f $request_filename) {
            proxy_pass http://unicorn;
            break;
        }
    }
}

I have nginx's error_log enabled with the debug flag but there are few
clues in the error log file:

2010/08/04 19:34:59 [info] 20254#0: *4 client 98.173.61.21 closed
keepalive connection
2010/08/04 19:34:59 [info] 20254#0: *5 client 98.173.61.21 closed
keepalive connection
2010/08/04 19:35:17 [info] 20254#0: *8 client 98.173.61.21 closed
keepalive connection
2010/08/04 19:35:17 [info] 20254#0: *9 client 98.173.61.21 closed
keepalive connection
2010/08/04 19:35:18 [info] 20254#0: *10 client 98.173.61.21 closed
keepalive connection
2010/08/04 19:35:18 [info] 20254#0: *11 client 98.173.61.21 closed
keepalive connection
2010/08/04 19:35:18 [info] 20254#0: *12 client 98.173.61.21 closed
keepalive connection
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