RoR - nginx issue when trying to deploy with unicorn - ruby-on-rails

Question

I'm beginner in Ruby on Rails and have some difficulties to deploy my rails application (with nginx + unicorn). I don't know what's going on, but here is the kind of errors I get in log files when I launch nginx :
2013/04/14 00:31:42 [error] 14469#0: *1 connect() to unix:/home/user/www/sahitoo/shared/sockets/unicorn.sock
**failed (111: Connection refused)** while connecting to upstream, client: XX.XXX.XX.XX, server: myapp.com,
request: "GET / HTTP/1.1", upstream: "http://unix:/home/user/www/sahitoo/shared/sockets/unicorn.sock:/",
host: "www.XXXXX.com"
If you could help to find out the problem, or at least give me some advices to track it, that would be very nice !!
Thanks a lot.
I also post nginx.conf file :
user www-data;
worker_processes 4;
pid /var/run/nginx.pid;
events {
worker_connections 768;
multi_accept on;
}
http {
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
gzip on;
gzip_disable "msie6";
gzip_http_version 1.1;
gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
upstream sahitoo {
server unix:/home/kar/www/sahitoo/shared/sockets/unicorn.sock;
}
}
With
/etc/nginx/sites-enabled/sahitoo file :
server {
listen 80;
server_name myapp.com;
access_log /var/log/nginx/sahitoo.access.log;
error_log /var/log/nginx/sahitoo.error.log;
root /www/sahitoo/public;
# direct to maintenance if this file exists
if (-f $document_root/system/maintenance.html) {
rewrite ^(.*)$ /system/maintenance.html last;
break;
}
location / {
proxy_redirect http://sahitoo/ /;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
# If the file exists as a static file serve it directly
if (-f $request_filename) {
break;
}
if (!-f $request_filename) {
proxy_pass http://sahitoo;
break;
}
}
error_page 500 502 503 504 /500.html;
location = /500.html {
root /home/kar/www/sahitoo/public;
}
}

Answer 1

This would happen if you are running ruby on a different user, possibly root and it doesn't have any privilege on current user, are you sure you are getting results from
'ruby -v' or 'rails -v'
.

Answer 2

I would suggest to take a look at this working example nginx.conf :
upstream unicorn-your_app {
server unix:/tmp/unicorn.your_app.sock fail_timeout=0;
}
server {
listen 80;
server_name myapp.com;
root /www/sahitoo/current/public;
location ^~ /assets/ {
gzip_static on;
expires max;
add_header Cache-Control public;
}
try_files $uri/index.html $uri #unicorn-yourapp;
location #unicorn-yourapp {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
proxy_pass http://unicorn-your_app;
}
error_page 500 502 503 504 /500.html;
client_max_body_size 4G;
keepalive_timeout 10;
}
As you can see there are some differents:
upstram block;
root points to your_dir/current/public;
try_files routine;
location #unicorn-yourapp;
If you would like to get a deeper understanding at the topic, there is very nice Railscast.