Puma和Nginx 502错误网关错误(Ubuntu Server 14.04)

我需要部署我的rails应用程序，所以我从这里开始遵循所有步骤，

I need to deploy my rails application,So I have followed all step from here, https://www.digitalocean.com/community/tutorials/how-to-deploy-a-rails-app-with-puma-and-nginx-on-ubuntu-14-04

但是在本教程结束时，我遇到了此错误->"502 Bad Gateway"

But end of the tutorial, I get this error --> "502 Bad Gateway"

编辑
现在出现错误消息->很抱歉，出了点问题."
但是Nginx错误输出是相同的，我检查了puma错误消息，但它们只是在启动时和正常停止时记录日志.

EDIT
The error message now --> "We're sorry, but something went wrong."
But Nginx error output is the same, I check puma error messages but they just log when it start and when it stop gracefully.

在app_directory/log下跟踪日志不会产生任何输出.
puma-manager->我检查了它是否正常工作
路径--->我已经检查了三遍

Rails logs which is under app_directory/log does not produce any output.
puma-manager --> I checked it works correctly
paths ---> I have checked three times

Nginx error.log输出消息:

Nginx error.log output message:

2016/05/18 14:22:21 [crit] 1099#0: *7 connect() to unix:/home/deploy   /hotel-automata/shared/sockets/puma.sock failed (2: No such file or directory) while connecting to upstream, client: 192.168.2.105, server: localhost, request: "GET /favicon.ico HTTP/1.1", upstream: "http://unix:/home/deploy/hotel-automata/shared/sockets/puma.sock:/500.html", host: "192.168.2.170"

OS-> Vmware Player，桥接网络Ubuntu Server 14.0.4
Ruby版本:2.3.1
Rails版本:4.2.5.2

OS -> Vmware Player, Bridged Network Ubuntu Server 14.0.4
Ruby Version: 2.3.1
Rails Version: 4.2.5.2

这是我的/etc/nginx/sites-available/default的Nginx配置内容

This is my nginx config contents of /etc/nginx/sites-available/default

upstream app {
# Path to Puma SOCK file, as defined previously
server unix:/home/deploy/hotel-automata/shared/sockets/puma.sock fail_timeout=0;
}

server {
listen 80;
server_name localhost;

root /home/deploy/hotel-automata/public;

try_files $uri/index.html $uri @app;

location @app {
    proxy_pass http://app;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
}

error_page 500 502 503 504 /500.html;
client_max_body_size 4G;
keepalive_timeout 10;
}