502 Nginx and Puma - Ubuntu 14.04

Question

I can’t figure out how to configure properly nginx and puma in my ruby on rails application. When a access it in the browser I get a 502.

I see many similar files:

/etc/nginx/nginx.conf
/etc/nginx/sites-enabled/myapp
/etc/nginx/sites-enabled/myapp_production
/etc/nginx/sites-avaliable/myapp_production
~/apps/me/current/config/ngnix.conf

Do I really need that file config/nginx.conf inside my application? How do sockets are supposed to be configured and work? Is there a file among these I mentioned I don`t really need?

If Nginx was working/configured properly it should show this file /var/www/html/index.nginx-debian.html ?

If you need any additional information to be able to help me I’ll gladly provide it. Thanks in advance, Diego

Flamber Hansen · Answer

Hi @DiegoBenetti /etc/nginx/nginx.conf = this is the main Nginx configuration./etc/nginx/sites-avaliable/myapp_production = this is one of your sites./etc/nginx/sites-enabled/myapp = this is one of your sites, should be a symlink./etc/nginx/sites-enabled/myapp_production = this is most likely a symlink.~/apps/me/current/config/ngnix.conf = I do not know what this is. The main Nginx configuration should not have any specific website information. Your websites are normally located in sites-available and then symlinked from sites-enabled, so the sites that are actually active is located in sites-enabled. If that’s confusing, then you can move all files from sites-available to sites-enabled - that means every file will be active. You should post the ~/apps/me/current/config/ngnix.conf since I don’t know what it is. If Nginx was configured correctly, then it would normally show content from the root directory specified in one of the site-configurations. And instead of just the visible error message, let’s have a look in the error log: tail -30 /var/log/nginx/error.log

DiegoBenetti · Answer

I tried to follow thisdigitalOcean tutorial This tutorial, in the end of 6th step, suggests that nginx.conf file you asked for. The following is mine: upstream puma { server unix:///home/deploy/apps/diegodigital/shared/tmp/sockets/myapp-puma.sock; } server { listen 80 default_server deferred; server_name my.url; root /home/deploy/apps/myapp/current/public; access_log /home/deploy/apps/myapp/current/log/nginx.access.log; error_log /home/deploy/apps/myapp/current/log/nginx.error.log info; location ^~ /assets/ { gzip_static on; expires max; add_header Cache-Control public; } try_files $uri/index.html $uri @puma; location @puma { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://puma; } error_page 500 502 503 504 /500.html; client_max_body_size 10M; keepalive_timeout 10; } I’m totally beginner with nginx, so I can’t tell what is good and right configuration from what it’s not yet.I don’t know what is the nginx default configuration, how it is supposed to work. I have only one website to launch, if there is more configuration than needed to one, it means I already committed a mistake.

Spas Dobrev · Answer

upstream puma {server unix:///home/deploy/apps/diegodigital/shared/tmp/sockets/myapp-puma.sock;} server {listen 80 default_server deferred;server_name my.url; root /home/deploy/apps/myapp/current/public;access_log /home/deploy/apps/myapp/current/log/nginx.access.log;error_log /home/deploy/apps/myapp/current/log/nginx.error.log info; location ^~ /assets/ {gzip_static on;expires max;add_header Cache-Control public;} try_files $uri/index.html $uri @puma ;location @puma {proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;proxy_set_header Host $http_host;proxy_redirect off; proxy_pass http://puma; } error_page 500 502 503 504 /500.html;client_max_body_size 10M;keepalive_timeout 10;}

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502 Nginx and Puma - Ubuntu 14.04

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