Error 500 access in rails app with puma and nginx - ruby-on-rails

Question

I have 6 containers to create my own application with microservices. In this project I have an example app. The problem happens when I try to access to the URL (http://localhost:80/) the browser returns error 500 with message:
return We're sorry, but something went wrong. If you are the
application owner check the logs for more information.
List Containers:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
69ee0ef25faa falcon_nginx "/usr/sbin/nginx" 59 seconds ago Up 10 seconds 0.0.0.0:80->80/tcp falcon_nginx_1
411e41943a35 falcon_web "foreman start" About a minute ago Up 11 seconds 0.0.0.0:3000->3000/tcp falcon_web_1
95de66fe7aae redis "/entrypoint.sh redis" About a minute ago Up 12 seconds 6379/tcp falcon_redis_1
7693b7e2d2eb memcached:latest "/entrypoint.sh memca" About a minute ago Up 12 seconds 0.0.0.0:11211->11211/tcp falcon_memcached_1
020566c4a77a mysql:latest "/entrypoint.sh mysql" About a minute ago Up 12 seconds 0.0.0.0:3306->3306/tcp falcon_db_1
7bf8176503f4 busybox "true" About a minute ago Exited (0) About a minute ago mysql_data
Log:
web_1 | 14:34:04 web.1 | started with pid 32
web_1 | 14:34:04 log.1 | started with pid 33
web_1 | 14:34:04 log.1 | ==> log/puma.stderr.log <==
web_1 | 14:34:04 log.1 | === puma startup: 2015-11-05 10:39:01 -0300 ===
web_1 | 14:34:04 log.1 | === puma startup: 2015-11-09 14:33:16 +0000 ===
web_1 | 14:34:04 log.1 |
web_1 | 14:34:04 log.1 | ==> log/development.log <==
web_1 | 14:34:04 log.1 |
web_1 | 14:34:04 log.1 | ==> log/puma.stdout.log <==
web_1 | 14:34:04 log.1 | [17288] - Gracefully shutting down workers...
web_1 | 14:34:04 log.1 | [17288] === puma shutdown: 2015-11-05 10:39:07 -0300 ===
web_1 | 14:34:04 log.1 | [17288] - Goodbye!
web_1 | 14:34:04 log.1 | === puma startup: 2015-11-09 14:33:16 +0000 ===
web_1 | 14:34:04 log.1 | [31] * Starting control server on unix:///tmp/puma-status-1447079596225-31
web_1 | 14:34:04 log.1 | [31] - Gracefully shutting down workers...
web_1 | 14:34:04 log.1 | [39] Early termination of worker
web_1 | 14:34:04 log.1 | [43] Early termination of worker
web_1 | 14:34:04 log.1 | [31] === puma shutdown: 2015-11-09 14:33:24 +0000 ===
web_1 | 14:34:04 log.1 | [31] - Goodbye!
web_1 | 14:34:05 web.1 | [32] Puma starting in cluster mode...
web_1 | 14:34:05 web.1 | [32] * Version 2.11.2 (ruby 2.1.5-p273), codename: Intrepid Squirrel
web_1 | 14:34:05 web.1 | [32] * Min threads: 1, max threads: 16
web_1 | 14:34:05 web.1 | [32] * Environment: development
web_1 | 14:34:05 web.1 | [32] * Process workers: 2
web_1 | 14:34:05 web.1 | [32] * Phased restart available
web_1 | 14:34:05 web.1 | [32] * Listening on unix:///home/app/tmp/sockets/puma.sock
web_1 | 14:34:05 web.1 | [32] Use Ctrl-C to stop
web_1 | 14:34:05 log.1 | === puma startup: 2015-11-09 14:34:05 +0000 ===
web_1 | 14:34:05 log.1 |
web_1 | 14:34:05 log.1 | ==> log/puma.stderr.log <==
web_1 | 14:34:05 log.1 | === puma startup: 2015-11-09 14:34:05 +0000 ===
web_1 | 14:34:05 log.1 |
web_1 | 14:34:05 log.1 | ==> log/puma.stdout.log <==
web_1 | 14:34:05 log.1 | [32] * Starting control server on unix:///tmp/puma-status-1447079645129-32
web_1 | 14:34:09 log.1 | [32] - Worker 1 (pid: 44) booted, phase: 0
web_1 | 14:34:09 log.1 | [32] - Worker 0 (pid: 40) booted, phase: 0
Nginx site:
upstream rails {
server web fail_timeout=0;
}
server {
listen 80;
client_max_body_size 2M;
server_name localhost;
keepalive_timeout 5;
root /home/app/public;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
location ~ ^/(assets)/ {
gzip_static on;
expires max;
add_header Cache-Control public;
}
location / {
try_files $uri/index.html $uri.html $uri #app;
error_page 404 /404.html;
error_page 422 /422.html;
error_page 500 502 503 504 /500.html;
error_page 403 /403.html;
}
location #rails {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_redirect off;
proxy_pass http://rails;
}
location = /favicon.ico {
expires max;
add_header Cache-Control public;
}
}
For more details check project
Docker version 1.8.1
docker-compose version: 1.4.0
Thanks for the help :)

Answer 1

There is an error in your nginx conf:
try_files $uri/index.html $uri.html $uri #app;
Try this:
try_files $uri/index.html $uri.html $uri #rails;

Answer 2

Ok guys, I found the problem with help #ehoffmann
As comments #ehoffmann i have change app to rails.
Communication between puma and nginx must be via tcp. I change in docker-compose.yml line command: foreman start to command: bundle exec puma -e development -p 3000
Log: Listening on tcp://0.0.0.0:3000