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POTrouble serving Rails 3 app with nginx + unicorn on EC2
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  1. POTrouble serving Rails 3 app with nginx + unicorn on EC2
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    copied!<p>When I point my browser to "rails_app.com", I can view rails_app/public/index.html on the EC2 instance, but when I delete rails_app/public/index.html I get the nginx 403 error, </p> <pre><code> directory index of "/home/www-data/rails_app/public/" is forbidden, </code></pre> <p>instead of being able to see my Rails 3.0.3 rails_app. I'm using</p> <pre><code>Nginx Version 0.8.54 Unicorn_rails Version 3.4.0 </code></pre> <p>One post I read said that I need to make sure that the correct version of ruby is available for user www-data, which I did. I have the directory owners for the rails_app set for user and group to www-data, and the permissions set to 775. I can see that the HTTP requests are reaching nginx by looking at the access log. I have DNS setup for my domain name, "rails_app.com" to point to an AWS Elastic IP address which is the Elastic IP of the EC2 instance that I am running nginx + unicorn with my rails app on. </p> <p><strong>I think I solved this 403 error above as described in Update 2 below. Now I get a 500 error. I fixed the 500 error, as described in Update 4 below.</strong></p> <p>I am runnng nginx with </p> <pre><code>/usr/sbin/nginx -c /home/www-data/rails_app/config/nginx.conf </code></pre> <p>and I am running unicorn with</p> <pre><code>bundle exec unicorn_rails -p 8000 -E production -c /home/www-data/rails_app/config/unicorn.rb -D </code></pre> <p>Here is my unicorn.rb:</p> <pre><code>worker_processes 1 preload_app true main_dir = '/home/www-data/rails_app' working_directory '/home/www-data/rails_app' listen 8000, :tcp_nopush =&gt; true listen "/tmp/shop.socket", :backlog =&gt; 2048 timeout 30 user 'www-data' shared_path = "#{main_dir}/shared" pid "#{shared_path}/pids/unicorn.pid" stderr_path "#{shared_path}/log/unicorn.stderr.log" stdout_path "#{shared_path}/log/unicorn.stdout.log" </code></pre> <p><strong>UPDATE 1 -</strong> I simplified my nginx.conf, after reading this <a href="http://wiki.nginx.org/Pitfalls" rel="nofollow">link</a> on Nginx Pitfalls. Here is my nginx.conf:</p> <p><strong>UPDATE 2 -</strong> This <a href="http://www.ruby-forum.com/topic/2437227" rel="nofollow">post</a>, said that having $uri/ in try_files causes the 403 error, because nginx can't list the directory. So I removed $uri/ from try_files and now I get a 500 error, with nothing showing up in the nginx or unicorn error logs. Any ideas how to debug this? </p> <pre><code>user www-data www-data; worker_processes 2; error_log /var/log/nginx/error.log notice; pid /var/run/nginx.pid; events { worker_connections 1024; accept_mutex on; } http { include /etc/nginx/mime.types; default_type application/octet-stream; sendfile on; tcp_nopush on; tcp_nodelay off; keepalive_timeout 65; client_body_timeout 120; upstream app_server { # server 127.0.0.1:8000 fail_timeout=0; server unix:/tmp/shop.socket fail_timeout=0; } log_format main '\$remote_addr - \$remote_user [\$time_local] \$request ' '"\$status" \$body_bytes_sent "\$http_referer" ' '"\$http_user_agent" "\$http_x_forwarded_for"'; access_log /var/log/nginx/access.log main; server { listen 0.0.0.0:80 ; server_name rails_app.com *.rails_app.com; index index.html index.htm index.php; root /home/www-data/rails_app/public; client_max_body_size 50M; location / { try_files $uri/index.html $uri.html $uri @app; } location @app { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://app_server; } # location / error_page 500 502 503 504 /500.html; location = /50x.html { root /home/www-data/rails_app/public; } } # server } # http </code></pre> <p>Using a TCP port for unicorn, I can see that unicorn is listening using</p> <pre><code>netstat -natp </code></pre> <p>Now the error I get is the 500.html page displayed:</p> <pre><code> We're sorry, but something went wrong. </code></pre> <p>There are no errors in the nginx error logfile or in the unicorn error log file.</p> <p><strong>Update 3 -</strong></p> <p>As I dig into this more, I think the problem might be with unicorn. When I run the rails app at this <a href="http://sirupsen.com/setting-up-unicorn-with-nginx/" rel="nofollow">example</a>, it works fine, but that rails app is using sqlite3 instead of mysql. Also this example allows for zero downtime deployment, by using the before_fork and after_fork code here:</p> <pre><code> before_fork do |server, worker| defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect! end after_fork do |server, worker| defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection end </code></pre> <p>When I try to run my rails_app with mysql and using the before_fork, after_fork code above in my unicorn.rb file, it fails and I get the error:</p> <pre><code>active_record/connection_adapters/abstract/connection_pool.rb:316:in `retrieve_connection': ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished) </code></pre> <p><strong>Update 4 -</strong></p> <p>I added -d (debug) to the unicorn_rails command line as</p> <pre><code>bundle exec unicorn_rails -p 8000 -E production -c /home/www-data/rails_app/config/unicorn.rb -d -D </code></pre> <p>and found a number of errors, the first being that config/application.rb was missing config.secret_token. Added that and continue to debug.</p>
 

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