I try to deploy a testing application in production mode to VPN using:
My app was deployed successfully, but it threw 500.html.
The app had made migration and got assets in public directory. There was no errors during deployment and in logs (production.log, unicorn_error.log, unicorn.log). I checked unicorn's workers by ps aux|grep unicorn and there was several workers working on it. Rails console in production worked too, so there was the connection with PostgreSQL.
I tried to start my app in production on the local PC and it worked with rake RAILS_ENV=production assets:precompile.
Help me to find out the problem, please. How can I detect what the reason of the problem is? Is it in my deploying code or in the settings of the server?
Nginx settings /etc/nginx/sites-available/default
upstream unicorn {
server unix:/tmp/unicorn.app.sock fail_timeout=0;
}
server {
listen 80 default deferred;
#server_name example.com;
root /var/www/app/current/public;
location ^~ /assets/ {
gzip_static on;
expires max;
add_header Cache_Control public;
#try_files $uri/index.html $uri.html $uri @app;
}
try_files $uri/index.html $uri @unicorn;
location @unicorn {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
proxy_pass http://unicorn;
}
error_page 500 502 503 504 /500.html;
keepalive_timeout 10;
}
In Gemfile I use
group :development do
gem 'capistrano', '3.2.1', require: false
gem 'capistrano-rails', require: false
gem 'capistrano-bundler', require: false
gem 'rvm1-capistrano3', require: false
gem 'capistrano3-unicorn', require: false
end
group :production do
gem 'unicorn'
end
/config/deploy.rb
set :application, 'app'
set :user, "XXX"
set :scm, :git
#set :branch, ->{ `git rev-parse --abbrev-ref HEAD`.chomp }
set :branch, "master"
set :repo_name, 'deployment'
set :repo_url, ->{ "git@github.com:sfolt/#{fetch :repo_name}.git" }
set :rails_env, fetch(:stage)
set :rvm1_ruby_version, 'ruby-2.1.5'
set :keep_releases, 5
set :format, :pretty
set :use_sudo, false
set :deploy_via, :remote_cache
set :unicorn_conf, "#{deploy_to}/current/config/unicorn.rb"
set :unicorn_pid, "#{deploy_to}/shared/pids/unicorn.pid"
set :bundle_without, [:development, :test]
set :linked_files, %w{
config/database.yml
config/secrets.yml
}
set :linked_dirs, %w{log tmp/pids tmp/cache tmp/sockets tmp/sessions}
namespace :assets do
task :precompile do
run "cd #{release_path}; rake assets:precompile RAILS_ENV=production"
end
end
namespace :deploy do
task :restart do
run "if [ -f #{unicorn_pid} ] && [ -e /proc/$(cat #{unicorn_pid}) ]; then kill -USR2 `cat #{unicorn_pid}`; else cd #{deploy_to}/current && bundle exec unicorn -c #{unicorn_conf} -E #{rails_env} -D; fi"
end
task :start do
run "bundle exec unicorn -c #{unicorn_conf} -E #{rails_env} -D"
end
task :stop do
run "if [ -f #{unicorn_pid} ] && [ -e /proc/$(cat #{unicorn_pid}) ]; then kill -QUIT `cat #{unicorn_pid}`; fi"
end
end
after 'deploy:finishing', 'deploy:cleanup'
after 'deploy:publishing', 'unicorn:restart'
/config/deploy/production.rb
set :stage, :production
set :deploy_to, "/var/www/app"
server 'XXX.XXX.XXX.XXX',
user: 'XXX',
port: XXX,
roles: [:app, :web, :db],
ssh_options: {
user: 'XXX'
}
/config/unicorn/production.rb
deploy_to = "/var/www/app"
rails_root = "#{deploy_to}/current"
pid_file = "#{deploy_to}/shared/pids/unicorn.pid"
socket_file= "#{deploy_to}/shared/unicorn.sock"
log_file = "#{rails_root}/log/unicorn.log"
err_log = "#{rails_root}/log/unicorn_error.log"
old_pid = pid_file + '.oldbin'
timeout 120
worker_processes 2
listen socket_file, backlog: 1024
pid pid_file
stderr_path err_log
stdout_path log_file
preload_app true
GC.copy_on_write_friendly = true if GC.respond_to?(:copy_on_write_friendly=)
before_exec do |server|
ENV["BUNDLE_GEMFILE"] = "#{rails_root}/Gemfile"
end
before_fork do |server, worker|
defined?(ActiveRecord::Base) and
ActiveRecord::Base.connection.disconnect!
if File.exists?(old_pid) && server.pid != old_pid
begin
Process.kill("QUIT", File.read(old_pid).to_i)
rescue Errno::ENOENT, Errno::ESRCH
end
end
end
after_fork do |server, worker|
defined?(ActiveRecord::Base) and
ActiveRecord::Base.establish_connection
end
The 502 error means there's no communication between nginx and your unicorn process.
Upon examining your config files, it seems to me that the issue is that you set unicorn to listen on this socket /var/www/app/shared/unicorn.sock, but you tell nginx to communicate with unicorn through this socket /tmp/unicorn.app.sock
Changing your upstream portion on your nginx.conf file as follows should fix the issue:
upstream unicorn {
server unix:/var/www/app/shared/unicorn.sock fail_timeout=0;
}