服务器Ruby on Rails + unicorn + nginx停止响应
我的服务器Rails工作正常，但在没有请求的10分钟后，它的响应是一个糟糕的网关。 我真的认为我的配置是有序的，但它不起作用。 我没有更多的想法发生了什么。
我的配置：
unicorn.rb：
@dir = File.expand_path(File.dirname(__FILE__)) + "/.." worker_processes 2 working_directory @dir timeout 10 listen File.join('/tmp/nutrimais.sock') listen File.join('/tmp/nutrimais_2.sock') preload_app true# if ENV['RAILS_ENV'] != 'development' GC.respond_to?(:copy_on_write_friendly=) and GC.copy_on_write_friendly = true check_client_connection false before_fork do |server, worker| Signal.trap 'TERM' do puts 'Unicorn master intercepting TERM and sending myself QUIT instead' Process.kill 'QUIT', Process.pid end defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect! end after_fork do |server, worker| Signal.trap 'TERM' do puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT' end defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection end nginx配置：
upstream nutrimais { # Path to Puma SOCK file, as defined previously server unix:/tmp/nutrimais.sock max_fails=2 fail_timeout=10s; server unix:/tmp/nutrimais_2.sock; } server { listen 80; server_name dev.nutrimais.com.br; location / { autoindex on; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header Host $host; # time out settings proxy_next_upstream http_502 timeout; proxy_next_upstream_timeout 0; proxy_next_upstream_tries 0; proxy_connect_timeout 159s; proxy_send_timeout 600; proxy_read_timeout 600; proxy_buffer_size 64k; proxy_buffers 16 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; proxy_pass_header Set-Cookie; proxy_redirect off; proxy_hide_header Vary; proxy_set_header Accept-Encoding ''; proxy_ignore_headers Cache-Control Expires; proxy_set_header Referer $http_referer; proxy_set_header Host $host; proxy_set_header Cookie $http_cookie; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-Host $host; proxy_set_header X-Forwarded-Server $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_pass http://nutrimais; } }
的Gemfile：
source 'https://rubygems.org' gem 'rails', '4.2.4' gem 'unicorn-rails', '~> 2.2' gem 'pg' gem 'mysql2', '~> 0.3.18' gem 'sass-rails', '~> 5.0' gem 'uglifier', '>= 1.3.0' gem 'coffee-rails', '~> 4.1.0' gem 'duktape' gem 'jquery-rails' gem 'turbolinks' gem 'jbuilder', '~> 2.0' gem 'bootstrap-sass' gem 'devise' gem 'simple_form' gem 'minitest' gem "paperclip", "~> 4.3" gem 'aws-sdk', ' 1.5.0.rc' gem 'sendgrid-ruby' gem 'zopim_rails' gem 'meta-tags' gem 'ckeditor' gem 'slick_rails' group :development do gem 'better_errors' gem 'binding_of_caller', :platforms=>[:mri_20] gem 'quiet_assets' gem 'rails_layout' gem 'spring-commands-rspec' gem 'web-console', '~> 2.0' gem 'spring' end group :production do gem 'therubyracer' end group :development, :test do gem 'factory_girl_rails' gem 'faker' gem 'pry-rails' gem 'pry-rescue' gem 'rspec-rails' gem 'rubocop' gem 'byebug' end group :test do gem 'capybara' gem 'database_cleaner' gem 'launchy' gem 'selenium-webdriver' end
记录时给出错误的网关：
Started GET "/menus" for 127.0.0.1 at 2016-01-20 17:25:17 +0000 I, [2016-01-20T17:25:17.580380 #9] INFO -- : Processing by MenusController#index as HTML D, [2016-01-20T17:25:17.904933 #9] DEBUG -- : [1m[36mMenu Load (322.3ms)[0m [1mSELECT `menus`.* FROM `menus` ORDER BY created_at DESC[0m I, [2016-01-20T17:25:20.006674 #9] INFO -- : Started GET "/menus" for 127.0.0.1 at 2016-01-20 17:25:20 +0000
它保留在Started GET并且什么都不做
这就是我看到的情况。 单个unicorn后端正在监听两个套接字Nginx在它们之间进行负载均衡。 但是，两个设置可能导致负载平衡“卡住”;
# Sets unlimited tries before trying next server proxy_next_upstream_tries 0; # Unlimited time allowed before passing request to next server proxy_next_upstream_timeout 0;
一些建议：
- 尝试删除上面的行
- 通过运行后端应用程序的第二个副本来实现真正的负载平衡，或者消除使用上游模块的复杂性，并将
proxy_pass直接删除到实际存在的单个后端应用程序。
最后，当您获得502时，请尝试直接测试连接后端。 然后，您将知道问题是您的后端是否真的不断下降，或者您的Nginx配置是否存在问题。
要直接测试应用程序，可以使用socat直接连接到套接字：
$ socat - UNIX-CONNECT:/you/socket/path.sock,crnl -->GET / HTTP/1.1 -->Host: example.com.com -->X-Forwarded-Proto: https -->
我发现了正在发生的事情，linux防火墙终止了连接。 当我将数据库放在同一台机器上时，它的工作没有丢失。