运行 unicorn 服务器作为守护进程（nginx 的反向代理）

Question

我是运行独角兽 rails 服务器。这是我的配置。

config/unicorn.rb

# set path to application
app_dir = File.expand_path("../..", __FILE__)
shared_dir = "#{app_dir}/shared"
working_directory app_dir

# Set unicorn options
worker_processes 1
preload_app true
timeout 30

# Set up socket location
#listen "#{shared_dir}/sockets/unicorn.sock", :backlog => 64
listen "/tmp/unicorn.sock", :backlog => 64

# Logging
stderr_path "/var/log/unicorn/stderr.log"
stdout_path "/var/log/unicorn/stdout.log"

# Set master PID location
pid "/tmp/unicorn.pid"

/etc/nginx/site-enabled/rails_unicorn.conf

upstream app {
    server unix:/tmp/unicorn.sock fail_timeout=0;
    keepalive 8;
}

server {
    listen 80;
    server_name rails.example.com;
    passenger_enabled on;
    passenger_app_env development;
    root /home/ubuntu/webapp/rails/simple/public;

    location / {
        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-NginX-Proxy true;

        proxy_pass http://app/;
        proxy_redirect off;
    }
}

使用 rails server unicorn 一切正常，但是当我尝试使用 rails server unicorn -d 使其成为守护进程时，出现连接错误。

2015/11/08 00:21:06 [error] 9587#0: *5 connect() to unix:/tmp/unicorn.sock
failed (111: Connection refused) while connecting to upstream, client: 
68.203.30.28, server: rails.example.com, request: "GET / HTTP/1.1", upstream: 
"http://unix:/tmp/unicorn.sock:/", host: "rails.example.com"

可能出了什么问题？

Answer 1

命令应该是unicorn -c config/unicorn.rb -D，在app目录下执行命令。

来自 https://www.digitalocean.com/community/tutorials/how-to-deploy-sinatra-based-ruby-web-applications-on-ubuntu-13 的提示。

Answer 2

unicorn-rails 存在问题。参见 https://github.com/samuelkadolph/unicorn-rails/issues/25

当您将 -d (--daemon) 命令行标志传递给 rails server 时，Rack 会使用 Process.daemon 守护进程，它会执行隐式 chroot("/").之后，unicorn-rails 尝试在相对文件路径下找到 config/unicorn.rb，当然文件系统根目录中缺少该路径（/config/unicorn.rb 不存在）。

这就是为什么在您的情况下，/tmp/unicorn.sock 未配置并且反向代理失败。

运行 unicorn 服务器作为守护进程（nginx 的反向代理）

Running unicorn server as daemon (reverse proxy to nginx)

ruby-on-rails

nginx

unicorn

config/unicorn.rb

/etc/nginx/site-enabled/rails_unicorn.conf