Nginx 1.1.4可以使用HTTP1.1 keepalive指令服务上游连接,请参阅official documentation(它与keepalived客户端的连接不同).所以Unicorn配置如下所示：

upstream unicorn {
  server             unix:/tmp/unicorn.todo.sock fail_timeout=0;
  keepalive          4;
}

server {
  try_files          $uri/index.html $uri @unicorn;
  keepalive_timeout  70;

  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;

    proxy_http_version 1.1;
    proxy_set_header   Connection "";
  }
}

这些标头是HTTP连接所必需的：proxy_http_version和proxy_set_header.

所以问题是配置有效还是套接字本身是永久性的？

解决方法:

是的,它是有效的.在HTTP Keepalive方面,UNIX-socket和TCP / IP-socket之间没有区别.