title: Nginx error "1024 worker_connections are not enough"
body: <p>My website is running in a Docker Image using Nginx with reverse proxy.
  Site is working prefectly for many hours under heavy traffic, but eventually it stops working and giving no response with 5** time out error. 
  In AWS Elastic Beanstalks Nginx-log I found this error-message:</p>
  
  <p>[alert] 18037#0: 1024 worker_connections are not enough</p>
  
  <p>I am afraid something is wrong with my custom Nginx-config, 
  but I do not understand what it is. 
  Code from https-redirect-docker-sc.config is attached.</p>
  
  <p>I have tried to debug code to find any memory leaks or loops, but I can not find any solution.</p>
  
  <pre><code>   files:
     "/etc/nginx/sites-available/elasticbeanstalk-nginx-docker-proxy.conf":
     owner: root
     group: root
     mode: "000755"
     content: |
     map $http_upgrade $connection_upgrade {
            default        "upgrade";
            ""            "";
     }
  
     server {
         listen 80;
         server_name mydomain.no;
  
         return 301 https://www.mydomain.no$request_uri;
     }   
  
     server {
         listen 80 default_server;
  
         gzip on;
         gzip_comp_level 4;
         gzip_types text/html text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
  
         if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})T(\d{2})") {
             set $year $1;
             set $month $2;
             set $day $3;
             set $hour $4;
         }
         access_log /var/log/nginx/healthd/application.log.$year-$month-$day-$hour healthd;
  
         access_log    /var/log/nginx/access.log;
  
         location / {
             set $redirect 0;
             if ($http_x_forwarded_proto != "https") {
               set $redirect 1;
             }
             if ($http_user_agent ~* "ELB-HealthChecker") {
               set $redirect 0;
             }
             if ($redirect = 1) {
               return 301 https://$host$request_uri;
             }
  
             proxy_pass            http://docker;
             proxy_http_version    1.1;
  
             proxy_set_header    Connection            $connection_upgrade;
             proxy_set_header    Upgrade                $http_upgrade;
             proxy_set_header    Host                $host;
             proxy_set_header    X-Real-IP            $remote_addr;
             proxy_set_header    X-Forwarded-For        $proxy_add_x_forwarded_for;
         }
     }
  </code></pre>