title: Error 503 Service Unavailble - Isomorphic React App
body: <p>Hello my app based on react starter kit (node js app), i build it and uploaded it as docker image. And made some stress test with siege and with <code>apache-jmeter</code>, when the concurrent users are more than 70 i get errors success 200</p>
  
  <blockquote>
    <p>[error] socket: unable to connect sock.c:230: No such file or directory
        [error] socket: unable to connect sock.c:230: Address family not supported by protocol
        [error] socket: unable to connect sock.c:230: Address family not supported by protocol
        HTTP/1.0 503   0.39 secs:     108 bytes ==> GET  /
        HTTP/1.1 200   2.43 secs:   37457 bytes ==> GET  /</p>
  </blockquote>
  
  <p>The website go up and down from 503 go to 200 and again the same.
  When the error 503 i cannot access website and its give me 503 service unavailable.</p>
  
  <p>When concurrent users are less than 65 it is working normal without error and i can access website.</p>
  
  <p>I tried testing site locally too but i get only this type of errors without 503:-</p>
  
  <pre><code>[error] socket: unable to connect sock.c:230: No such file or directory
  [error] socket: unable to connect sock.c:230: No such file or directory
  [error] socket: unable to connect sock.c:230: No such file or directory
  [error] socket: unable to connect sock.c:230: Address family not supported by protocol
  [error] socket: unable to connect sock.c:230: No such file or directory
  [error] socket: unable to connect sock.c:230: No such file or directory
  [error] socket: unable to connect sock.c:230: Address family not supported by protocol
  [error] socket: unable to connect sock.c:230: No such file or directory
  [error] socket: unable to connect sock.c:230: No such file or directory
  HTTP/1.1 200   7.55 secs:   37895 bytes ==&gt; GET  /
  HTTP/1.1 200   7.57 secs:   37896 bytes ==&gt; GET  /
  HTTP/1.1 200   7.70 secs:   37898 bytes ==&gt; GET  /
  [error] socket: unable to connect sock.c:230: No such file or directory
  [error] socket: unable to connect sock.c:230: No such file or directory
  </code></pre>
  
  <p>Any suggestion how fix this or get the source of error? </p>