title: ASP.NET 5.0 beta 8 in Docker doesn't start
body: <p>I have been running a website using ASP.NET 5.0 beta 7 in a Docker container, using the official Docker image - <a href="https://github.com/aspnet/aspnet-docker" rel="nofollow">https://github.com/aspnet/aspnet-docker</a> - which was working fine.</p>
  
  <p>I recently updated my project to beta 8, and changed the Dockerfile to use the beta 8 version of the Docker image. Everything works fine when I run it locally on my Windows machine, whether I use Visual Studio to start the project with IIS Express, or run it using Kestrel.</p>
  
  <p>However, then I push it to my Dokku server, it doesn't seem to start properly. I don't get any errors from the container output, but I have a CHECKS file which Dokku uses to ensure the web server has started, and this fails (indicating it hasn't started properly, or is not listening as it should be). I tried removing the CHECKS and I cannot connect to it either - I get a bad gateway message from nginx.</p>
  
  <p>I don't know why this is happening, because when I push to Dokku, I get the following response:</p>
  
  <pre><code>...
  remote: [1G-----&gt; Attempt 5/5 Waiting for 10 seconds ...[K
  remote: [1G       CHECKS expected result:[K
  remote: [1G       http://localhost/ =&gt; "My Website"[K
  
  remote: Could not start due to 1 failed checks.[K
  remote: [1G !    [K
  remote: [1Gcurl: (7) Failed to connect to 172.17.2.14 port 5000: Connection     refused[K
  remote: [1G !    Check attempt 5/5 failed.[K
  remote: [1G=====&gt; mywebsite container output:[K
  remote: [1G       info    :     [Microsoft.Framework.DependencyInjection.DataProtectionServices] User profile is     available. Using '/root/.local/share/ASP.NET/DataProtection-Keys' as key repository; keys will not be encrypted at rest.[K
  
  remote: [1G       Hosting environment: Production[K
  remote: [1G       Now listening on: http://localhost:5000[K
  remote: [1G       Application started. Press Ctrl+C to shut down.[K
  remote: [1G=====&gt; end mywebsite container output[K`
  ...
  </code></pre>
  
  <p>This seems odd because it looks like it is starting, but after the checks have failed. As I said, removing the checks means it deploys successfully but then I'm unable to connect to it.</p>
  
  <p>My Dockerfile is:</p>
  
  <pre><code>FROM microsoft/aspnet:1.0.0-beta8
  
  # Install NPM
  RUN apt-get update &amp;&amp; apt-get install -y curl
  RUN curl -sL https://deb.nodesource.com/setup | bash -
  RUN apt-get install -y nodejs
  
  # Install Gulp
  RUN npm install -g gulp
  
  COPY . /app
  WORKDIR /app
  RUN ["dnu", "restore"]
  
  WORKDIR ./src/mywebsite
  
  RUN ["npm", "install"]
  RUN ["gulp", "min"]
  
  EXPOSE 5000
  ENTRYPOINT dnx kestrel
  </code></pre>