Docker images wont run in background
<p>I created my first Dockerfile, but when i run the command</p>

<pre><code>sudo docker ps
</code></pre>

<p>The container isn't running in the background, here's my dockerfile:</p>

<pre><code># Set the base image to Ubuntu
FROM debian:jessie

# File Author / Maintainer
MAINTAINER &lt;Qop&gt;

# Update the repository sources list
RUN apt-get update

################## BEGIN INSTALLATION ######################

RUN apt-get update &amp;&amp; apt-get upgrade -y
RUN apt-get install -y \
vim \
apache2

##################### INSTALLATION END #####################

# Expose the default port
EXPOSE 81

# Default port to execute the entrypoint (MongoDB)
CMD ["--port 81"]

# Set default container command
ENTRYPOINT /bin/bash
</code></pre>