I have the following config:  

Dockerfile 

```
FROM centos  
MAINTAINER Eduar Tua <eduartua@gmail.com>  

RUN yum -y update && yum clean all
RUN yum -y install httpd && yum clean all
RUN echo "Apache works" >> /var/www/html/index.html

EXPOSE 80

ADD run-apache.sh /run-apache.sh
RUN chmod -v +x /run-apache.sh

CMD ["/run-apache.sh"]

```

The run-apache.sh script: 

```
#!/bin/bash

rm -rf /run/httpd/* /tmp/httpd*

exec /usr/sbin/apachectl -D FOREGROUND

```

Then I build the image with: 

```
sudo docker build --rm -t platzi/httpd .  

```

then 

```
sudo docker run -d -p 80:80 platzi/httpd

```

After that when I try to run the container accepting connections from the host in the 80 port I get this: 

```
67ed31b50133adc7c745308058af3a6586a34ca9ac53299d721449dfa4996657
FATA[0002] Error response from daemon: Cannot start container     67ed31b50133adc7c745308058af3a6586a34ca9ac53299d721449dfa4996657: Error starting userland proxy: listen tcp 0.0.0.0:80: bind: address already in use

```

Any help?