apachectl -DFOREGROUND exits immediately

I have found the problem for why running apachectl -DFOREGROUND does not start the httpd process. It seems we need this mkdir -p /run/apache2. Here is the full Dockerfile if anybody is interested. It is for PHP 5.6, Apache 2.4 on Alpine. I have decided to use httpd instead of apachectl as I want apache to die when the docker container stops. Using httpd will attach the process to the current shell.

FROM php:5.6-alpineRUN apk update && apk upgrade && \    apk add --no-cache apache2 && \    apk add --no-cache apache2-utils && \    apk add --no-cache php5-apache2 && \    apk add --no-cache php5-mysql && \    apk add --no-cache php5-mysqli && \    apk add --no-cache php5-pear && \    apk add --no-cache php5-cgi && \    apk add --no-cache php5-curl && \    apk add --no-cache php5-dev && \    apk add --no-cache php5-fpm && \    apk add --no-cache php5-gd && \    apk add --no-cache php5-imagick && \    apk add --no-cache php5-imap && \    apk add --no-cache php5-intl && \    apk add --no-cache php5-json && \    apk add --no-cache php5-mcryptRUN mkdir -p /run/apache2ENTRYPOINT ["httpd", "-D", "FOREGROUND"]