Dockerfile for apache container

Dockerfile

FROM ubuntu:12.04

RUN apt-get update
RUN apt-get install -y apache2

ENV APACHE_RUN_USER www-data
ENV APACHE_RUN_GROUP www-data
ENV APACHE_LOG_DIR /var/log/apache2

RUN echo 'Hello, docker' > /var/www/index.html

ENTRYPOINT ["/usr/sbin/apache2"]
CMD ["-D", "FOREGROUND"]

what does this command do ?? (CMD ["-D", "FOREGROUND"])

https://deninet.com/blog/2015/08/16/docker-scratch-part-3-entrypoints-and-ports

For people looking into this in 2022. I would suggest using a more recent ubuntu. Here's my file:

FROM ubuntu:20.04

ENV CONTAINER_TIMEZONE="Europe/Brussels"
RUN ln -snf /usr/share/zoneinfo/$CONTAINER_TIMEZONE /etc/localtime && echo $CONTAINER_TIMEZONE > /etc/timezone

RUN apt update && apt install -y apache2

ENV APACHE_RUN_USER www-data
ENV APACHE_RUN_GROUP www-data
ENV APACHE_LOG_DIR /var/log/apache2
ENV APACHE_RUN_DIR /var/www/html

RUN echo 'Hello, docker' > /var/www/index.html

ENTRYPOINT ["/usr/sbin/apache2"]
CMD ["-D", "FOREGROUND"]

For people looking into this in 2022. I would suggest using a more recent ubuntu. Here's my file:

FROM ubuntu:20.04

ENV CONTAINER_TIMEZONE="Europe/Brussels"
RUN ln -snf /usr/share/zoneinfo/$CONTAINER_TIMEZONE /etc/localtime && echo $CONTAINER_TIMEZONE > /etc/timezone

RUN apt update && apt install -y apache2

ENV APACHE_RUN_USER www-data
ENV APACHE_RUN_GROUP www-data
ENV APACHE_LOG_DIR /var/log/apache2
ENV APACHE_RUN_DIR /var/www/html

RUN echo 'Hello, docker' > /var/www/index.html

ENTRYPOINT ["/usr/sbin/apache2"]
CMD ["-D", "FOREGROUND"]

FROM ubuntu:20.04

ARG DEBIAN_FRONTEND=noninteractive

RUN apt update && apt install -y apache2

ENV APACHE_RUN_USER www-data
ENV APACHE_RUN_GROUP www-data
ENV APACHE_LOG_DIR /var/log/apache2
ENV APACHE_RUN_DIR /var/www/html

RUN echo 'Hello, docker' > /var/www/html/index.html

ENTRYPOINT ["/usr/sbin/apache2"]
CMD ["-D", "FOREGROUND"]