#Ubuntu based Hello World container
#This is the base OS and version to use
FROM ubuntu:15.04

#This is the creator of the Dockerfile
MAINTAINER name@someemail.com

#Updates the repository
#Use RUN commands to run commands against our images that we're building
#Every RUN command adds a new layer
#Launches container and runs apt-get update and stops container
RUN apt-get update
#Launches container and runs apt-get install nginx and stops container
RUN apt-get install -y nginx
#Launches container and runs apt-get install golang and stops container
RUN apt-get install -y golang

#instead combine multiple RUN commands into one long command

#Example
CMD ["echo","Hello World"]


#Important! Save this file as "Dockerfile" with a capitale "D" only

#To Build - run this command and name it helloworld as version 0.1 using the Dockerfile in this current directory
#Note: -t is an image tag
docker build -t helloworld:0.1 .

docker build -t="build1" .


#Diving Deeper into Dockerfile
#Build cache




#Simple web server
FROM ubuntu:15.04
RUN apt-get udpate
RUN apt-get install -y apache2
RUN apt-get install -y apache2-utils
RUN apt-get install -y vim
RUn apt-get clean
EXPOSE 80
CMD ["apache2ctl", "-D", "FOREGROUND"]
#end Dockerfile

#build web server
docker build -t="webserver" .

#view docker images
docker images

#Run container and map port 80 in docker to 80 on host
docker run -d -p 80:80 webserver

#Stop webserver
docker stop dockername