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#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 [email protected]
 #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