Topics :

1. What is Docker
2. Virtual Machines vs. Docker
3. Introduction to Dockerfiles, images and containers
4. The Docker Hub
5. Writing a Dockerfile
6. Building an image
7. Running a container
8. Mounting volumes
9. One process per container

build/run flow :

- docker file ----build---->> docker image(like class) -----run---->> container(likeobject/instance)

Dockerfile:

- FROM keyword to specify the "base image"
- FOR keyword to copy the source code into the image
- "/var/www/html/" is location where apache looks for it's own file system 
- '.' means current folder
- EXPOSE keyword to expose port 80(localhost). container will listen at port 80

build docker file:

- docker build -t hello-world .

run docker image :

- docker run -p 80:80  hello-world
- docker run -p 80:80 -v /Users/maksud/Desktop/:/var/www/html/ hello-world