docker-documentation.md

@@ -12,14 +12,20 @@ Images in Docker are packets that include the program you are going to be runnin
 
 Images are saved into a registry like Github, Gitlab or Docker Hub, where you can pull or push them. Registries can be private or public. 
 
-### Dockerfile
+## Dockerfile
+
+Dockerfile is used by Docker to build images automatically by reading the instructions from it. Dockerfile is a text document, that contains all the necessary commands to assemble an image. 
 
 We made a test container named HarmitusApp. We build the image using the official repository for OpenJDK from Docker Hub, which also has the base image from Alpine Linux. Alpine Linux is an optimal choice for the distribution base image thanks to its small size (~5MB). 
 
 Quick breakdown on what we did goes like this:
 
-*  asd
+*  Chose the openjdk:8-jre-alpine as our base image (FROM)
+*  Copied the needed files to the container (COPY)
+*  Executed the specified files (CMD)
+*  Opened tons of ports to make sure that traffic gets trough (EXPOSE)
 
+Below you can find the Dockerfile we made for HarmistusApp to assemble a Java image.
 <pre>
 <code>
 FROM openjdk:8-jre-alpine
@@ -34,7 +40,7 @@ EXPOSE 8080 25 20 9888 9889 9997 9999 22 2181 9090 9094 9093 9998
 
 ## Container
 
-Containers are images that you are currently running. 
+Container is an image that is running, usually a single process
 
 ## Docker basic commands