Day02 : docker init | dockerfile

 Task today to explore:

• docker init
• dockerfile
• containerizing sample app 
  

 

• docker init :
• docker init is way to create all necessary files automatically. 
• When we run docker init command it will ask for questions like as platform, version of platform, working dir commend to run to start application.
• Once this complete it will create few files Dockerfile, .dockerignore, compose.yaml etc
• In short docker init is way to quickly create Dockerfile with its dependency.   
•  Dockerfile :
• Its an file defines how your image to be build. each line in this file forms an layer (some commands are excepted to create separate layer)
• Few commands can be used in Dockerfile:
• FROM: Specify base image
• RUN: execute command in container while building image. this could be needed to install some dependencies. 
• COPY: copy files from host directory to container directory
• WORKDIR: specify working directory in container 
• EXPOSE: used to expose port where service is running.
• Sample docker file: