Dockerfile instructions

• Refer Here
• Instructions

INSTRUCTION ARGS

## Examples
FROM openjdk:8

RUN apt-get update

• CMD and ENTRYPOINT:

  • These command execute when container is creating
  • CMD can be overritten
  • ENTRYPOINT cannot be overritten

• How to get inside docker container

  • It is called as interactive mode
  • In two scenarios
    • While creating container docker container run -it image:tag <shellterminal>
      • docker container run -it alpine
      • docker container run -it ubuntu /bin/bash
      • To exit and stop the container execute command exit
      • TO exit and keep your container to be in running status Ctrl+p+q
    • while container is running
      • docker container exec -it <containerid>

Docker Container Lifecycle

Refer here the below image from scmgalaxy for better understanding

Excercise

1. Manual Steps for gameoflife
   • Install java
   • Install tomcat
   • Copy file from https://qt-s3-new-testing.s3-us-west-2.amazonaws.com/gameoflife.war to tomcat webapps folder
   • url would be <ip>:<portexposed>/gameoflife