DevOps Classroom Series – 10/Jun/2020

How application in docker is isolated

• Every app running on os will get process id

• Application will be running in a os which will have some ip adress

• Application running in a os which will have storage

• Application running in an os which will have cpu & RAM

• Application running inside docker container also will get all of the above point

• Container is an isolated area of execution with

  • storage
  • CPU
  • RAM
  • Process tree
  • network interface (ip address)

• Is container new in Linux?

  • no
  • If you had to create a container it was very difficult and docker has simplified this process

• Containerization: Process of making your application run on docker containers

• image: Docker image is a packing format (as of now)

Basic Docker

• When we install docker, we get two components
  1. Docker daemon
  2. Docker client
• When we run the command to create container the following happens
• When we run the command to create another container with same image the following happens
• Default remote registry is dockerhub

What are DevOps Engineer Responsiblities over here (so far)

• Ensure you can containerize the applications ( To container applications we need to understand the steps of application deploymemnt)
  • DevOps Engineer should be able to use and create new docker images

Labsetup: (Using Docker Playground => Vm with docker already installed )

1. Navigate to here
2. If you dont have docker hub account create it from here
3. login with dockerhub credentials