Docker

Docker is a type of container - all that is required to run your application is packaged within the container.
Underlying host - OS that it runs on is completely abstracted.
Idea of layers

Terminologies

Guest
Host

Components

• Core
  • Daemon -
  • Machine (previously boot2docker) -
  • Client - interacts with the daemon
• Registry
• Image
• Container

How is docker different from a VM?

A VM also includes the entire host / operating system -> this typically takes up lots of space

Why use docker

• Can run anywhere, on anything - supported on most major OSes: Windows, MacOS, Linux
• Allow you to develop and deploy in any languages and stacks.
• Works on my machine, at scale

TODO

• docker volumes
• what is docker swarm (link to orchestration, - also, write about orchestration)
• how is this different from k8s
• docker-compose
• docker filesystem - it has its own filesystem (this is outside of volumes)
• best practices
  • why is using WORKDIR a best practice??

References:
1. What is Docker and how does it work?