Packer introduction

It is an immutable infra.What is it?

Immutable Infrastructure:
------------------------
treat ur servers like cattle , not cats(pets).
cattle, termed as replaceable items easily.

cats:
-------
kepts alive at all costs.
need manual intervention
difficult to scale
high-stress

cattle:
-------
expendable
work "out of the box"
easy to scale
low-stress

other benefits of immutabe infra:
--
testable infra
reproduce production
unit of deployment
confident changes

Why no docker?
---------
No windows support
application re-archtecture
orechestration

Why Packer?
----
utilize native tools
integrate with configuration manager
Easy to convert to Docker