session-22.txt

variables
data types
conditions
loops
functions

USER=sivakumar --> declaring and assign value to variable
vars:
	user: sivakumar
	
variable "<var-name>" {
	type = string/number/bool/list/map
	default = "<default-value>"
}

tagging strategy
-----------------
name of the resource
which project
which module
which environment
who created
which date

terraform.tfvars
-------------------
in variable declaration we can give default values.

terraform.tfvars will override default values in variables.

TF_VAR_<var-name>=value

conditions
------------

if(expression){
	these will run if expression is true
}
else{
	these will run if expression is false
}

expression ? "this will run if expression is true" : "run if false"
var.instance_name == "db" ? "t3.small" : "t3.micro"

expense
----------
if DB, instance type should be t3.small

3 instances, db, backend, frontend
if DB t3.small

and route53 records

few tags are common, project, environment, terraform


loops
------
count based loop
for loop
dynamic block loop

count.index --> 0,1,2

length(<list>)

outputs
----------
a=b, b=c, c=d
x=z, e=f, a=e

a=e, b=c, c=d, x=z, e=f