DevOps Classroom notes 07/Aug/2026

Terraform data types :

• string: a sequence of Unicode characters representing some text, like “hello”.
• number: a numeric value. The number type can represent both whole numbers like 15 and fractional values like 6.283185.
• bool: a boolean value, either true or false. bool values can be used in conditional logic.
• list (or tuple): a sequence of values, like [“us-west-1a”, “us-west-1c”]. Identify elements in a list with consecutive whole numbers, starting with zero.
• set: a collection of unique values that do not have any secondary identifiers or ordering.
• map (or object): a group of values identified by named labels, like {name = “Mabel”, age = 52}.

Terraform format

• this cmd will help to format hcl code like spaces and make prety
• terraform fmt

terraform validate

• it is used to validate syntax for tf files
• terraform validate need to run after init

terrafrom plan output:

• save your terraform plan what changes it do
• terraform plan -out=tfplan it save plan actions and changes like create, modified, destroy, replace

To apply saved plan changes

terraform apply "tfplan" plan file name should be same.

TasK

• create internet gateway, attach internet gateway
• create 2route table (public & pravite)
• create natgateway
• subnet assocation ==> route tables
• create route attach IGW to public route
• create route attach NGW to pravite route