Terraform

Question 1

What is

Resource?

Answer 1

Resource block describes one or more infrastructure objects, such as virtual networks, compute instances, or higher-level components such as DNS records.

Question 2

What is

Provider?

Answer 2

Plugin form cloud provider that allow to manage infra specific for cloud.

Question 3

What is

Module?

Answer 3

Modules are containers for multiple resources that are used together.
Each main.tf in folder is module on it own.

Question 4

How to

How to call Module and why?

Answer 4

module "bigquery_datasets" {
  source  = "<source_path>"
}

You can call it to reuse configuration from another module

Question 5

What is

What are sources of the module?

Answer 5

1. From local file
2. Github
3. Http
4. Cloud Storage Buckets

Question 6

How to

How to change resoucre argument value when importing whole module? like

module "bigquery_datasets" {
  source  = "../modules/bigquery_datasets"
}

Answer 6

1. Move OG name to variables
2. Then dirrecly change this var in module file
   ~~~
   module “bigquery_datasets” {
   source = “../modules/bigquery_datasets”
   dataset_name = “offers”
   }
   ~~~

Question 7

How to

How to make resource creation dependend on another resource?

Answer 7

Use

depends_on = [
    resource_type.resource_name
  ]

Block

Question 8

How to

How to make multiple resources via one block?
(there is 2 methods)

Answer 8

resource "aws_iam_user" "the-accounts" {
  for_each = toset(["Todd", "James", "Alice")
  name     = each.key
}

OR
~~~

resource “aws_iam_user” “the-accounts” {
count = 4
name = “Server ${count.index}”
}
~~~

Question 9

How to - console

How to show dependency grap?

Answer 9

terraform graph

Question 10

How to

How to declare variables?

Answer 10

In variables.tf file declared like

variable "project" {
  type    = string
}

Question 11

How to

How to set variables?

Answer 11

1.In variables.tf file like

variable "project" {
  type    = string
  default = "sc-9369-dataengineering-dev"
}

2.terraform apply -var="project=sc-9369-dataengineering-dev"
3.In terraform.tfvars file and running terraform apply -var-file="terraform.tfvars"