region

secret_key

access_key

Gain insights into Terraform’s infrastructure-as-code capabilities. Learn about setting up local files, managing remote resources, and mastering unique modules, data structures, and resource management techniques.

terraform.tar.gz

TF_VAR_YOURSECRETKEY

TF_VAR_YOURACCESSKEY

TF_VAR_region

main.sh

ch 2 p1 a-managing resources 

ch 2 p4-graph

ch 2 p2- implicit dependency

ch 2 p3- explicit dependency

ch 1 p1-a terraform resources

graph

ch 1 p1-b terraform resources

ch 1 p2-a ltthw_state

ch 1 p3-a ltthw_plan

ch 1 p4-a ltthw_output

ch 1 p5-a ltthw_destroy

ch 2 p1 b-managing resources 

ch 2 p5- importing resources

ch 3 p1- ltthw_modules

ch 3 p1-b ltthw_modules

ch 3 p2-a ltthw_variables

ch 3 p2-b ltthw_variables

ch 3 p3-b ltthw_output

ch 3 p4 ltthw_structure

ch 3 p5 a datatypes

ch 3 p5 b datatypes

ch 3 p5  datatypes-complex

ch 4 p1 ltthw_null_resources

ch 4 p2 ltthw_multiple

ch 4 p3 ltthw_backends

ch 4 p3 b ltthw_backends

exercise-ex

ex-1my_name

ex-1my_name-2

ex-3nested

ex-3nested-copy

ex-4prov -1

ex-4prov -2

exercise 2

Terraform is an infrastructure-as-code (IaC) platform that allows users to manage and integrate various external resources as united infrastructure. This is achieved by using the proprietary HashiCorp Configuration Language (HCL) or JSON.

This course is a comprehensive introduction to Terraform. It helps users build confidence through foundational understanding of Terraform’s approach to resource management and the coding environment. You’ll start with an introduction to Terraform and learn how to set up local files. You’ll then take your learning to the cloud, managing remote resources by identifying unique resources and dependencies. Next, you’ll learn the modules and data structures unique to Terraform before practicing various techniques for infrastructure management, including triggers, resource creation, and backend code.

By the end of this course, you’ll have learned to think creatively and be ready to solve production and deployment problems through Terraform.

Beginner’s Guide to Terraform

## Dependencies

The dependencies are the bane of any infrastructure manager’s life. If we switch off the Virtual Machine (VM), who will complain? What about the load balancer?


Stories of switching off servers to see who complains as a way of managing unknown dependencies are incredibly common in the IT industry.


 Terraform can help manage that problem by codifying and tracking resource dependencies. However, it’s important to remember that it does not do so by magic and that our application dependencies may still need to be mapped out by whoever’s in charge of them.


## Implicit dependency


Initially, we need to set up our credentials. Then, we create a new directory with a Terraform module.

We also create a Terraform module with a defined AWS `provider`.


Then we add two resources to the `dependencies.tf` file. The first is an `AWS VPC`, similar to the one we created before. This time, we give it a name directly in the Terraform module, `ltthw-vpc`, rather than doing so manually in the AWS console.

The second `resource` type is `aws_subnet`. This subnet is attached to the `VPC`, and is linked by the VPC `id`.


That raises a problem. We don’t know the VPC’s `ID` before we create it (it’s given to us by AWS on creation). Yet we need to refer to it to link the **subnet** to the VPC via the `vpc_id`.




>**Note:**A subnet is a range of IP addresses that we can route network traffic to or set other rules against. If you don’t understand this, don’t worry about it for this course, but if you’ll manage infrastructure on cloud providers, you may want to research it on your own.



In Terraform, every resource has attributes that we can reference with the syntax `TYPE.NAME.ATTRIBUTE`. Remembering the three-letter acronym **TNA** might help you remember this pattern of referencing.



>**Note:**We assume that your AWS credentials have permissions to create an AWS VPC. If you run into problems, it may be because your account is limited, and you will need to expand its permissions or use a different one.

Now, initialize the Terraform module.


# Dependencies

The dependencies are the bane of any infrastructure manager’s life. If we switch off the Virtual Machine (VM), who will complain? What about the load balancer?


Stories of switching off servers to see who complains as a way of managing unknown dependencies are incredibly common in the IT industry.


 Terraform can help manage that problem by codifying and tracking resource dependencies. However, it’s important to remember that it does not do so by magic and that our application dependencies may still need to be mapped out by whoever’s in charge of them.


# Implicit dependency


Initially, we need to set up our credentials. Then, we create a new directory with a Terraform module.

We also create a Terraform module with a defined AWS `provider`.


Then we add two resources to the `dependencies.tf` file. The first is an `AWS VPC`, similar to the one we created before. This time, we give it a name directly in the Terraform module, `ltthw-vpc`, rather than doing so manually in the AWS console.

The second `resource` type is `aws_subnet`. This subnet is attached to the `VPC`, and is linked by the VPC `id`.


That raises a problem. We don’t know the VPC’s `ID` before we create it (it’s given to us by AWS on creation). Yet we need to refer to it to link the **subnet** to the VPC via the `vpc_id`.




>**Note:**A subnet is a range of IP addresses that we can route network traffic to or set other rules against. If you don’t understand this, don’t worry about it for this course, but if you’ll manage infrastructure on cloud providers, you may want to research it on your own.



In Terraform, every resource has attributes that we can reference with the syntax `TYPE.NAME.ATTRIBUTE`. Remembering the three-letter acronym **TNA** might help you remember this pattern of referencing.



>**Note:**We assume that your AWS credentials have permissions to create an AWS VPC. If you run into problems, it may be because your account is limited, and you will need to expand its permissions or use a different one.

Now, initialize the Terraform module.


Learn and execute implicit resource dependencies in Terraform.

Implicit Resource Dependencies

Getting Started

Local Basics

Remote Terraform

Modules and Data Structures

Intermediate Terraform Techniques

Conclusion

Implicit Resource Dependencies

Dependencies

Implicit dependency