Terraform info and installation

 

Rreferred from :Learnitguide.net - Learn Linux, DevOps and Cloud

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Infrastructure as Code ( IaC):

                      IaC primarily manages the underlying infrastructure components that an application relies on. This includes:

• Virtual machines (VMs) (Virtualization is the process where all the physical components are abstracted into the abstraction of the software and provides the complete isolation from the host OS )
• Networks
• Storage
• Databases
• Load balancers(Load balancing is the process of distributing network traffic across multiple servers. This ensures no single server bears too much demand. By spreading the work evenly, load balancing improves application responsiveness. It also increases availability of applications and websites for users. Modern applications cannot run without load balancers)

IaC tools like Terraform enable you to:

Create: Provision and configure these infrastructure resources.

Use: Maintain and update the configuration of these resources.

Destroy: Decommission and remove these resources.

 

List of IaCs tool:

1. terraform 

2. Arzue resource Manager 

3.AWS Cloud foramtion

4. Google cloud Deployment Manager

5. Anisble 

6.chef

7.Pappet

8. SaltStack

9.Vagrant

Terraform :( open-source tool )

we need to create the manifest file to provision, create, and manage the infrastructure.

 uses the language HCL or optionally JSON 

Consistency: we can create a single configuration file used in different environment like Dev , Test , stage and production 

Iacs : It  created as the purpose  for so it can interconnect all the cloud resources and even the on-perm without any human related errors or syntax related errors 

Automation: it will be easy to automata or to create any infrasture for any resources.

Version Control : it has the in-build version control as its saves the  metadata of the code if is modified .

Collaboration: it can be easily collaborated within the team to create the infrasture .

Scalability : we can scale up or scale down depending upon the requirement of the project.

-->To create the infrastructure, we need to know the entire target system ( without knowing the manual process, you cannot create the automation one )

-->Terraform files should have an extension as .tf 

Terraform: Deploying Infrastructure

Write .tf files:

• Define your desired infrastructure as code.

terraform init:

• Initialize the working directory and download necessary provider plugins.

terraform plan:

• Preview the changes Terraform will make to your infrastructure.

terraform apply:

• Execute the planned changes and deploy your infrastructure to the target system.
• 
  
• Terraform Workflow:
• • Plan & Apply:
    • Developers define infrastructure in .tf files.
    • terraform plan previews the changes to be made (a "dry run").
    • terraform apply executes those changes on the target system.

  Terraform Setup:

  • Providers & Provisioners:
    • The core requires provider and provisioner configurations when a Terraform project is initialized.
    • Terraform automatically downloads the necessary provider APIs into the .terraform directory, enabling interaction with target systems.

Terraform installation :

 Simply go to google, download terraform for Windows 

then unzip the downloaded file go inside the folder it has only one exe file 

set up the environment variables and run in Cd 

or 

Simply open the Docker, in Docker Hub search for the Terraform image and in the cmd 

To pull the image of docker, docker pull hashicorp/terraform 

To run the terraform , docker run hashicorp/terraform