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What
is Terraform? Why TF? Terraform workflow.
Introduction:
Terraform is an open-source infrastructure as code
(IaC) software tool created by Hashi Corp. It allows users to define and
provision data centre infrastructure using a high-level configuration language
known as Hashi Corp Configuration Language (HCL), or optionally JSON. Terraform Training
Why Terraform?
- Infrastructure as Code (IaC): Terraform
enables the management of infrastructure using code, which allows for
version control, collaboration, and automation. This approach is more
reliable and consistent compared to manual configuration.
- Multi-Cloud Compatibility: Terraform
supports multiple cloud service providers, including AWS, Azure, Google
Cloud Platform, and more. This flexibility enables users to manage hybrid
and multi-cloud environments from a single configuration.
Immutable Infrastructure: By promoting the concept of immutable
infrastructure, Terraform ensures that infrastructure changes are applied in a
controlled and predictable manner. This reduces the chances of configuration
drift and makes it easier to reproduce environments. Terraform Training Online
- State Management: Terraform
maintains the state of the infrastructure in a state file, which keeps
track of resource dependencies and configurations. This state management
allows Terraform to detect changes and apply updates accurately.
- Modular and Reusable Code: Terraform
allows the use of modules, which are reusable components that can be
shared and managed independently. This modularity simplifies complex
configurations and promotes best practices.
Terraform Workflow
- Write Configuration: Users
define infrastructure resources in configuration files using HCL. These
configurations describe the desired state of the infrastructure,
specifying resources like virtual machines, networking components, and
storage.
- Initialize: Run to initialize the working directory.
This command downloads the necessary provider plugins and sets up the
backend for state storage.
- Plan: Use terraform
plan to create an execution plan. Terraform
compares the current state of the infrastructure with the desired state
defined in the configuration files and generates a plan showing what
changes will be made.
- Apply: Execute terraform
apply to apply the changes required to reach
the desired state of the configuration. Terraform makes the necessary API
calls to the respective cloud service providers to create, update, or
delete resources.
- Manage State: Terraform continuously manages the state
file to track the infrastructure's state. Users can use terraform refresh to
update the state file with the actual state of resources or terraform destroy to
remove all managed infrastructure.
- Collaborate and Version Control: Store
configuration files in version control systems like Git. This practice
enables collaboration among team members, version tracking, and rollback
capabilities. Terraform Training in Hyderabad
By following this workflow, Terraform provides
a systematic and reliable approach to infrastructure management, making it a
popular choice for DevOps teams and cloud engineers.
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