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1. Important concepts about Terraform
Providers- Providers are in charge of developing and managing resources. Terraform is
built on a plugin architecture. The provider binary will be downloaded and installed using
the ‘in it’ command. AWS, Azure, Docker, Kubernetes, and others are examples.
Resources- These are small building pieces with one or more infrastructure components,
such as a virtual machine, a subnet, or a load balancer. Because the resource name and type
server serve as an identification for a specific resource, it must be unique.
Modules- Modules are used as containers for many resources that may be utilized to
organize configuration code and make it reusable. At least one module, known as the ‘root’
module, is present in every Terraform configuration.
Input variables- The input variables are used to define your infrastructure’s configuration
values. If it needs to be modified, these values can be utilized frequently without recalling
every occurrence.
Output Variables- After the infrastructure has been deployed, the output variables are
utilized to obtain information about it. These can be used for providing information to the
server, such as IP addresses.
Terraform Remote- You can run Terraform in a remote environment with shared access to
the state to share infrastructure responsibility. The remote backend’ is the name for this
capability.
Important Terraform Commands
Terraform version- This displays the Terraform version currently installed on the system.
This might be useful for identifying problems or new methods to work with the current
version.
Terraform plan- Generates a plan for executing Terraform. To ensure that the Terraform
state is up-to-date, it reads the current state of any pre-existing remote objects. Then, the
current state is compared to the previous state, and the differences are calculated.
• A set of change actions is proposed to make the remote objects fit the configuration. The
changes will not be implemented as a result of this.
• If this proposal meets your expectations, it can be implemented later.
Terraform fmt- This converts Terraform configuration files to a standard format. Because
the canonical format may differ slightly between Terraform versions, this command should
be executed on modules after upgraded Terraform.
Terraform providers- These display information about the configuration provider needs in
the current working directory.
Terraform validate- This command verifies that a configuration is internally consistent and
syntactically correct.
Terraform apply- The actions specified in a Terraform plan are carried out using this
command.
Terraform destroy- This command destroys all remote objects handled by a Terraform
setup.
Terraform import- Terraform may import infrastructure that already exists. This
command enables us to put resources developed through other means under Terraforms
control.

2. Terraform show- Converts a state or plan file into a human-readable format. This can be
used to check a plan to see if the planned operations are as expected or to check the present
condition.
Terraform output- The value of an output variable is extracted from the state file by
Terraform output. The result will show all of the root module’s outcomes with no further
arguments.
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