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 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 upgrading 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.

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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