Important concepts about Terraform
Providers- Providers are in charge of developing and managing resources. Terraform is builtonapluginarchitecture.Theproviderbinarywillbedownloadedandinstalledusing the‘init’command.AWS,Azure,Docker,Kubernetes,andothersareexamples.
Resources- These are small building pieces with one or more infrastructure components, suchasavirtualmachine,asubnet,oraloadbalancer.Becausetheresourcenameandtype serverserveasanidentificationforaspecificresource,itmustbeunique.
Modules- Modules are used as containers for many resources that may be utilized to organizeconfigurationcodeandmakeitreusable.Atleastonemodule,knownasthe‘root’ module,ispresentineveryTerraformconfiguration.
Input variables- Theinputvariablesareusedtodefineyourinfrastructure’sconfiguration values. Ifit needs tobemodified, these valuescanbeutilized frequentlywithoutrecalling everyoccurrence.
Output Variables- After the infrastructure has been deployed, the output variables are utilizedtoobtaininformationaboutit.Thesecanbeusedforprovidinginformationtothe server,suchasIPaddresses.
Terraform Remote- YoucanrunTerraforminaremoteenvironmentwithsharedaccessto the state to share infrastructure responsibility. The remote backend’ is the name for this capability.
ImportantTerraformCommands
Terraform version- ThisdisplaystheTerraformversioncurrentlyinstalledonthesystem. This might be useful for identifying problems or new methods to work with the current version.
Terraform plan- Generatesaplan forexecutingTerraform. Toensurethat theTerraform state is up-to-date, it reads the current state ofany pre-existing remote objects. Then, the currentstateiscomparedtothepreviousstate,andthedifferencesarecalculated.
• A set of change actions is proposed to make the remote objects fit the configuration. The changeswillnotbeimplementedasaresultofthis.
• Ifthisproposalmeetsyourexpectations,itcanbeimplementedlater.
Terraform fmt- ThisconvertsTerraformconfigurationfilestoastandardformat.Because thecanonicalformatmaydifferslightlybetweenTerraformversions,thiscommandshould beexecutedonmodulesafterupgradedTerraform.
Terraform providers- Thesedisplayinformationabouttheconfigurationproviderneedsin thecurrentworkingdirectory.
Terraform validate- Thiscommandverifiesthataconfigurationisinternallyconsistentand syntacticallycorrect.
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 ahuman-readable format. This canbe usedtocheckaplantoseeiftheplannedoperationsareasexpectedortocheckthepresent 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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