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%title: Terraform
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%author: Hubert
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# Terraform : introduction
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<br>
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* C'est quoi ? management d'infrastructure
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* construire
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* modifier
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* versionner
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* site : https://www.terraform.io/ | Hashicorp
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<br>
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* utilisable sur de nombreux providers :
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https://www.terraform.io/docs/providers/index.html
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* providers de différents types : cloud, software, réseau, database...
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* action sur infrastructure > fichiers de configurations (HCL)
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* génération d'un plan d'application > application du plan (état final recherché)
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<br>
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* utilisation :
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* IaC (infrastructure as code)
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* automatisation d'infrastructure
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* maintien d'infrastructure
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* CI/CD
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----------------------------------------------------------------------
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# Terraform : introduction
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<br>
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* State :
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* stockage de l'état (State) de l'infra et sa configuration
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* diff entre l'état réel et le state // metadata // objectif de perfs sur de large infra
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* state = terraform.tfstate
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* tfstate >> plan >> changements/créations
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<br>
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* différentes étapes :
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* refresh
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* plan
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* apply
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* destroy
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```
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apply Builds or changes infrastructure
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destroy Destroy Terraform-managed infrastructure
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import Import existing infrastructure into Terraform
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init Initialize a Terraform working directory
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plan Generate and show an execution plan
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refresh Update local state file against real resources
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show Inspect Terraform state or plan
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validate Validates the Terraform files
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```
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----------------------------------------------------------------------
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# Terraform : introduction
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<br>
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* fichiers utilisés = .tf
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* resources = une brique d'infra (instances, containers, switch...)
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* cycle de vie : création/lecture/modif/suppression
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* utilisation par l'API des providers
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* Iaas PaaS SaaS
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