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feat: add Terraform notes (#111)
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Diff for: ‎.gitignore

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.DS_Store
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.vercel
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TODO.md
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.terraform
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.terraform.lock.hcl
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terraform.tfstate
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terraform.tfstate.backup

Diff for: ‎README.md

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- [Compose/Stack Files](https://github.com/Pradumnasaraf/DevOps/tree/main/docs/docker/docker-compose)
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- [Dockerfile](https://github.com/Pradumnasaraf/DevOps/tree/main/docs/docker/dockerfiles)
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<be>
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## Kubernetes
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<img align="right" src="https://user-images.githubusercontent.com/51878265/200594367-f416d081-af8f-4f48-8008-998d005b317f.png" height="100" alt="Kubernetes">
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- [Playground](docs/kubernetes/playground.md)
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- [Other Resources](docs/kubernetes/other-resources.md)
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<br>
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## GitHub Actions
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<img align="right" src="https://user-images.githubusercontent.com/51878265/211621722-c2ddc389-6e4e-4769-9dac-f18f8e71fed3.png" height="100" alt="GitHub Action">
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- [Workflows](https://github.com/Pradumnasaraf/DevOps/tree/main/docs/github-actions/Workflows)
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- [Scenarios](docs/github-actions/scenarios.md)
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- [Other Resources](docs/github-actions/other-resources.md)
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<br>
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-
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## Linux
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<img align="right" src="https://user-images.githubusercontent.com/51878265/209197882-51406a8f-04ff-4c53-a362-ac32ae8566ad.png" height="100" alt="linux">
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- [Learning Resources](docs/linux/learning-resources.md)
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- [Commands](docs/linux/commands.md)
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<br>
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## Git
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- [Learning Resources](docs/git/learning-resources.md)
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- [Commands](docs/git/commands.md)
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<br>
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## Networking
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<img align="right" src="https://user-images.githubusercontent.com/51878265/204347251-efd0e271-5d3c-4008-bdab-6f6ce5b2195f.png" height="100" alt="network">
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- [Learning Resources](docs/networking/learning-resources.md)
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- [Commands](docs/networking/commands.md)
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<br>
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## YAML
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<img align="right" src="https://user-images.githubusercontent.com/51878265/202765143-55758916-b631-4c18-aaad-718b42507d67.png" height="100" alt="YAML">
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- [Notes](docs/yaml/introduction.md)
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- [Learning Resources](docs/yaml/learning-resources.md)
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<br>
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## Golang (Go)
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<img align="right" src="https://user-images.githubusercontent.com/51878265/213385507-52f03107-388c-4992-9b5e-c89de6906e37.png" height="100" alt="network">
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- [Practice App](https://github.com/Pradumnasaraf/DevOps/tree/main/docs/golang/apps)
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- [Other Resources](docs/go/other-resources.md)
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<br>
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## Helm
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<img align="right" src="https://user-images.githubusercontent.com/51878265/202859249-b90ac510-d8e8-408d-9c07-0d2bd8e1b092.png" height="100" alt="Helm">
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- [Learning Resources](docs/helm/learning-resources.md)
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- [Charts](https://github.com/Pradumnasaraf/DevOps/tree/main/docs/helm/charts)
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<br>
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## Prometheus
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<img align="right" src="https://user-images.githubusercontent.com/51878265/202859485-eba6809e-1cb8-4bbc-ab22-efa3c91d6463.png" height="100" alt="Prometheus">
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- [Notes](docs/prometheus/introduction.md)
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- [Learning Resources](docs/prometheus/learning-resources.md)
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<br>
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## GitOps
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<img align="right" src="https://user-images.githubusercontent.com/51878265/206730962-b20f94c1-17af-48b2-b62c-b6c02dbeeb77.png" height="100" alt="Gitops">
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- [Notes](docs/gitops/introduction.md)
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- [Learning Resources](docs/gitops/learning-resources.md)
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<br>
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## ArgoCD
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<img align="right" src="https://user-images.githubusercontent.com/51878265/205495495-b3f0b395-3ce3-42d8-9274-220ff10334f6.png" height="100" alt="Argo">
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- [Learning Resources](docs/argocd/learning-resources.md)
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- [Manifest Files](https://github.com/Pradumnasaraf/DevOps/tree/main/docs/argocd/manifests)
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<br>
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## Jenkins
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<img align="right" src="https://user-images.githubusercontent.com/51878265/209197795-570330e6-fbee-4bf3-a42e-b8609e3afc46.png" height="100" alt="Jenkins">
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- [Notes](docs/jenkins/introduction.md)
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- [Learning Resources](docs/jenkins/learning-resources.md)
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- [Jenkinsfile](https://github.com/Pradumnasaraf/DevOps/tree/main/docs/jenkins/jenkinsfiles)
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<br>
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## Bash Scripting
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- [Learning Resources](docs/bash-scripting/learning-resources.md)
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- [Script](https://github.com/Pradumnasaraf/DevOps/tree/main/docs/bash-scripting/scripts)
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<br>
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## WebAssembly (WASM)
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<img align="right" src="https://github.com/user-attachments/assets/0687a31f-fa90-4aeb-b3f2-b841d8758f77" height="100" alt="Wasm">
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- [Learning Resources](docs/webassembly/learning-resources.md)
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- [Tools](docs/webassembly/tools.md)
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- [Files and Sample Apps](https://github.com/Pradumnasaraf/DevOps/tree/main/docs/webassembly/files)
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## Terraform
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<img align="right" src="https://github.com/user-attachments/assets/b81903bd-4377-4517-a1fd-8e6c99bdfa9a" height="100" alt="Terraform">
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- [Notes](docs/terraform/introduction.md)
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- [Learning Resources](docs/terraform/learning-resources.md)
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- [Commands](docs/terraform/commands.md)

Diff for: ‎docs/devsecops/_category_.json

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{
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"label": "DevSecOps",
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"position": 18
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"position": 19
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}

Diff for: ‎docs/feedback.md

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---
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sidebar_position: 20
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sidebar_position: 21
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description: Feedback and suggestions
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title: Feedback & Suggestions
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Diff for: ‎docs/qna.md

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---
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sidebar_position: 19
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sidebar_position: 20
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description: Questions and answers about DevOps
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title: Q&A
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Diff for: ‎docs/terraform/_category_.json

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{
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"label": "Terraform",
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"position": 18
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}

Diff for: ‎docs/terraform/commands.md

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---
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sidebar_position: 3
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title: Terraform Commands
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description: Terraform commands and their usage
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tags: ["Terraform", "Infrastructure as Code", "HashiCorp"]
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keywords: ["Terraform", "Infrastructure as Code", "HashiCorp"]
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slug: "/terraform/commands"
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---
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1. Terraform Init
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It is used to initialize a working directory containing Terraform configuration files.
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```bash
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terraform init
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```
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2. Terraform Plan
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It is used to create an execution plan. It shows what Terraform will do when you call apply.
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```bash
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terraform plan
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```
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3. Terraform Apply
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It is used to apply the changes required to reach the desired state of the configuration.
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```bash
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terraform apply
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```
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4. Terraform Validate
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We can run this command before applying the changes to check whether the configuration is syntactically valid and internally consistent.
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```bash
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terraform validate
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```
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It will print the exact in the console if there is any error in the configuration file.
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5. Terraform Format
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It is used to rewrite Terraform configuration files to canonical format and style.
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```bash
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terraform fmt
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```
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6. Terraform Show
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It is used to provide human-readable output of current state of the resources.
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```bash
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terraform show
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```
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We can also output the state in JSON format by using the following command:
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```bash
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terraform show -json
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```
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7. Terraform Providers
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To know the list of providers used in the configuration file, we can use the following command:
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```bash
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terraform providers
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```
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To mirror the provider configurations from the configuration file, we can use the following command:
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```bash
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terraform providers mirror ./path/to/new_local_file
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```
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8. Terraform Output
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It is used to extract the output variables from the state file.
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```bash
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terraform output
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```
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9. Terraform Refresh
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It is used to update the state file according to the real-world infrastructure.
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```bash
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terraform plan
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```
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or
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```bash
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terraform apply -refresh-only
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```
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10. Terraform Graph
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It is used to generate a visual representation of the configuration and state file.
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```bash
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terraform graph
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```
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11. Terraform Destroy
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It is used to destroy the Terraform-managed infrastructure.
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```bash
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terraform destroy
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```

Diff for: ‎docs/terraform/files/Terraform-KodeKloud.pdf

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Diff for: ‎docs/terraform/files/count/main.tf

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resource "local_file" "pet" {
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count = length(var.pet_filenames)
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filename = var.pet_filenames[count.index]
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content = "This is a file named ${var.pet_filenames[count.index]}"
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}
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output "pets" {
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value = local_file.pet
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}

Diff for: ‎docs/terraform/files/count/variable.tf

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variable "pet_filenames" {
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default = [
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"./cats.txt",
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"./dogs.txt",
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"./fish.txt",
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"./birds.txt",
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]
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}

Diff for: ‎docs/terraform/files/dependencies-type/explicit/explicit.tf

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resource local_file "my-file" {
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content = "I love Pets"
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filename = "/tmp/my-file.txt"
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depends_on = [random_pet.my-pet]
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}
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resource random_pet "my-pet" {
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prefix = "Mrs"
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separator = "."
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length = "1"
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}

Diff for: ‎docs/terraform/files/dependencies-type/implicit/implicit.tf

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resource local_file "my-file" {
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content = "My pet is ${random_pet.my-pet.id}"
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filename = "/tmp/my-file.txt"
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}
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resource random_pet "my-pet" {
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prefix = "Mrs"
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separator = "."
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length = "1"
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}

Diff for: ‎docs/terraform/files/interactive-mode/hello.tf

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resource "local_file" hello{
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filename = "./hello.txt"
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content = var.say_hello
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file_permission = "0700"
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}

Diff for: ‎docs/terraform/files/interactive-mode/hello.txt

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Helloo

Diff for: ‎docs/terraform/files/interactive-mode/variables.tf

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variable "say_hello" {
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description = "The message to write to the file"
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type = string
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}

Diff for: ‎docs/terraform/files/local-files/local.tf

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resource "local_file" "pet" {
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filename = "./pets.txt"
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content = "We love pets!"
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file_permission = "0700"
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}

Diff for: ‎docs/terraform/files/multiple-providers/my-pets.tf

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resource "local_file" "pet" {
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filename = "./pets.txt"
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content = "We love pets!"
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}
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resource "random_pet" "my-pet" {
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prefix = "Mrs"
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separator = "."
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length = "1"
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}

Diff for: ‎docs/terraform/files/output-values/main.tf

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resource "random_pet" "my-pet" {
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prefix = "Mrs"
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separator = "."
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length = "1"
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}

Diff for: ‎docs/terraform/files/output-values/outputs.tf

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output "pet_name" {
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value = random_pet.my-pet.id # The random pet name from main.tf
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description = "The random pet name generated by Terraform"
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}

Diff for: ‎docs/terraform/files/variable-definition/hello.tf

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resource "local_file" hello{
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filename = "./hello.txt"
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content = var.say_hello
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file_permission = "0700"
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}

Diff for: ‎docs/terraform/files/variable-definition/hello.txt

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Hello World

Diff for: ‎docs/terraform/files/variable-definition/terraform.tfvars

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say_hello = "Hello World"

Diff for: ‎docs/terraform/files/variable-definition/variables.tf

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variable "say_hello" {
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description = "The message to write to the file"
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type = string
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}

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