day41.md

On the forty first day, I learned the following things about Terraform.

Terraform Refresh

• First of all remove the second repository data in the teraform.tf file.

• Apply the changes by writing terraform apply --auto-approve. It will remove the second repository from the GitHub.

• Open the first repository on GitHub and make some changes in it like change the description of it.

• If you open the terraform.tfstate file, you will see that the state of the GitHub repo and the state of terraform.tfstate are different.

• To make the state the same, write terraform refresh command and then to check the status of terraform.tfstate file. It will make both the states equal.

• Write terraform show command to show the output of resources in the terminal.

• Although both the states are same but the problem is that if you open terraform.tf file, the original text is still present. It means that if you apply the terraform, it will remove the newly created changes.

• In this way, if somebody made changes in your repository but you want the original text to be present then you can write the terraform plan to show you the changes. You will see that the new changes will be replaced with the original text.

• After seeing the changes, type terraform apply command. Now the changes will be reversed and back to the original text.

• If you open the terraform.tf file and delete the description and then type terraform plan command. It will show you the text that will be removed from the GitHub repository.

• Type terraform apply command and after applying, if you open the github repository, the description will be removed.

Terraform Output

• Open the terraform.tf file and write the following data into it.

  output "terraform-first-repo-url" {
          value = github_repository.terraform-first-repo.html_url
  }
  

• You can the find the attributes here.

• Once the attribute is added, write the terraform validate to first validate it, then write terraform plan command to see which things will be added.

• After that, write terraform apply --auto-approve command to apply it. Once it is applied, write terraform output. It will give you the output.

Terraform console

• Open the variable.tf file and write the following variables in it.

  variable "username" {
          default="bilal"
  }
  
  variable "age" {
          default = 23
  }
  
  variable "city" {
          default = "quetta"
  }
  

• After saving the file, close it and write terraform console command in the terminal.

• If you type, var.city, it will give you the city. If you type var.username, it will give you the username.

• If you type github_repository.terraform-first-repo.html_url, it will give you the output link.

• It will read the data from the current working directory that you have.

Terraform file indentation

• Open the terraform files and add spaces in the file.

• After adding spaces, if you go to the terminal and write terraform fmt, all the data will be formatted correctly.

Explaining it in a video

Here you can get an explanation in a video. 41/60 Day of DevOps Challenge