Problem with Backends

• If we use the backends using same template for managing different environmets will be tricky.
• When user 1 tries update Dev it should not stop user 2 to update QA environments
  
• The basic idea is to use the same template across environments
• Terraform has workspaces

Terraform workspaces

• Refer Here for workspaces docs and Refer Here for terraform workspaces cli
• Terraform by default assumes the current workspace is default
  
• Lets create a workspace called as dev by user 1
  
• Refer Here for changes done
• Now lets create dev environment and apply the changes from user1 and created the qa environment and apply the changes from user 2.
• Terraform will allow both the users to create in parallel.
  
• Used conditional expression for creating a bastion subnet in qa Refer Here for changes and Refer Here for conditional expressions in terraform
• Terraform allows multiple environments from one template with workspaces

Problem

• Refer Here for the change which used count to create three files
• Now lets make a small change Refer Here where the second item from list is removed
• now apply to see the plan
  
• Terraform is deleting test2.txt and test3.txt also and then creates test3.txt again to maintain state
• To solve this problem we can use for_each Refer Here
• Exercise: Try solving the above problem with for_each

Interpolation in terraform

• Interpolation can be acheived by using format function or ${var} expresssion