Terraform

Sharing Modules

• Modules can be shared with others using
  • network drives (nfs)
  • git
  • Terraform Cloud

Lets create a Module Repository

• We have create a Module repo with one module to create virtual network Refer Here
• This module is hosted on github Refer Here for url

Lets use this module

• Refer Here for the changes done
• We have used the module
  • by using a source with reference to a tag and subfolder in git repo source = "github.com/dummyrepos/lttfmodules//azure/vnet?ref=v1.0.1"
  • configured azurerm backend
• Exercise: use the module to create 4 subnets in your azure account using module at https://github.com/dummyrepos/lttfmodules

Multiple Environment Creation

• When terraform template is configured with a backend it allows only one user to execute and stores the state in remote location
• Now lets assume we have a usecase, where we are using the same template for multiple environments then backend is not enough
• Generally template refers to one enivornment, (apply => environment)
• To handle multiple environments from same template and same folder with same backend terraform uses workspaces.
• Terraform workspaces are enabled by default, if your are not using workspaces you are indirectly using default workspace.

Best Practices for multiple environments

• Create a backend
• Create a tfvars file per environment
• create workspaces with names equivlaent to your environments (dev, qa, staging, prod)
• Now from CI/CD pipelines select the workspace post init and apply using a tfvars file using auto apporove
• Ideally terraform template should call reusable modules
• Ensure lint and security scans are followed and errors are fixed.

Exercise:

• Learn markdown format to document your modules.