/terraform_tutorials

Configuration Files

  • variables.tf
  • outputs.tf
  • provider.tf
  • xyz.ftvars
  • xyz.auto.tfvars

Type of Provisioners

  • Officials
  • Partners
  • Community

Variables

  • variable.tf file
  • TF_VARS_filename
  • .tfvars
  • .auto.tfvars

Variable Precedence

  • Environment Variables
  • .tfvars file
  • .auto.tfvars
  • -var commandline

output

show on cmd after apply export to other system terraform output cmd

reference expression

${resource_type.lable.varname}

Implicite Dependancy

${resource_type.lable.varname}

explicite dependancy

  • depends_on = [] inside config file

Terraform State File .tfstate

  • order in which resources to be delete / depends on
  • performance / --refresh=false
  • reconcilation -- configuration drift
  • sensitive info

Terraform Basic Commands

  • init
  • plan
  • apply
  • destroy

Configuration Drift

terraform fmt

terraform refresh

terraform validate

Mutable Infrastructure

Topics

  • Infra as Code(IaC)

lifecycle rules

  • create before destroy
  • prevent destroy
  • ignore changes

Taint

-taint -untaint

Debugging

  • Log Levels TF_LOGS=TRACE
  • Env variables TF_LOGS_PATH="path"

Terraform IMPORT - existing infrastructure

  • only statefile will update

Terraform Modules

  • reuse configuration
  • module keyword
  • source argument
  • repository of module

Terraform Function

  • file()
  • length()
  • toset()
  • terraform console
  • Numeric function
  • String Function
  • Type Conversion Function
  • Collection Function
  • split(),join(),index(), element(), contains(),keys(),values(),lookup()

operators and Expression

Terraform Workshpaces