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devops:terraform [2023/10/14 06:34] – skipidardevops:terraform [2024/04/03 19:53] (current) – skipidar
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 ===== Terraform ===== ===== Terraform =====
 +
 +===Debugging===
 +
 +
 +<sxh shell>
 +# https://developer.hashicorp.com/terraform/internals/debugging
 +# investigage errors
 +export TF_LOG="TRACE"
 +export TF_LOG_PATH="./terraform.log"
 +</sxh>
  
 ===Glossary=== ===Glossary===
Line 122: Line 132:
  
 === Data === === Data ===
 +
 +When you define ''data'' blocks Terraform communicates with the **AWS provider** to query AWS and fetch the list of requested resources, mentioned in data-block.
 +
 +<sxh json>
 +
 +</sxh>
 +
 +You can apply filters.
 +
 +<sxh json>
 +
 +# Find the latest available AMI that is tagged with Component = web
 +data "aws_ami" "web" {
 +  filter {
 +    name   = "state"
 +    values = ["available"]
 +  }
 +
 +  filter {
 +    name   = "tag:Component"
 +    values = ["web"]
 +  }
 +
 +  most_recent = true
 +}
 +</sxh>
 +
  
 Create **templates.tf** Create **templates.tf**
Line 160: Line 197:
 } }
 </sxh> </sxh>
 +
 +
 +=== Dynamic block ===
 +
 +See https://spacelift.io/blog/terraform-dynamic-blocks
 +
 +To replace the repetitive code as here in a module:
 +<sxh json>
 +resource "azurerm_virtual_network" "dynamic_block" {
 +  name                = "vnet-dynamicblock-example-centralus"
 +  resource_group_name = azurerm_resource_group.dynamic_block.name
 +  location            = azurerm_resource_group.dynamic_block.location
 +  address_space       = ["10.10.0.0/16"]
 +
 +  subnet {
 +    name           = "snet1"
 +    address_prefix = "10.10.1.0/24"
 +  }
 +
 +  subnet {
 +    name           = "snet2"
 +    address_prefix = "10.10.2.0/24"
 +  }
 +
 +  subnet {
 +    name           = "snet3"
 +    address_prefix = "10.10.3.0/24"
 +  }
 +
 +  subnet {
 +    name           = "snet4"
 +    address_prefix = "10.10.4.0/24"
 +  }
 +}
 +</sxh>
 +
 +
 +Use the "dynamic" block
 +
 +<sxh json>
 +resource "azurerm_virtual_network" "dynamic_block" {
 +  name                = "vnet-dynamicblock-example-centralus"
 +  resource_group_name = azurerm_resource_group.dynamic_block.name
 +  location            = azurerm_resource_group.dynamic_block.location
 +  address_space       = ["10.10.0.0/16"]
 +
 +  dynamic "subnet" {
 +    for_each = var.subnets
 +    iterator = item   #optional
 +    content {
 +      name           = item.value.name
 +      address_prefix = item.value.address_prefix
 +    }
 +  }
 +}
 +
 +</sxh>
 +
 +
 +Declare a variable in your module
 +<sxh json>
 +variable "subnets" {
 +  description = "list of values to assign to subnets"
 +  type = list(object({
 +    name           = string
 +    address_prefix = string
 +  }))
 +}
 +</sxh>
 +
 +
 +**USAGE of your module**
 +
 +Assigning values to the variable "subnets", which are taken by the module above.
 +
 +<sxh json>
 +subnets = [
 +  { name = "snet1", address_prefix = "10.10.1.0/24" },
 +  { name = "snet2", address_prefix = "10.10.2.0/24" },
 +  { name = "snet3", address_prefix = "10.10.3.0/24" },
 +  { name = "snet4", address_prefix = "10.10.4.0/24" }
 +]
 +</sxh>
 +
devops/terraform.1697265277.txt.gz · Last modified: by skipidar