Adding a New Provider to Your Configuration

Terraform Functions

• Built-in to Terraform
• Func_name(arg1, arg2, arg3, ...)
• Test in terrafrom console
• Several broad categories

Common Function Categories

• Numeric
  • min(42, 13, 7)
• String
  • lower("TACOS")
• Collection
  • merge(map1, map2)
• Filesystem
  • file(path)
• IP network
  • cidrsubnet()
• Date and time
  • timestamp()

Function Examples

#Configure networking
variable network_info {
default = "10.1.0.0/16" #type, default, description
}
#Returns 10.1.0.0/24
cidr_block = cidrsubnet(var.network_info, 8, 0)

#Returns 10.1.0.5
host_ip = cidrhost(var.network_info,5)

#Create ami map
variable "amis" {
  type = "map"
  default = {
    us-east-1 = "ami-1234"
    us-west-1 = "ami-5678"
  }
}
ami = lookup(var.amis, "us-east-1", "error")

Terraform Commands

m6_commands.txt

modulesix.tf

Terraform Providers

• Iaas, Paas, Saas
• Community and HashiCorp
• Open source
• Resources and data sources
• Multiple instances

Provider Example

provider "azurerm" {
subscription_id = "subscription-id"
client_id = "principal-used-for-access"
client_secret = "password-of-principal"
tenant_id = "tenant-id"
alias = "arm-1"
}
resource "azurerm_resource_group" "azure_tacos" {
name = "resource-group-name"
location = "East US"
provider = azurerm.arm-1
}

Adding the AzureRM Provider

modulesix.tf

Resource Arguments

• depends_on
• count
• for_each
• provider

Depends_on and Count

resource "aws_instance" "taco_servers" {
count = 2
tags {
Name = "customer-${count.index}"
}
depends_on = [aws_iam_role_policy.allow_s3]
}

For_each

resource "aws_s3_bucket" "taco_toppings" {
for_each = {
food = "public-read"
cash = "private"
}
bucket = "${each.key}-${var.bucket_suffix}"
acl = each.value
}

Using the Count Argument

modulesix.tf