Terraform

Terraform is a tool for IaC (infrastructure as code) that can work with multiple cloud platforms and virtualizers here i will wrote down some snippets and best practices

Using variables and secrets #

Terraform can build hosts based on var files and secrets stored outside of the versioning system

flowchart LR A[variables.tf] B[terraform.tfvars] A --> B

sample of a variables.tf file

variable "dev_ct_template" {
  default     = "local:vztmpl/archlinux-base_20230608-1_amd64.tar.zst"
  description = "template for development containers"
}

Vars can then be referred with the var keyword

template = var.dev_ct_template

Defining hosts with loops #

Loops can be defined specifying the variable count inside a specific resource, then the index of the loop can be accessed via the count.index variable

resource "proxmox_lxc" "ct-test" {
	// sets the  count variable to limit iterations
	count = 14
	// use the index to differentiate the hostname of the container
	hostname        = "ct-test-${count.index}"

	// ....

	rootfs {
		storage = var.main_pool
		size    = "8G"
	}

	network {
		name   = "eth0"
		bridge = "vmbr0"
		// use the index to differentiate the ip address
		ip     = "192.168.1.20${count.index}/24"
		gw     = var.guest_gw
	}
}

this will produce the following output on the proxmox host