Terraform

This post isn't really finished, but one day it might be useful.

infrastructure as code HashiCorp Terraform

examples/terraform/1/main.tf

provider "google" {
  project     = "project-name-1234"
  region      = "us-central1"
}

resource "google_compute_instance" "gabor" {
  name         = "gabor-1"
  machine_type = "f1-micro"
  zone         = "us-central1-a"

  boot_disk {
    initialize_params {
      image = "ubuntu-1804-lts"
    }
  }

  network_interface {
    subnetwork = "central1-resources"
  }
}

terraform init
terraform apply

examples/terraform/2/main.tf

provider "google" {
  project     = "project-name-12345"
  region      = "us-central1"
}

resource "google_compute_instance" "gabor" {
  name         = "gabor-${count.index + 1}"
  machine_type = "f1-micro"
  zone         = "us-central1-b"
  count        = "2"

  labels = {
    owner = "gabor"
    group = "devops"
  }

#  tags = ["access-external"]

  boot_disk {
    initialize_params {
      image = "ubuntu-1804-lts"
    }
  }

  network_interface {
    subnetwork = "central1-resources"
  }

  scheduling {
    preemptible  = false
    automatic_restart = false
  }
}

examples/terraform/count/main.tf

vars {
   total = 1
}

resource "google_compute_instance" "gabor" {
  name         = "gabor-${count.index + 1}"
  machine_type = "f1-micro"
  # get the available zones of the current region and get the number of them
  #count = "${length(data.google_compute_zones.available.names)}"
  # pick the zone from the array (we cannot have a count that is larger than the available zones)
  #zone         = "${data.google_compute_zones.available.names[count.index]}"

  # we can use modulus, but now the number of entries in the list of zones is hard-coded 4
  #count        = "10"
  #zone         = "${data.google_compute_zones.available.names[count.index % 4]}"

  #vars.total = "${length(data.google_compute_zones.available.names)}"
  count        = "10"
  zone         = "${data.google_compute_zones.available.names[count.index % ${vars.total} ]}"

  labels = {
    owner = "gabor"
    group = "devops"
  }
}

links

https://www.terraform.io/docs/configuration-0-11/interpolation.html#math

https://www.terraform.io/docs/configuration/resources.html

examples/terraform/google/main.tf

#variable "region" { default = "us-central1" }
variable "name" { }
variable "zone" { default = "us-central1-a" }

provider "google" {
 project     = "project-name-12345"
#  region      = "${var.region}"
}

resource "google_compute_instance" "gabor" {
 name         = var.name
 machine_type = "f1-micro"
 zone         = "${var.zone}"

 boot_disk {
   initialize_params {
     image = "ubuntu-1804-lts"
   }
 }

 network_interface {
   subnetwork = "gce-d-us-central1-indexing"
 }

 labels = {
   activity    = "temp"
   delete_at   = "never"
   group       = "devops"
   owner       = "gabor"
   start_at    = "never"
   stop_at     = "never"
 }

 connection {
     type     = "ssh"
     user     = "gabor"
     host     = var.name
 }

 provisioner "file" {
   source = "startup.sh"
   destination = "/home/gabor/startup.sh"
 }

 provisioner "remote-exec" {
   inline = [
      "chmod +x /home/gabor/startup.sh"
      #"apt-get update",
      #"apt-get install -y htop",
   ]
 }

 metadata = {
   "startup-script" : "/home/gabor/startup.sh"
 }
 #metadata_startup_script = "date >> /opt/test.txt"
}

examples/terraform/google/startup.sh

#!/bin/bash -x

date >> /home/gabor/startup.log

examples/terraform/google/dev.tfvars

name = "gabor-23"
zone = "us-central1-a"