The document discusses the use of Terraform to build and manage infrastructures, particularly focusing on creating and modifying DigitalOcean droplets. It includes detailed Terraform configurations for setting up virtual machines, managing resources, and applying changes to the infrastructure. The document also emphasizes the importance of maintaining the state of the infrastructure and using provisioners for deployment tasks.

1. Using Terraform.io
Build & Change an Infrastructure with Terraform
2014/09/09

2. `whoami`
@sjourdan
@greenalto

3. Vagrant?

4. Vagrant
For development environments

5. Vagrant
Mimic production environments

6. Vagrant
!sharing
!durability
!evolution
!services
!production

7. Terraform

8. Terraform
Infrastructure?
servers, VMs (EC2, DigitalOcean…)
services (Heroku, ELB, EIP…)
DNS (DNSimple,…)
email (Mailgun…)

9. Terraform

10. Terraform

11. Terraform
APIs

12. Terraform

13. Terraform
Launch infrastructure
Change infrastructure

14. Terraform
Simple file based configuration

15. 5 days since CoreOS on DO

16. Terraform
resource "digitalocean_droplet" "coreos-1" {
}

17. Terraform
resource "digitalocean_droplet" "coreos-1" {
name = “coreos-1”
}

18. Terraform
resource "digitalocean_droplet" "coreos-1" {
name = “coreos-1”
size = "512mb"
}

19. Terraform
resource "digitalocean_droplet" "coreos-1" {
name = “coreos-1”
size = “512mb"
image = "coreos-alpha"
}

20. Terraform
resource "digitalocean_droplet" "coreos-1" {
name = “coreos-1”
size = “512mb"
image = “coreos-alpha"
region = "nyc3"
}

21. Terraform
resource "digitalocean_droplet" "coreos-1" {
name = “coreos-1”
size = “512mb"
image = “coreos-alpha"
region = “nyc3"
private_networking = true
}

22. Terraform
resource "digitalocean_droplet" "coreos-1" {
name = “coreos-1”
size = “512mb"
image = “coreos-alpha"
region = “nyc3"
private_networking = true
ssh_keys = [ "131228" ]
}

23. Terraform
$ terraform apply

24. Terraform
$ terraform apply
digitalocean_droplet.ht-coreos-1: Creating...
image: "" => "coreos-alpha"
name: "" => "ht-coreos-1"
private_networking: "" => "true"
region: "" => "nyc3"
size: "" => "512mb"
ssh_keys.#: "" => "1"
ssh_keys.0: "" => "131228"
digitalocean_droplet.ht-coreos-1: Creation complete
!
Apply complete! Resources: 1 added, 0 changed, 0 destroyed.
!
The state of your infrastructure has been saved to the path
below. This state is required to modify and destroy your
infrastructure, so keep it safe. To inspect the complete state
use the `terraform show` command.
!
State path: terraform.tfstate

25. Terraform
$ terraform show terraform.tfstate

26. Terraform
$ terraform show terraform.tfstate
digitalocean_droplet.ht-coreos-1:
id = 2574081
image = coreos-alpha
ipv4_address = 104.131.47.30
ipv4_address_private = 10.132.241.137
locked = false
name = ht-coreos-1
private_networking = true
region = nyc3
size = 512mb
ssh_keys.# = 1
ssh_keys.0 = 131228
status = active

27. Terraform

28. Terraform
Scale? Handle Change?

29. Terraform

30. Terraform
$ terraform plan

31. Terraform
$ terraform plan -out=terraform.plan
!
+ digitalocean_droplet.ht-coreos-2
!
[…]
!
+ digitalocean_droplet.ht-coreos-3
[…]

32. Terraform
$ terraform apply
digitalocean_droplet.ht-coreos-1: Refreshing
state... (ID: 2574081)
digitalocean_droplet.ht-coreos-2: Creating...
[…]
digitalocean_droplet.ht-coreos-3: Creating...
[…]
digitalocean_droplet.ht-coreos-3: Creation complete
digitalocean_droplet.ht-coreos-2: Creation complete
!
Apply complete! Resources: 2 added, 0 changed, 0
destroyed.

33. Terraform

34. Terraform
Downscale ?

35. Terraform
$ terraform plan -out=terraform.plan
!
[…]
- digitalocean_droplet.ht-coreos-1

36. Terraform
$ terraform apply
digitalocean_droplet.ht-coreos-1: Refreshing
state... (ID: 2574081)
digitalocean_droplet.ht-coreos-3: Refreshing
state... (ID: 2574214)
digitalocean_droplet.ht-coreos-2: Refreshing
state... (ID: 2574215)
digitalocean_droplet.ht-coreos-1: Destroying...
digitalocean_droplet.ht-coreos-1: Destruction
complete
!
Apply complete! Resources: 0 added, 0 changed, 1
destroyed.

37. Terraform

38. Terraform

39. Terraform
terraform.tfstate
=> git pull your infrastructure state!

40. Terraform

41. Terraform

42. Terraform
Provisionners
echo, cat or grep
myapp.conf
Chef, Puppet, Ansible, whatever

43. Terraform
provisioner "remote-exec" {
inline = [
"curl -L https://www.opscode.com/chef/
install.sh | sudo bash",
"sudo chef-solo -j chef/node.json"
]
}

44. Terraform
resource "dnsimple_record" “cluster-1" {
domain = “humantalks.com"
name = "cluster-1"
value = “${digitalocean_droplet.web.ipv4_address}"
type = "A"
}

45. Terraform
autoscaling_group
db_instance
security_group
eip
elb
instance
route53
s3
…

46. Terraform (Sept. 2014)

47. Terraform
2014/07/28: 0.1.0
2014/08/28: 0.2.0

48. Terraform
https://github.com/hashicorp/terraform/
http://www.terraform.io/

49. Q&A
Questions ?