Infrastructure as Code with Terraform
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This document discusses using Terraform for infrastructure as code. Terraform allows defining and provisioning infrastructure in a code-driven way using declarative configuration files rather than manual activity. It supports versioning and automation of infrastructure changes. The document provides an example of using Terraform with AWS to define a VPC, subnets, route tables and EC2 instances in HashiCorp Configuration Language (HCL). It also discusses using Terraform modules, state management, targeting specific resources and filtering data from providers.
![Filters data
• No more aws cli
• No more tags
• No more tricks
• Use:
data "aws_ami" "ami" {
most_recent = true
filter {
name = "name"
values = ["${var.ami_name}"]
}
filter {
name = "virtualization-type"
values = ["hvm"]
}
}
"${data.aws_ami.ami.id}"](https://image.slidesharecdn.com/infrastructureascodewithterraform-170403200858/85/Infrastructure-as-Code-with-Terraform-16-320.jpg)
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Infrastructure as Code with Terraform
- 1. Infrastructure As Code with Terraform by Mario Inga C. @mario21ic
- 2. Who am I? • Mario J. Inga Cahuana • Software Developer • Job: DevOps en Yarkan • Music: Metal m/ • https://github.com/mario21ic
- 3. The problem • Environment like Prod • Replication • Fragile • Versioning • Documentation
- 4. Terraform • Execution plans • Resource graph • Change automation • Agnostic • HCL is the HashiCorp configuration language. • Development with Go https://github.com/hashicorp/terraform
- 5. Example provider "aws" { region = "${var.region}" } resource "aws_vpc" "vpc" { cidr_block = "${var.vpc_cidr}" instance_tenancy = "default" enable_dns_support = true enable_dns_hostnames = true }
- 6. Providers • IaaS (e.g. AWS, GCP, Azure, OpenStack), PaaS (e.g. Heroku), or SaaS (e.g. Atlas, DNSimple, Cloudflare). • https://www.terraform.io/docs/providers/
- 7. Provisioners • Used to execute scripts on a local or remote machine as part of resource creation or destruction. • Can be used to bootstrap a resource, cleanup before destroy, run configuration management, etc. • There are: chef, connection, file, local-exec, remote-exec, null_resource
- 8. Demo • 1 VPC • 1 Route Table • 4 Subnets: 2 publics and 2 privates • 2 Zones • 2 EC2 • Move to another region
- 9. Demo
- 11. HCL - Provider
- 12. HCL - Resource
- 13. Stacks • Plan: • plan • plan -destroy • Create / Modify: apply • Read: show • Delete: destroy
- 14. State • Generate files: • terraform.tfstate • terraform.tfstate.backup
- 15. Targets • Plan: • terraform plan -target=module.vpc • terraform plan -destroy -target=module.vpc • Destroy • terraform destroy -target=module.vpc • Show • terraform show -target=module.vpc
- 16. Filters data • No more aws cli • No more tags • No more tricks • Use: data "aws_ami" "ami" { most_recent = true filter { name = "name" values = ["${var.ami_name}"] } filter { name = "virtualization-type" values = ["hvm"] } } "${data.aws_ami.ami.id}"
- 17. Variables input file • Default: terraform.tfvars • Alternative: -var-file="dev.tfvars" region = "eu-west-1" name = "dev" # VPC vpc_cidr = "10.0.0.0/16"
- 18. All files in one • main.tf • data.tf • provider.tf • variables.tf • terraform.tfvars • outputs.tf
- 19. Environments • List: $ terraform env list • Create $ terraform env new dev • Select $ terraform env select dev
- 20. Module • DRY, Don't Repeat Yourself • Supports: • Local file paths • Github • Bitbucket • Http urls • S3
- 21. Module • Download: terraform get -update=true module "vpc" { source = "github.com/mario21ic/terraform-aws-vpc" region = "${var.region}" name = “${var.name}" … }
- 22. Recomendaciones • Automatizar todo lo que se pueda y deba. • Usa un storage para los states • No existe la bala de plata • La nube no la controlamos al 100%, ejem: la caída de Aws S3 • Es mejor tener un plan a no tener ninguno
- 23. Material • https://github.com/mario21ic/infrastructure-as-code- terraform-aws • https://www.terraform.io/docs/ • Ebooks: • The Terraform Book - James Turnbull https://terraformbook.com • Terraform up & running - Yevgeniy Brikman http://shop.oreilly.com/product/0636920061939.do