terraform q&a - hashicorp user group oslo
TRANSCRIPT
HashiCorp User Group Oslo20.11.2017
https://meetup.com/Oslo-HashiCorp-User-Group/
Food sponsor:
Agenda - initial commit
1. About this user group2. Terraform questions & problems3. Terraform Q&A
Want to be a speaker?Send an email - [email protected]
About this user groupThis HashiCorp User Group Oslo is the place where interested people gather once every couple months to learn from each other about HashiCorp products— what we do, how we do it, and how can we do it differently. While I generally strive to make such meetups interesting for the participants, I am often against the repetitive talks which can be found online easily.
Latest editition: 20.11.2017
Anton Babenko,CEO at Betajob
linkedin.com/in/antonbabenkogithub.com/antonbabenko [email protected]
Keywords: All-5 AWS certified, DevOps, infrastructure as code, automation, open-source, community member and events organiser, Terraform modules, solution architectures, serverless.
About me
Featuring...
Read also - https://www.hashicorp.com/tao-of-hashicorp
Featuring...
Write, Plan, and Create Infrastructure as Code
Terraform 101 (main.tf)provider "aws" { region = "eu-west-1" }
resource "random_pet" "bucket" {}
resource "aws_s3_bucket" "app" { bucket = "hi-${random_pet .bucket.id}"
website { index_document = "index.html" }}
data "template_file" "index" { template = "${file("index.html")}"
vars { BUCKET = "${aws_s3_bucket .app.website_endpoint }" }}
resource "aws_s3_bucket_object" "object" { bucket = "${aws_s3_bucket .app.id}" key = "index.html" content = "${data.template_file .index.rendered}" etag = "${md5(data. template_file .index.rendered)}" content_type = "text/html" acl = "public-read"}
output "app_website_endpoint" { value = "${aws_s3_bucket .app.website_endpoint }"}
index.html can access:${BUCKET}
$ terraform init$ terraform plan$ terraform apply
Apply complete! Resources: 3 added, 0 changed, 0 destroyed.
Outputs:
app_website_endpoint = hi-feasible-basilisk.s3-website-eu-west-1.amazonaws.com
Frequent Terraform Questions (FTQ)
Why Terraform and not AWS CloudFormation/Azure ARM templates/Google Cloud Deployment Manager?
Terraform manages 70+ providers, has easier syntax (HCL), has native support for modules and remote states, has team-work features. Terraform is an open-source project (640 - AWS provider, 1100 - core).
https://medium.com/@piotrgospodarek/cloudformation-vs-terraform-990318d6a7de
https://cloudonaut.io/cloudformation-vs-terraform/
https://www.slideshare.net/AntonBabenko/continuously-delivering-infrastructure-using-terraform-and-packer-training-material
Tord P.: What is the point of using these tools if you’re running AWS only, e.g. isn’t Terraform just a an unnecessary abstraction, why not stick to CloudFormation?
Terraform manages 70+ providers, has easier syntax (HCL), has native support for modules and remote states, has team-work features. Terraform is an open-source project.
Abstractions (primitives and modules) are necessary and easily available (Terraform Registry).
What are the most common tools/solutions out there?● Terraform Module Registry to discover modules for common infrastructure
configurations for any provider - https://registry.terraform.io/ (I maintain verified AWS modules there)
● Thin wrapper for Terraform that provides extra tools for working with multiple Terraform modules - https://github.com/gruntwork-io/terragrunt
● Terraform linter for detecting errors that can not be detected by `terraform plan` - https://github.com/wata727/tflint
● Terraform version manager - https://github.com/kamatama41/tfenv
This list is much longer, really…
How to handle secrets in Terraform?1. Can you accept secrets to be saved in state file in plaintext? Probably not.
a. AWS IAM password & access secret keys - use PGP as keybase.iob. AWS RDS - set dummy password and change after DB is createdc. AWS RDS - use iam_database_authentication_enabled = trued. EC2 instance user-data + AWS KMS
2. Other options:a. Secure remote state location (S3 bucket policy, KMS key)
How to get started?1. Install and getting started - https://www.terraform.io/intro/getting-started/install.html 2. Get infrastructure modules from Terraform Registry. For example, AWS modules -
https://registry.terraform.io/modules/terraform-aws-modules 3. Follow instructions in README.md, check examples, open issues and pull requests.
Frequent Terraform Problems (FTP)
Upgraded Terraform version, and there is a breaking bug, so I want to rollback, but I can’t because state file has been upgraded already.
● State file should be versioned (!), download previous version of state file, run “terraform state push old_version.tfstate”
● Lock terraform version, lock module and providers version (new in 0.11)● Read upgrade guides and CHANGELOG.md files:
○ https://www.terraform.io/upgrade-guides/0-11.html○ https://github.com/hashicorp/terraform/blob/master/CHANGELOG.md○ https://github.com/terraform-providers/terraform-provider-aws/blob/master/CHANG
ELOG.md
What is your Terraform question or problem?
PS: Maybe something about testing? Versioning? Code structure? Working as a team? CI/CD? Automation? Integration with other tools? https://modules.tf/ ? Code
generation? Missing tools/features? Syntax sugar (features and types of variables)? How to contribute?
Thanks!https://www.terraform.io/
https://github.com/terraform-aws-modules/
https://www.slideshare.net/AntonBabenko/continuously-delivering-infrastructure-using-terraform-and-packer-training-material
https://github.com/arun-gupta/kubernetes-aws-workshop/issues/135 - "Add Terraform template for cluster creation”