Terraform

wikipedia:Terraform (software) (July 2014) is an open-source infrastructure as code software.

• Google trends: https://trends.google.com/trends/explore?date=all&q=Terraform

• Terraform Cloud (September 2019)
• Terraform Enterprise
• Terraform Module Registry (2017)
• Terraform Registry (2020)
• Google trends: https://trends.google.com/trends/explore?date=all&q=%2Fg%2F11g6bg27fp

Technical characteristics

• Hashicorp Configuration Language (HCL)2 based
• Types: strings, number, bool, list, maps, set, tuple, object, any and null (Terraform 0.12)

Supported platforms/providers

• AWS: AWS EKS, GCP, IBM Cloud, DigitalOcean, Azure: Azure Stack, AzureRM, OpenStack, ServiceNow, F5 Networks, Nutanix, Tecent Cloud, Helm, Oracle OCI, Brightbox, RightScale, Linode, SkyTap, UCloud, Hedvig, Zabbix, Rollbar

• terraform providers

Installation

• macOS: brew install terraform.
• Ubuntu: snap install terraform or snap install terraform-snap

• Linux:
  • sudo apt-get update && sudo apt-get install -y gnupg software-properties-common curl
  • curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo apt-key add -
  • sudo apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"
  • sudo apt-get -qq update && sudo apt-get install terraform && terraform -v

Ref: https://learn.hashicorp.com/tutorials/terraform/install-cli

Terraform commands

• terraform init
• terraform console
• terraform fmt
  • terraform fmt -check
• terraform validate
• terraform import
• terraform plan
• terraform apply
• terraform remote config
• terraform destroy
• terraform show
• terraform login
• terraform add (1.1.0, xx/2021)

• terraform graph

Common Terraform commands

• terraform --help

Activities

• Create you first AWS instances with Terraform tutorial: https://learn.hashicorp.com/tutorials/terraform/aws-build?in=terraform/aws-get-started
• Read Terraform blog: https://www.hashicorp.com/blog/category/terraform/
• Read Stackoverflow questions: https://stackoverflow.com/questions/tagged/terraform?tab=Votes
• Read Terraform: Up & Running, 2nd edition Early Release is now available! https://blog.gruntwork.io/terraform-up-running-2nd-edition-early-release-is-now-available-b104fc29783f
• Terraform, read files

Related terms

• HCL and HCL2
• count parameter for iterations
• length
• depends_on
• Terraform conditional expressions
• Heredocs
• Terraform functions: templatefile, join, output
• Remote state backends to manage Terraform state
• Terragrunt, Terraformer, terratest
• Releases: https://github.com/hashicorp/terraform/releases
• Terraform libvirt provider

• artifacts:reports:terraform
• Terraform Cloud Operator
• resource: https://www.terraform.io/docs/language/resources/index.html
• Terraform examples: Terraform: Hello world.tf
• Terraform data sources
• Splat expression
• Error: Invalid value for module argument

See also

• Terraform resources (AWS provider):

Net: aws vpc, IAM, aws_lb, 
EC2: aws_instance, aws_key_pair, aws_security_group, aws lb target group
RDS: aws_db_instance
ECS: aws_ecs_service, aws_appautoscaling_target, aws_appautoscaling_policy
 aws_cloudfront_distribution, aws_cloudfront_origin_access_identity, cidr_block, aws codedeploy app, aws_nat_gateway, aws_internet_gateway, aws_kms_key, aws_rds_cluster, ecs_task_definition, aws_subnet, aws db subnet group, aws_rds_cluster, aws_s3_bucket, aws_ecs_task_definition, aws codebuild source credential, aws_s3_bucket_Jump to_navigationJump_to_search, gitlab_deploy_token, aws_acm_certificate, aws_vpn_connection, aws_ec2_client_vpn_endpoint

• terraform [fmt | apply |show | state | init | plan | console | output | validate | destroy | refresh | push | debug | taint | import | providers | get | graph | workspaces | resource | login | --version | -var-file | state mv | state pull | state push | state replace-provider | state rm | tfe | terraform --help]
• Terraform, HCL, Providers, Modules, Resource, data sources, Backend: remote backends, Terraform Cloud, Terraform Enterprise, examples, configuration files, state files, output, variables, types, Terraform Registry, conditionals: depends_on, functions, splat expression, errors, Terragrunt, Terraformer, Terratest, Changelog, Terraform variable types
• IaC: Terraform, Chef, cdist, capistrano, Harrow, puppet, Ansible, CFEngine, Cloud Deployment Manager, pulumi, juju, SaltStack, Azure Resource Manager (ARM), Google Deployment Manager, AWS CloudFormation, Pulumi

https://www.hashicorp.com/blog/hashicorp-terraform-module-registry

https://www.hashicorp.com/blog/announcing-providers-in-the-new-terraform-registry

https://www.terraform.io/docs/commands/index.html