Terraformer

CLI tool to generate tf and tfstate files from existing infrastructure (reverse Terraform).

• Disclaimer: This is not an official Google product.
• Status: beta - need improve documentations, bugs etc..
• Created by: Waze SRE.

Table of Contents

• Capabilities
• Installation
• Supported providers
  • Google Cloud
  • AWS
  • OpenStack
  • Kubernetes
  • Github
  • Datadog
• Contributing
• Developing
• Infrastructure

Capabilities

1. Generate tf + tfstate files from existing infrastructure for all supported objects by resource.
2. Remote state can be uploaded to a GCS bucket.
3. Connect between resources with terraform_remote_state (local and bucket).
4. Compatible with terraform 0.12 syntax.
5. Save tf files with custom folder tree pattern.
6. Import by resource name and type.

Terraformer use terraform providers and built for easy to add new supported resources. For upgrade resources with new fields you need upgrade only terraform providers.

Import current State to terraform configuration from google cloud

Usage:
   import google [flags]
   import google [command]

Available Commands:
  list        List supported resources for google provider

Flags:
  -b, --bucket string         gs://terraform-state
  -c, --connect                (default true)
  -f, --filter strings        google_compute_firewall=id1:id2:id4
  -h, --help                  help for google
  -o, --path-output string     (default "generated")
  -p, --path-pattern string   {output}/{provider}/custom/{service}/ (default "{output}/{provider}/{service}/")
      --projects strings
  -r, --resources strings     firewalls,networks
  -s, --state string          local or bucket (default "local")
  -z, --zone string

Permissions

Readonly permissions

Filtering

Filters are a way to choose which resources terraformer import.

Ex:

terraformer import aws --resources=vpc,subnet --filter=aws_vpc=myvpcid --regions=eu-west-1

will import only one VPC and not only subnets from this VPC but all subnets from all VPCs

Resources ID

Filtering is based on Terraform resource ID pattern. This way, it may differ from the value your provider give you. Check the import part of Terraform documentation for your resource for valid ID pattern.

Planning

plan command let you review the resources to import, rename them, or even filter only what you need.

The rest of subcommands and parameters are same to import command.

$ terraformer plan google --resources=networks,firewalls --projects=my-project --zone=europe-west1-d
(snip)

Saving planfile to generated/google/my-project/terraformer/plan.json

After reviewing/customizing the planfile, perform import by import plan command.

$ terraformer import plan generated/google/my-project/terraformer/plan.json

Installation

From source:

1. Run git clone <terraformer repo>
2. Run GO111MODULE=on go mod vendor
3. Run go build -v
4. Run terraform init against an init.tf installing the platform correct required plugin(s) relative to current directory. Example init.tf to install the Google cloud plugin:

provider "google" {}

Or alternatively

4. Copy your Terraform provider's plugin(s) to folder ~/.terraform.d/plugins/{darwin,linux}_amd64/, as appropriate.

From Releases:

• Linux

curl -LO https://github.com/GoogleCloudPlatform/terraformer/releases/download/$(curl -s https://api.github.com/repos/GoogleCloudPlatform/terraformer/releases/latest | grep tag_name | cut -d '"' -f 4)/terraformer-linux-amd64
chmod +x terraformer-linux-amd64
sudo mv terraformer-linux-amd64 /usr/local/bin/terraformer

• MacOS

curl -LO https://github.com/GoogleCloudPlatform/terraformer/releases/download/$(curl -s https://api.github.com/repos/GoogleCloudPlatform/terraformer/releases/latest | grep tag_name | cut -d '"' -f 4)/terraformer-darwin-amd64
chmod +x terraformer-darwin-amd64
sudo mv terraformer-darwin-amd64 /usr/local/bin/terraformer

Using package manager

If you want to use a package manager:

• Homebrew users can use brew install terraformer.

Links for download terraform providers:

• google cloud provider >2.0.0 - here
• aws provider >1.56.0 - here
• openstack provider >1.17.0 - here
• kubernetes provider >=1.4.0 - here
• github provider >=2.0.0 - here
• datadog provider >1.19.0 - here

Information on provider plugins: https://www.terraform.io/docs/configuration/providers.html

Use with GCP

Example:

terraformer import google --resources=gcs,forwardingRules,httpHealthChecks --connect=true --zone=europe-west1-a --projects=aaa,fff
terraformer import google --resources=gcs,forwardingRules,httpHealthChecks --filter=google_compute_firewall=rule1:rule2:rule3 --zone=europe-west1-a --projects=aaa,fff

List of supported GCP services:

• addresses
  • google_compute_address
• autoscalers
  • google_compute_autoscaler
• backendBuckets
  • google_compute_backend_bucket
• backendServices
  • google_compute_backend_service
• bigQuery
  • google_bigquery_dataset
  • google_bigquery_table
• schedulerJobs
  • google_cloud_scheduler_job
• disks
  • google_compute_disk
• firewalls
  • google_compute_firewall
• forwardingRules
  • google_compute_forwarding_rule
• globalAddresses
  • google_compute_global_address
• globalForwardingRules
  • google_compute_global_forwarding_rule
• healthChecks
  • google_compute_health_check
• httpHealthChecks
  • google_compute_http_health_check
• httpsHealthChecks
  • google_compute_https_health_check
• images
  • google_compute_image
• instanceGroupManagers
  • google_compute_instance_group_manager
• instanceGroups
  • google_compute_instance_group
• instanceTemplates
  • google_compute_instance_template
• instances
  • google_compute_instance
• interconnectAttachments
  • google_compute_interconnect_attachment
• memoryStore
  • google_redis_instance
• networks
  • google_compute_network
• nodeGroups
  • google_compute_node_group
• nodeTemplates
  • google_compute_node_template
• regionAutoscalers
  • google_compute_region_autoscaler
• regionBackendServices
  • google_compute_region_backend_service
• regionDisks
  • google_compute_region_disk
• regionInstanceGroupManagers
  • google_compute_region_instance_group_manager
• routers
  • google_compute_router
• routes
  • google_compute_route
• securityPolicies
  • google_compute_security_policy
• sslPolicies
  • google_compute_ssl_policy
• subnetworks
  • google_compute_subnetwork
• targetHttpProxies
  • google_compute_target_http_proxy
• targetHttpsProxies
  • google_compute_target_https_proxy
• targetInstances
  • google_compute_target_instance
• targetPools
  • google_compute_target_pool
• targetSslProxies
  • google_compute_target_ssl_proxy
• targetTcpProxies
  • google_compute_target_tcp_proxy
• targetVpnGateways
  • google_compute_vpn_gateway
• urlMaps
  • google_compute_url_map
• vpnTunnels
  • google_compute_vpn_tunnel
• gke
  • google_container_cluster
  • google_container_node_pool
• pubsub
  • google_pubsub_subscription
  • google_pubsub_topic
• dataProc
  • google_dataproc_cluster
• cloudFunctions
  • google_cloudfunctions_function
• gcs
  • google_storage_bucket
  • google_storage_bucket_acl
  • google_storage_default_object_acl
  • google_storage_bucket_iam_binding
  • google_storage_bucket_iam_member
  • google_storage_bucket_iam_policy
  • google_storage_notification
• monitoring
  • google_monitoring_alert_policy
  • google_monitoring_group
  • google_monitoring_notification_channel
  • google_monitoring_uptime_check_config
• dns
  • google_dns_managed_zone
  • google_dns_record_set
• cloudsql
  • google_sql_database_instance
  • google_sql_database
• kms
  • google_kms_key_ring
  • google_kms_crypto_key
• project
  • google_project

Your tf and tfstate files are written by default to generated/gcp/zone/service.

Use with AWS

Example:

 terraformer import aws --resources=vpc,subnet --connect=true --regions=eu-west-1
 terraformer import aws --resources=vpc,subnet --filter=aws_vpc=vpc_id1:vpc_id2:vpc_id3 --regions=eu-west-1

List of support AWS services:

• elb
  • aws_elb
• alb
  • aws_lb
  • aws_lb_listener
  • aws_lb_listener_rule
  • aws_lb_listener_certificate
  • aws_lb_target_group
  • aws_lb_target_group_attachment
• auto_scaling
  • aws_autoscaling_group
  • aws_launch_configuration
  • aws_launch_template
• rds
  • aws_db_instance
  • aws_db_parameter_group
  • aws_db_subnet_group
  • aws_db_option_group
  • aws_db_event_subscription
• iam
  • aws_iam_role
  • aws_iam_role_policy
  • aws_iam_user
  • aws_iam_user_group_membership
  • aws_iam_user_policy
  • aws_iam_policy_attachment
  • aws_iam_policy
  • aws_iam_group
  • aws_iam_group_membership
  • aws_iam_group_policy
• igw
  • aws_internet_gateway
• nacl
  • aws_network_acl
• s3
  • aws_s3_bucket
  • aws_s3_bucket_policy
• sg
  • aws_security_group
• subnet
  • aws_subnet
• vpc
  • aws_vpc
• vpn_connection
  • aws_vpn_connection
• vpn_gateway
  • aws_vpn_gateway
• route53
  • aws_route53_zone
  • aws_route53_record
• acm
  • aws_acm_certificate
• elasticache
  • aws_elasticache_cluster
  • aws_elasticache_parameter_group
  • aws_elasticache_subnet_group
  • aws_elasticache_replication_group
• cloudfront
  • aws_cloudfront_distribution
• ec2_instance
  • aws_instance

Use with OpenStack

Example:

 terraformer import openstack --resources=compute,networking --regions=RegionOne

List of support OpenStack services:

• compute
  • openstack_compute_instance_v2
• networking
  • openstack_networking_secgroup_v2
  • openstack_networking_secgroup_rule_v2
• blockstorage
  • openstack_blockstorage_volume_v1
  • openstack_blockstorage_volume_v2
  • openstack_blockstorage_volume_v3

Use with Kubernetes

Example:

 terraformer import kubernetes --resources=deployments,services,storageclasses
 terraformer import kubernetes --resources=deployments,services,storageclasses --filter=kubernetes_deployment=name1:name2:name3

All of the kubernetes resources that are currently being supported by kubernetes provider are supported by this module as well. Here is the list of resources which are currently supported by kubernetes provider v.1.4:

• clusterrolebinding
  • kubernetes_cluster_role_binding
• configmaps
  • kubernetes_config_map
• deployments
  • kubernetes_deployment
• horizontalpodautoscalers
  • kubernetes_horizontal_pod_autoscaler
• limitranges
  • kubernetes_limit_range
• namespaces
  • kubernetes_namespace
• persistentvolumes
  • kubernetes_persistent_volume
• persistentvolumeclaims
  • kubernetes_persistent_volume_claim
• pods
  • kubernetes_pod
• replicationcontrollers
  • kubernetes_replication_controller
• resourcequotas
  • kubernetes_resource_quota
• secrets
  • kubernetes_secret
• services
  • kubernetes_service
• serviceaccounts
  • kubernetes_service_account
• statefulsets
  • kubernetes_stateful_set
• storageclasses
  • kubernetes_storage_class

Known issues

• Terraform kubernetes provider is rejecting resources with ":" character in their names (As it's not meeting DNS-1123), while it's allowed for certain types in kubernetes, e.g. ClusterRoleBinding.
• As terraform flatmap is using "." to detect the keys for unflattening the maps, some keys with "." in their names are being considered as the maps.
• As the library is just assuming empty string as empty value (not "0"), there are some issues with optional integer keys that are restricted to be positive.

Use with Github

Example:

 ./terraformer import github --organizations=YOUR_ORGANIZATION --resources=repositories --token=YOUR_TOKEN // or GITHUB_TOKEN in env
 ./terraformer import github --organizations=YOUR_ORGANIZATION --resources=repositories --filter=github_repository=id1:id2:id4 --token=YOUR_TOKEN // or GITHUB_TOKEN in env

Support only organizations resources. List of supported resources:

• repositories
  • github_repository
  • github_repository_webhook
  • github_branch_protection
  • github_repository_collaborator
  • github_repository_deploy_key
• teams
  • github_team
  • github_team_membership
  • github_team_repository
• members
  • github_membership
• organization_webhooks
  • github_organization_webhook

Notes:

• Github API don't return webhook secrets. If you have secret in webhook, you get changes on terraform plan => configuration.#: "1" => "0" in tfstate only.

Use with Datadog

Example:

 ./terraformer import datadog --resources=monitor --api-key=YOUR_DATADOG_API_KEY // or DATADOG_API_KEY in env --app-key=YOUR_DATADOG_APP_KEY // or DATADOG_APP_KEY in env
 ./terraformer import datadog --resources=monitor --filter=datadog_monitor=id1:id2:id4 --api-key=YOUR_DATADOG_API_KEY // or DATADOG_API_KEY in env --app-key=YOUR_DATADOG_APP_KEY // or DATADOG_APP_KEY in env

List of support Datadog services:

• downtime
  • datadog_downtime
• monitor
  • datadog_monitor
• screenboard
  • datadog_screenboard
• synthetics
  • datadog_synthetics_test
• timeboard
  • datadog_timeboard
• user
  • datadog_user

Contributing

If you have improvements or fixes, we would love to have your contributions. Please read CONTRIBUTING.md for more information on the process we would like contributors to follow.

Developing

Terraformer built for easy to add new providers and not only cloud providers.

Process for generating tf + tfstate files:

1. Call GCP/AWS/other api and get list of resources.
2. Iterate over resources and take only ID (we don't need mapping fields!!!)
3. Call to provider for readonly fields.
4. Call to infrastructure and take tf + tfstate.

Infrastructure

1. Call to provider for refresh method and get all data.
2. Convert refresh data to go struct.
3. Generate HCL file - tf files.
4. Generate tfstate files.

All mapping of resource is made by providers and Terraform. Upgrades are needed only for providers.

GCP compute resources

For GCP compute resources, use generated code from providers/gcp/gcp_compute_code_generator.

To regenerate code:

go run providers/gcp/gcp_compute_code_generator/*.go

Similar projects

1. https://github.com/dtan4/terraforming