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A CLI tool that generates tf/json and tfstate files based on existing infrastructure
(reverse Terraform).
tf/json + tfstate files from existing infrastructure for all
supported objects by resource.terraform_remote_state (local and bucket).tf/json files using a custom folder tree pattern.Terraformer uses Terraform providers and is designed to easily support newly added resources. To upgrade resources with new fields, all you need to do is upgrade the relevant Terraform providers.
Import current state to Terraform configuration from a provider
Usage:
import [provider] [flags]
import [provider] [command]
Available Commands:
list List supported resources for a provider
Flags:
-b, --bucket string gs://terraform-state
-c, --connect (default true)
-С, --compact (default false)
-x, --excludes strings firewalls,networks
-f, --filter strings compute_firewall=id1:id2:id4
-h, --help help for google
-O, --output string output format hcl or json (default "hcl")
-o, --path-output string (default "generated")
-p, --path-pattern string {output}/{provider}/ (default "{output}/{provider}/{service}/")
--projects strings
-z, --regions strings europe-west1, (default [global])
-r, --resources strings firewall,networks or * for all services
-s, --state string local or bucket (default "local")
-v, --verbose verbose mode
-n, --retry-number number of retries to perform if refresh fails
-m, --retry-sleep-ms time in ms to sleep between retries
Use " import [provider] [command] --help" for more information about a command.
The tool requires read-only permissions to list service resources.
You can use --resources parameter to tell resources from what service you want to import.
To import resources from all services, use --resources="*" . If you want to exclude certain services, you can combine the parameter with --excludes to exclude resources from services you don't want to import e.g. --resources="*" --excludes="iam".
Filters are a way to choose which resources terraformer imports. It's possible to filter resources by its identifiers or attributes. Multiple filtering values are separated by :. If an identifier contains this symbol, value should be wrapped in ' e.g. --filter=resource=id1:'project:dataset_id'. Identifier based filters will be executed before Terraformer will try to refresh remote state.
Use Type when you need to filter only one of several types of resources. Multiple filters can be combined when importing different resource types. An example would be importing all AWS security groups from a specific AWS VPC:
terraformer import aws -r sg,vpc --filter Type=sg;Name=vpc_id;Value=VPC_ID --filter Type=vpc;Name=id;Value=VPC_ID
Notice how the Name is different for sg than it is for vpc.
For terraform >= 0.13, you can use replace-provider to migrate state from previous versions.
Example usage:
terraform state replace-provider -auto-approve "registry.terraform.io/-/aws" "hashicorp/aws"
Filtering is based on Terraform resource ID patterns. To find valid ID patterns for your resource, check the import part of the Terraform documentation.
Example usage:
terraformer import aws --resources=vpc,subnet --filter=vpc=myvpcid --regions=eu-west-1
Will only import the vpc with id myvpcid. This form of filters can help when it's necessary to select resources by its identifiers.
It is possible to filter by specific field name only. It can be used e.g. when you want to retrieve resources only with a specific tag key.
Example usage:
terraformer import aws --resources=s3 --filter="Name=tags.Abc" --regions=eu-west-1
Will only import the s3 resources that have tag Abc. This form of filters can help when the field values are not important from filtering perspective.
It is possible to filter by a field that contains a dot.
Example usage:
terraformer import aws --resources=s3 --filter="Name=tags.Abc.def" --regions=eu-west-1
Will only import the s3 resources that have tag Abc.def.
The plan command generates a planfile that contains all the resources set to be imported. By modifying the planfile before running the import command, you can rename or filter the resources you'd like to import.
The rest of subcommands and parameters are identical to the import command.
$ terraformer plan google --resources=networks,firewall --projects=my-project --regions=europe-west1-d
(snip)
Saving planfile to generated/google/my-project/terraformer/plan.json
After reviewing/customizing the planfile, begin the import by running import plan.
$ terraformer import plan generated/google/my-project/terraformer/plan.json
Terraformer by default separates each resource into a file, which is put into a given service directory.
The default path for resource files is {output}/{provider}/{service}/{resource}.tf and can vary for each provider.
It's possible to adjust the generated structure by:
--compact parameter to group resource files within a single service into one resources.tf file--path-pattern parameter and passing e.g. --path-pattern {output}/{provider}/ to generate resources for all services in one directoryIt's possible to combine --compact --path-pattern parameters together.
Both Terraformer and a Terraform provider plugin need to be installed.
From a package manager
brew install terraformer.sudo port install terraformer.choco install terraformer.From releases
This installs all providers, set PROVIDER to one of google, aws or kubernetes if you only need one.
export PROVIDER=all
curl -LO "https://github.com/GoogleCloudPlatform/terraformer/releases/download/$(curl -s https://api.github.com/repos/GoogleCloudPlatform/terraformer/releases/latest | grep tag_name | cut -d '"' -f 4)/terraformer-${PROVIDER}-linux-amd64"
chmod +x terraformer-${PROVIDER}-linux-amd64
sudo mv terraformer-${PROVIDER}-linux-amd64 /usr/local/bin/terraformer
export PROVIDER=all
curl -LO "https://github.com/GoogleCloudPlatform/terraformer/releases/download/$(curl -s https://api.github.com/repos/GoogleCloudPlatform/terraformer/releases/latest | grep tag_name | cut -d '"' -f 4)/terraformer-${PROVIDER}-darwin-amd64"
chmod +x terraformer-${PROVIDER}-darwin-amd64
sudo mv terraformer-${PROVIDER}-darwin-amd64 /usr/local/bin/terraformer
From source
git clone <terraformer repo> && cd terraformer/
go mod download
go build -v for all providers OR build with one provider
go run build/main.go {google,aws,azure,kubernetes,etc}
Create a working folder and initialize the Terraform provider plugin. This folder will be where you run Terraformer commands.
Run terraform init against a versions.tf file to install the plugins required for your platform. For example, if you need plugins for the google provider, versions.tf should contain:
terraform {
required_providers {
google = {
source = "hashicorp/google"
}
}
required_version = ">= 0.13"
}
Or, copy your Terraform provider's plugin(s) from the list below to folder ~/.terraform.d/plugins/, as appropriate.
Links to download Terraform provider plugins:
Information on provider plugins: https://www.terraform.io/docs/configuration/providers.html
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.
Terraformer was built so you can easily add new providers of any kind.
Process for generating tf/json + tfstate files:
tf/json files.tfstate files.All mapping of resource is made by providers and Terraform. Upgrades are needed only for providers.
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
Terraforming gets all attributes from cloud APIs and creates HCL and tfstate files with templating. Each attribute in the API needs to map to attribute in Terraform. Generated files from templating can be broken with illegal syntax. When a provider adds new attributes the terraforming code needs to be updated.
Terraformer instead uses Terraform provider files for mapping attributes, HCL library from Hashicorp, and Terraform code.
Look for S3 support in terraforming here and official S3 support Terraforming lacks full coverage for resources - as an example you can see that 70% of S3 options are not supported:
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