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A serverless backend for Terraform

Terraform offers several backend types. One of them is the http backend which stores Terraform states using a REST client.

This project provides an implementation of the REST backend using serverless IBM Cloud Functions and IBM Cloud Object Storage (COS) with optional state locking and versioning of Terraform states.

Step 1 - Prepare the backend

This first step creates:

  • a resource group,
  • a COS instance with a bucket,
  • Cloud Functions namespace, package and action.

It uses terraform to create the resources :)

create action and bucket

  1. Change to the step directory

    cd 010-prepare-backend

  2. Copy the terraform configuration

    cp terraform.tfvars.template terraform.tfvars

  3. Edit terraform.tfvars to match your environment

  4. Create the resources

    terraform init
terraform apply

    It creates the resources and generates a backend.env file in 020-use-backend with the backend address and password.

Step 2 - Test the backend

  1. Change to the step directory 
    cd 020-use-backend
  2. Load the backend configuration variables 
    source backend.env
  3. Test the backend 
    terraform init
terraform apply
  4. In IBM Cloud console,
    • go to the COS service instance,
    • select the bucket
    • find the dev.tfstate under states/named

Advanced configuration

You can configure the generated backend.env to suit your needs by changing the value of the env and versioning parameters or commenting the lock/unlock address to disable locking:

# TF_HTTP_ADDRESS points to the Cloud Functions action implementing the backend.
# It is reused for locking implementation too.
#
# env: name for the terraform state, e.g mystate, us/south/staging (.tfstate will be added automatically)
# versioning: set to true to keep multiple copies of the states in the storage
export TF_HTTP_ADDRESS="https://us-south.functions.cloud.ibm.com/api/v1/web/1234-5678/serverless-terraform-backend-package/backend?env=dev&versioning=true"
export TF_HTTP_PASSWORD="<COS-API-KEY>"

# comment the following variables to disable locking
export TF_HTTP_LOCK_ADDRESS=$TF_HTTP_ADDRESS
export TF_HTTP_UNLOCK_ADDRESS=$TF_HTTP_ADDRESS

License

This project is licensed under the Apache License Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0).