Cost Estimation

Cost Estimation for infrastructure resources can be included in Environment Manager through the use of Infracost as a hook within EM Resource Templates.

Create Image¶

You will first need to create a custom Infracost container image that will be run within your Environment Manager Agent during Environment build operations. This container will be used to estimate the infrastructure costs of the EM environment resources. This image is based off of the official Infracost image.

Save the following script as cost.sh

cd /tmp
curl -H "X-Engine-Helper-Token:$DOWNLOAD_TOKEN" -o ./job.tar.zst $DOWNLOAD_URL
unzstd ./job.tar.zst
mkdir terraform
tar -xf job.tar -C ./terraform
ls -al ./terraform
infracost breakdown --path ./terraform/$TF_PATH

Save the following docker file as Dockerfile

FROM infracost/infracost:ci-0.10

COPY cost.sh /
RUN chmod +x /cost.sh

RUN apk add zstd

ENTRYPOINT ["ash","/cost.sh"]

Use the Docker CLI to build the image

docker build -t <docker hub username>/infracost:1.0 .

Push the image to a repository. The below command pushes to Docker Hub

docker push <docker hub username>/infracost:1.0

Create Infracost Context¶

You will need to create a configuration context in Environment Manager to store your Infracost API key. The API key will be stored securely and passed to the Infracost container as needed.

In the Rafay console:

Navigate to Environments -> Contexts
Click New Config Context
Enter infracost for the name
Click Create

Context

Navigate to Environment Variables
Click Add Environment Variable
Enter INFRACOST_API_KEY for the environment key
Enter your API key for the value
Select Sensitive
Click Save

Context

Your API key can be obtained under Org Settings in your Infracost account.

Configure Hooks¶

You will add a hook to each resource in the environment where cost estimation is needed

In the Rafay console:

Navigate to Environments -> Resource Templates
Locate and select the resource template for the resource where the hook will be added
Click New Version
Navigate to Hooks -> Terraform Hooks -> Plan
Click Add Hook
Enter infracost for the name
Select Before
Select Container for the hook type
Enter 100 for the CPU limit
Enter the image location of the image you pushed earlier
Enter 500 for the memory limit
Enter /infracost/ for the working directory path
Enter the following success condition

if #status.container.exitCode == 0 {
                            success: true
                        }
                        if #status.container.exitCode != 0  {
                            failed: true
                        }

Click Add Environment Variable
Enter DOWNLOAD_TOKEN for the key
Enter $(resource."<resource template name>".artifact.workdir.token)$ for the value being sure to update the resource template name
Click Add Environment Variable
Enter DOWNLOAD_URL for the key
Enter $(resource."<resource template name>".artifact.workdir.url)$ for the value being sure to update the resource template name
Click Add Environment Variable
Enter TF_PATH for the key
Enter the path of the Terraform code of the resource for the value (ex. aws/resources/vpc-ec2)
Click Save Changes

Hook

In the resource template, navigate to Config Contexts
Click Add Config Context
Select the previously created infracost context
Click Save as Active Version

Hook

Verify Configuration¶

You can view the cost estimation of a resource by viewing the Infracost activity of the resource in the run of an environment the resource is part of. An illustrative example is shown below.

Cost Estimate