Automating Terraform security in Scalr deployments with Regula [Tutorial]

Regula, an open-source policy-as-code tool maintained by Fugue engineers and now associated with Snyk IaC, scans Terraform, CloudFormation, Azure Resource Manager, and Kubernetes configurations for security and compliance issues, including policies mapped to CIS benchmarks. The post demonstrates integrating Regula with Scalr, a Terraform automation and collaboration platform, to prevent insecure infrastructure from being deployed by running Regula as a pre-plan custom hook and Terraform formatting and validation checks after planning. Using intentionally vulnerable AWS S3 Terraform code, it shows how Regula identifies issues such as missing server-side encryption, reports severity, rule IDs, affected files, and remediation links, and blocks the Scalr pipeline through a nonzero exit code until violations are resolved. It also explains that teams can waive rules for individual resources or disable rules when operational requirements justify exceptions. After developers correct the configuration and recommit changes, Scalr reruns the hooks and, if they pass, completes Terraform plan and apply operations while managing state, illustrating an automated workflow for embedding IaC security checks into Terraform deployments.

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