IaC — Bicep vs Terraform for Azure Enterprise
Cloud Architecture
Both Bicep and Terraform deploy Azure resources. The choice is about team skills, state management, and multi-cloud ambitions. Here is how I evaluate and apply both in enterprise environments.
Key Patterns & Steps
- Bicep: Azure-native, no state file, tight ARM integration — ideal for Azure-only organisations with no prior Terraform investment
- Terraform: multi-cloud, HCL familiar to most DevOps engineers, rich provider ecosystem — better when AWS or GCP exist alongside Azure
- State management is Terraform's biggest operational burden — use remote state in Azure Storage with state locking from day one
- Bicep modules map cleanly to Azure landing zone building blocks; use them for platform team deployments
- Do not mix both in the same subscription without clear ownership boundaries — drift and confusion follow
- CI/CD: run terraform plan/bicep what-if in PR pipelines; apply only on merge to main with manual approval gate
Lessons Learned
The worst outcome is a half-migrated codebase — half Bicep, half Terraform, neither fully owned. Pick one per scope and enforce it via pipeline policy.
Technologies
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