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June 17, 2026

Terragrunt at Scale: Dependency Graphs, Circular Deps & OCI Versioning

19 minutes

Managing a Terragrunt dependency graph across 500+ modules without hitting circular dependencies or version drift is one of the hardest scaling problems in platform engineering.

You'll learn:

How to map and audit a large Terragrunt dependency graph using terragrunt graph-dependencies and DAG visualisation tools

Patterns for structuring module hierarchies to prevent circular dependencies before they reach CI

Enforcing module versioning with OCI registries — why OCI beats Git tags at this scale

How to segment a 500+ module monorepo into dependency tiers so targeted runs stay fast

Common failure modes: implicit dependencies, missing mock_outputs, and run-all ordering bugs

Keywords: Terragrunt dependency graph, Terragrunt at scale, OCI module registry, circular dependencies Terraform, platform engineering IaC

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