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An apply ran in an order that broke the deploy. How does Terraform decide ordering, and where does depends_on fit?

Everyone recites that depends_on forces ordering. The stronger half of the answer is the graph you never see: implicit edges from references, why file layout orders nothing, and what explicit edges cost.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Everyone recites that depends_on forces ordering. The stronger half of the answer is the graph you never see: implicit edges from references, why file layout orders nothing, and what explicit edges cost.

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UP NEXT ON YOUR JOURNEY
Next in this trackYou spot a local-exec provisioner in a production Terraform module. Make the case for keeping or killing it.Next in this trackPick and defend a remote state backend for a 40-engineer platform. Compare the realistic options.Next in this trackTrace a database password from your Terraform pipeline to the resource. Where can it leak, and what closes each hole?
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