Lightning Talk: Seamless at Scale: Migrating from Terraform to OpenTofu Without Mis...
summary
Fidelity migrates thousands of Terraform projects to OpenTofu over about a year using a five‑phase plan: POC, lighthouse project pushed to production, enablement, opt‑in adoption, then flipping the default CLI. Key metrics: 2,000+ applications, 50,000+ state files and ~4 million resources, ~4,000 daily applies and 70% opt‑in adoption before cutover. Most work centers on CI/CD changes and CLI/version consolidation, supported by a Bento catalog of reusable modules, Backstage registration, reporting dashboards and targeted onboarding of heavy Terraform users.
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chapters (14)
- 0:00Introduction
- 1:48Fidelity’s cloud infrastructure and Terraform scale
- 3:37Five-phase migration overview
- 4:00Proof of concept and lighthouse project
- 5:02Socializing migration with decision makers
- 5:45Enablement and tooling preparation
- 6:28Adoption tracking and early adopters
- 7:10Default CLI switch and consolidation
- 8:14Three tips for large-scale migrations
- 9:57Transparent progress reporting
- 11:01Summary and lessons learned
- 11:22Q&A: Evangelism and adoption
- 13:08Q&A: Shared infrastructure and modules
- 14:34Q&A: Migration reasons
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