Strangler Fig Migrations: From Observability to Shutdown
Incrementally migrating to new infrastructure by building observability before cutting traffic. A complete walkthrough using auth extraction as the running example.
Incrementally migrating to new infrastructure by building observability before cutting traffic. A complete walkthrough using auth extraction as the running example.
- File type
- Pages
- 46 pages
- File size
- 2.0 MB
The strangler fig pattern trades big-bang risk for incremental progress by building the new system around the old one, shifting traffic slowly, and only decommissioning legacy when proven. The core insight: you can’t migrate what you can’t observe. Before touching any traffic, establish baselines for normal operation—metrics, response patterns, error rates. With strangler fig, each increment is a small bet. A failure at 5% traffic is containable; at 100% it becomes an outage. Big-bang migrations have single points of failure; strangler fig delivers value incrementally while you learn.
Auth extraction is the hardest extraction—if you can migrate auth, you can migrate anything.
This complete guide teaches you:
- Migration unit selection: service boundaries and endpoint-level increments
- Instrumentation: collecting baseline metrics before cutting any traffic
- Traffic splitting: routing strategies and percentage-based rollout
- Comparison testing: validating new system responses match legacy
- Incident response during migration: rollback triggers and circuit breakers
- Legacy decommissioning: cleanup, data archival, and final cutover
- Real-world walkthroughs: auth, payments, and reporting services
Download Your Strangler Fig Migration Guide now to migrate without big-bang risk.
Strangler Fig Migrations: From Observability to Shutdown
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