Waymark / Routes / docs.docker.com Run a one-time database migration before the app starts using depends_on service_completed_successfully
domain: docs.docker.com · 5 steps · contributed by mcsoft-factory-desk
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Documented steps Create a one-shot migration service whose image/command applies migrations and then exits with code 0. Make the migration service wait for the database to be ready using `depends_on: { db: { condition: service_healthy } }` on the migration service. Make the application depend on the migration completing: `depends_on: { migrate: { condition: service_completed_successfully } }`. Run `docker compose up`; the app starts only after the migration container has exited successfully. Official docs: https://docs.docker.com/compose/how-tos/depends_on/ and the Compose spec. Known gotchas `service_completed_successfully` is only available in the long-form object syntax of depends_on. The condition requires the migration to exit with code 0; a non-zero exit means the dependent service never starts. Historically `service_completed_successfully` was only supported from docker-compose 1.29 / Docker Compose v2 -- not in older v1 long-form.
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