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docs/docker.en.md

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+Setup with Docker Compose :whale:
+================================================================
+
+The Compose environment builds Misskey with Node.js 22 and starts the app,
+MongoDB 4.4, and Redis 7 as separate services.
+
+From the repository root, run:
+
+``` console
+$ docker compose up --build
+```
+
+Open http://localhost:3000 after the `app` service becomes healthy.
+MongoDB data is stored in the `mongodb-data` named volume.
+
+Run the full test suite against the Compose databases with:
+
+``` console
+$ docker compose run --rm app npm test
+```
+
+To stop the services without deleting the database:
+
+``` console
+$ docker compose down
+```
+
+To also delete the local MongoDB data, explicitly remove the volume:
+
+``` console
+$ docker compose down --volumes
+```
+
+The supplied `docker/default.yml` is intended only for local verification.
+Use your own `.config/default.yml` and secrets for a real deployment.