> ## Documentation Index > Fetch the complete documentation index at: https://rasa.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Studio Environment Variables > Server ## Server The Studio server handles the API, user authentication, assistant configuration, and conversation storage. ### Core | Environment Variable | Description | Default | | ---------------------- | ------------------------------------------------------------------------------------------------------------------------------ | ------- | | `RASA_PRO_LICENSE` | The Rasa Pro license key. | | | `OPENAI_API_KEY` | The OpenAI API key for LLM-powered features. | | | `HTTP_REQUEST_TIMEOUT` | The HTTP request timeout in milliseconds. Set this higher than your load balancer timeout to avoid premature connection drops. | `61000` | ### Database The database stores conversations, assistant configurations, and analytics data. Both the Studio server and the event ingestion service use this same database connection. | Environment Variable | Description | Default | | ------------------------ | ------------------------------------------------------------------------------------------ | -------- | | `DB_HOST` | The hostname of the PostgreSQL database. | | | `DB_PORT` | The port of the PostgreSQL database. | `5432` | | `DB_NAME` | The name of the PostgreSQL database. | `studio` | | `DB_USER` | The username for the PostgreSQL database. | | | `DB_PASS` | The password for the PostgreSQL database. | | | `DB_QUERY` | Additional connection query parameters. | | | `DB_TRANSACTION_TIMEOUT` | The database transaction timeout in milliseconds. | `10000` | | `USE_AWS_IAM_AUTH` | Set to `true` to use AWS IAM authentication for the database instead of username/password. | `false` | | `AWS_REGION` | The AWS region for IAM authentication. Required if `USE_AWS_IAM_AUTH` is `true`. | | | `IAM_DB_USER` | The IAM database username. Required if `USE_AWS_IAM_AUTH` is `true`. | | ### Authentication Studio uses [Keycloak](https://www.keycloak.org/) for identity and access management. | Environment Variable | Description | Default | | ------------------------- | ----------------------------------------------------- | --------------------- | | `KEYCLOAK_REALM` | The Keycloak realm name. | `rasa-studio` | | `KEYCLOAK_CLIENT_ID` | The Keycloak client ID for the Studio backend. | `rasa-studio-backend` | | `KEYCLOAK_ADMIN_USERNAME` | The Keycloak admin username. | `kcadmin` | | `KEYCLOAK_ADMIN_PASSWORD` | The Keycloak admin password. | | | `KEYCLOAK_API_USERNAME` | The username for Keycloak realm management API calls. | `realmadmin` | | `KEYCLOAK_API_PASSWORD` | The password for Keycloak realm management API calls. | | | `KEYCLOAK_API_CLIENT_ID` | The client ID for Keycloak API authentication. | `admin-cli` | ### Model Server | Environment Variable | Description | Default | | -------------------- | ------------------------------------- | ---------------- | | `MS_API_URL` | The URL of the Rasa model server API. | `http://rasapro` | ### Conversation Management | Environment Variable | Description | Default | | ------------------------------------------ | ------------------------------------------------------------------------------------------------------- | ----------- | | `DELETE_CONVERSATIONS_OLDER_THAN_HOURS` | Delete conversations older than this many hours. When not set, conversations are retained indefinitely. | | | `DELETE_CONVERSATIONS_CRON_EXPRESSION` | Cron expression controlling when the conversation deletion job runs. | `0 * * * *` | | `VERSION_DAILY_STATISTICS_CRON_EXPRESSION` | Cron expression controlling when daily version statistics are computed. | `0 0 * * *` | ### Voice | Environment Variable | Description | Default | | ------------------------------- | -------------------------------------------------------------- | ---------- | | `BROWSER_AUDIO_MONITOR_SILENCE` | Set to `false` to disable silence detection in audio sessions. | `true` | | `BROWSER_AUDIO_ASR` | The speech-to-text (ASR) provider name. | `deepgram` | | `BROWSER_AUDIO_TTS` | The text-to-speech (TTS) provider name. | `cartesia` | | `DEEPGRAM_API_KEY` | The Deepgram API key for speech-to-text. | | | `CARTESIA_API_KEY` | The Cartesia API key for text-to-speech. | | **To enable voice features**, you must set both `DEEPGRAM_API_KEY` and `CARTESIA_API_KEY`, even if you are only using one of the providers for both speech-to-text and text-to-speech. In such a case, set the unused provider's environment variable to a placeholder value (e.g., `CARTESIA_API_KEY=unused`). ### Observability | Environment Variable | Description | Default | | -------------------- | ---------------------------------------------------------------------------- | ------- | | `LOG_LEVEL_DEBUG` | Set to `true` to enable debug-level logging. | `false` | | `LOG_FILE` | Path to a file where logs are written. When not set, logs go to stdout only. | | ### Advanced | Environment Variable | Description | Default | | ------------------------------ | ------------------------------------------------------------------------------------------------------- | --------- | | `TRAINING_POLLING_INTERVAL_MS` | Interval in milliseconds at which Studio polls for model training status. Minimum value: `1000`. | `1000` | | `MODEL_POLLING_INTERVAL_MS` | Interval in milliseconds at which Studio polls for model deployment status. Minimum value: `2000`. | `2000` | | `MODEL_INACTIVE_AFTER_MS` | Time in milliseconds after which a running model version is marked as inactive. Minimum value: `60000`. | `3600000` | ## Event Ingestion Studio consumes Rasa events from a Kafka topic to power analytics and conversation review. Ingested events are persisted to the same PostgreSQL database configured in the [Database](/docs/reference/config/studio-environment-variables#database) section above. ### Kafka | Environment Variable | Description | Default | | --------------------------- | ----------------------------------------------------------------------------------- | ------------------- | | `KAFKA_BROKER_ADDRESS` | The address of the Kafka broker. | | | `KAFKA_TOPIC` | The Kafka topic that Rasa publishes events to. | `rasa-events` | | `KAFKA_DLQ_TOPIC` | The Kafka dead letter queue topic for events that fail processing. | `rasa-events-dlq` | | `KAFKA_CLIENT_ID` | The Kafka client identifier. | `kafka-python-rasa` | | `KAFKA_GROUP_ID` | The Kafka consumer group ID. | `studio` | | `KAFKA_SASL_MECHANISM` | The SASL mechanism for Kafka authentication (e.g. `PLAIN`, `SCRAM-SHA-256`). | | | `KAFKA_SASL_USERNAME` | The username for Kafka SASL authentication. | | | `KAFKA_SASL_PASSWORD` | The password for Kafka SASL authentication. | | | `KAFKA_ENABLE_SSL` | Set to `true` to enable SSL/TLS for Kafka connections. | `false` | | `KAFKA_REJECT_UNAUTHORIZED` | Set to `false` to allow untrusted SSL certificates. Not recommended for production. | `true` | | `KAFKA_CUSTOM_SSL` | Set to `true` to supply custom SSL certificate files via the variables below. | `false` | | `KAFKA_CA_FILE` | Path to the CA certificate file. Required when `KAFKA_CUSTOM_SSL` is `true`. | | | `KAFKA_CERT_FILE` | Path to the client certificate file. | | | `KAFKA_KEY_FILE` | Path to the client key file. | | | `KAFKA_MAX_RETRIES` | The maximum number of reconnection attempts before giving up. | `3` | ## Related topics - [Environment Variables](/docs/reference/config/environment-variables.md) - [Studio Architecture](/docs/reference/architecture/studio.md) - [Deploying to Kubernetes](/docs/pro/deploy/deploy-kubernetes.md) - [LLM Configuration for Rasa Pro ≥ 3.11](/docs/reference/config/components/llm-configuration.md) - [Secrets Managers](/docs/reference/integrations/secrets-managers.md)