| Env Variables | Description | Default values |
|---|---|---|
| DB_URL | The database URL to use in URL format. SeeDatabases for more information. | sqlite3:///app/data/fn.db |
| MQ_URL | The message queue to use in URL format. SeeMessage Queues for more information. | bolt:///app/data/worker_mq.db |
| API_URL | The primary Fn API URL to that this instance will talk to. In a production environment, this would be your load balancer URL. | N/A |
| PORT | Sets the port to run on | 8080 |
| LOG_LEVEL | Set to DEBUG to enable debugging | INFO |
| DOCKER_HOST | Docker remote API URL | /var/run/docker.sock:/var/run/docker.sock |
| DOCKER_API_VERSION | Docker remote API version | 1.24 |
| DOCKER_TLS_VERIFY | Set this option to enable/disable Docker remote API over TLS/SSL. | 0 |
| DOCKER_CERT_PATH | Set this option to specify where CA cert placeholder | ~/.docker/cert.pem |
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原文：http://www.cnblogs.com/rongfengliang/p/7627527.html