# Source: https://github.com/jina-ai/jina/blob/master/docs/envs/index.md(jina-env-vars)=# {octicon}`list-unordered` Environment VariablesJina-serve uses environment variables to determine different behaviours. To see all supported environment variables and their current values, run:```bashjina -vf```If you use containerized Executors (including {ref}`Kubernetes <kubernetes>` and {ref}`Docker Compose <docker-compose>`), you can pass separate environment variables to each Executor in the following way:`````{tab} FLow YAML```yamljtype: Flowwith: {}executors:- name: executor0  port: 49583  env:    JINA_LOG_LEVEL: DEBUG    MYSECRET: ${{ ENV.MYSECRET }}- name: executor1  port: 62156  env:    JINA_LOG_LEVEL: INFO    CUDA_VISIBLE_DEVICES: 1`````````````{tab} Deployment YAML```yamljtype: Deploymentwith:  name: executor0  port: 49583  env:    JINA_LOG_LEVEL: DEBUG    MYSECRET: ${{ ENV.MYSECRET }}````````````{tab} Python API```pythonfrom jina import Flowimport ossecret = os.environ['MYSECRET']f = (    Flow()    .add(env={'JINA_LOG_LEVEL': 'DEBUG', 'MYSECRET': secret})    .add(env={'JINA_LOG_LEVEL': 'INFO', 'CUDA_VISIBLE_DEVICES': 1}))f.save_config("envflow.yml")```````The following environment variables are used internally in Jina:| Environment variable          | Description                                                                                                                                                                                     ||-------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|| `JINA_AUTH_TOKEN`             | Authentication token of Jina Cloud                                                                                                                                                              || `JINA_DEFAULT_HOST`           | Default host where server is exposed                                                                                                                                                    || `JINA_DEFAULT_TIMEOUT_CTRL`   | Default timeout time used by Flow to check readiness of Executors                                                                                                                       || `JINA_DEPLOYMENT_NAME`        | Name of deployment, used by Head Runtime in Kubernetes to connect to different deployments                                                                                          || `JINA_DISABLE_UVLOOP`         | If set, Jina will not use uvloop event loop for concurrent execution                                                                                                                            || `JINA_FULL_CLI`               | If set, all CLI options will be shown in help                                                                                                                                                                                                                                                            || `JINA_GATEWAY_IMAGE`          | Used when exporting a Flow to Kubernetes or Docker Compose to override default gateway image                                                                                                                                                                                                             || `JINA_GRPC_RECV_BYTES`        | Set by gRPC service to keep track of received bytes                                                                                                                                     || `JINA_GRPC_SEND_BYTES`        | Set by gRPC service to keep track of sent bytes                                                                                                                                         || `JINA_K8S_ACCESS_MODES`       | Configures access modes for `PersistentVolumeClaim` attached to `StatefulSet`, when creating a `StatefulSet` in Kubernetes for an Executor using volumes. Defaults to '["ReadWriteOnce"]' || `JINA_K8S_STORAGE_CAPACITY`   | Configures capacity for `PersistentVolumeClaim` attached to `StatefulSet`, when creating a `StatefulSet` in Kubernetes for an Executor using volumes. Defaults to '10G'                   || `JINA_K8S_STORAGE_CLASS_NAME` | Configures storage class for `PersistentVolumeClaim` attached to `StatefulSet`, when creating a `StatefulSet` in Kubernetes for an Executor using volumes. Defaults to 'standard'         || `JINA_LOCKS_ROOT`             | Root folder where file locks for concurrent Executor initialization                                                                                                                         || `JINA_LOG_CONFIG`             | Configuration used for logger                                                                                                                                                           || `JINA_LOG_LEVEL`              | Logging level used: INFO, DEBUG, WARNING                                                                                                                                                    || `JINA_LOG_NO_COLOR`           | If set, disables color from rich console                                                                                                                                                        || `JINA_MP_START_METHOD`        | Sets multiprocessing start method used by Jina                                                                                                                                              || `JINA_OPTOUT_TELEMETRY`       | If set, disables telemetry                                                                                                                                                                                                                                                                                            || `JINA_RANDOM_PORT_MAX`        | Maximum port number used when selecting random ports to apply for Executors or Gateway                                                                                                                                                                                                                                                                                                                                                                                   || `JINA_RANDOM_PORT_MIN`        | Minimum port number used when selecting random ports to apply for Executors or Gateway                                                                                                                                                                                                                                                                                                                                                                                   || `JINA_STREAMER_ARGS`          | Jina uses this variable to inject `GatewayStreamer` arguments into host environment running a Gateway                                                                                         |