# Docker container built for no internet access

If you are deploying a Spotfire Service for Python to use in a system with no internet access, you must configure the container image so that it does not try to build an image on top of the one that you have initially built in a system with internet access.

Configuration property | Default setting | Description
--- | --- | ---
`use.immutable.container` | `false` | Set to `true` to indicate to the service that the image identifier (`name:tag`) that is given in the `docker.image.name` is immutable, and should be used directly without building an image on top of it. The default is `false`. This property is required only for containers that are used in Spotfire Server deployments that do not have access to the internet. Note: To use an immutable container, you must have installed the supported version of the Java Development Kit (for the Spotfire Server) in the container.

For more information, see Configuring a custom Docker image on a node with no internet access.