Preparing to build an image

Before you can begin building a custom image, you must prepare by gathering the registry URL and downloading the image configuration file and the image.

To prepare to build an image:

1. Get the registry URL to use for Docker commands and in scripts. You need a private registry URL configured for WML custom images in Cloud Pak for Data. For details, see Setting up installation environment variables.
2. Download the configuration file for the runtime image that you want to customize. Refer to Downloading the runtime configuration.
3. Download the image in the configuration. Refer to Downloading the runtime image.