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The source image to create this disk. When creating a new instance, one of
initializeParams.sourceImage or disks.source is required except for local SSD.
To create a disk with one of the public operating system images, specify the image by its
family name. For example, specify family/debian-9 to use the latest Debian 9 image: projects
/debian-cloud/global/images/family/debian-9
Alternatively, use a specific version of a public operating system image: projects/debian-
cloud/global/images/debian-9-stretch-vYYYYMMDD
To create a disk with a custom image that you created, specify the image name in the following
format: global/images/my-custom-image
You can also specify a custom image by its image family, which returns the latest version of
the image in that family. Replace the image name with family/family-name: global/images/family
/my-image-family
If the source image is deleted later, this field will not be set.