Base device size set to default value (10 GB)
Set up the docker integration.
Description
Under certain circumstances, you might need containers larger than 10G. Where this applies you should carefully choose the base device size.
Rationale
The base device size can be increased on daemon restart. Increasing the base device size allows all future images and containers to be of the new base device size. A user can use this option to expand the base device size, however shrinking is not permitted. This value affects the system wide base empty filesystem that may already be initialized and therefore inherited by pulled images. Although the file system does not allocate the increased size as long as it is empty, more space will be allocated for extra images. This may cause a denial of service condition if the allocated partition becomes full.
Audit
Confirm the base device size setting the dockerd startup options and settings in the /etc/docker/daemon.json file. To review the dockerd startup options, run:
There should be no --storage-opt dm.basesize parameters. Also review the /etc/docker/daemon.json file for the presence of basesize settings.
Do not set --storage-opt dm.basesize until needed.
Impact
None.
Default value
The default base device size is 10G.
References
- https://docs.docker.com/engine/reference/commandline/dockerd/#storage-driver-options
CIS controls
Version 6
18 Application Software Security Application Software Security
