With ComponentPack 18.104.22.168 IBM changed the Docker driver from overlay to devicemapper. Which is a good thing because there were some issues before (more information). But please be aware that you shouldn’t use the default settings in a production environment!
Why? The default installation uses loop-lvm with the devicemapper storage driver. Loop-lvm is much easier to configure and does not need any special requirements. But it’s also not supported in production environments! Because it’s slow and resource-intensive (more information on loop-lvm).
I recommend using the –docker_storage_block_device flag which is part of the deployCfC.sh script. The flag can be used to define a physical device which then will be used and configured for devicemapper.
If you would like to be more flexible you can still use the –skip_docker_deployment flag to install and configure Docker on your own before starting the installation. Be sure to use the supported Docker version. I blogged about those steps earlier.