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cloud-init is being upgraded in RHEL AH 7.2 to cover interaction with docker storage, auth, network and more.

We need to document:

* how to use cloud-init on AH
* it's interaction with docker storage, auth and networking (if applicable).

It should be documented in:

* Installation and Configuration Guide [2]

[2] https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux_Atomic_Host/7/html-single/Installation_and_Configuration_Guide/index.html

Hi Brent, can you tell me which version of cloud-init will be included in RHEL Atomic 7.2? Do you have a list of the new features?

Sorry Brent, thanks for providing the right name. Lars, can you point me to some initial information?

Beyond the subscription manager case, I am not aware offhand of any new features specific to either Docker or Atomic Host in cloud-init for 7.2.

If we're just looking for new documentation specific to cloud-init and AH (again not specific necessarily to 7.2), of the aspects mentioned (storage, auth, networking), I think storage is most important.

We could cross link to https://access.redhat.com/articles/1492923#dss_config
and note that those shell script commands can be run via `bootcmd` hooks.

Similarly, editing /etc/sysconfig/docker to e.g. add `--block-registry docker.io` or other options would also make sense from `bootcmd`.

I've added the following sections to 1.6. Setting up cloud-init:

 How do I set up storage with docker-storage-setup? 
 How do I enable the Overlay Graph Driver? 
 How do I manage Red Hat subscriptions with cloud-init?

Sections have been added to the Installation and Configuraiton guide, here:

https://access.qa.redhat.com/documentation/en/red-hat-enterprise-linux-atomic-host/version-7/installation-and-configuration-guide/#setting_up_cloud_init