1. Proposed title of this feature request

Agent installer to preserve existing partition(s) at installation

2. What is the nature and description of the request?

When a server has multiple partitions, one to host a rescue/maintenance OS that is used to install the operating system (ie. CoreOS) to a second partition, the Agent installer should not delete existing partitions and take the whole disk.

Currently, the Agent installer will wipe out any existing partitions and use the entire disk for the CoreOS installation.

3. Why does the customer need this? (List the business requirements here)

This is needed so a rescue/maintenance partition can run an OS in its own partition and install the default OS (ie. CoreOS) into a second partition. Later, if the server becomes unstable, the server could be booted back into the rescue/maintenance partition so that the second partition could be reinstalled/reimaged.

4. List any affected packages or components.

The underlying {{coreos-install }}has the following arguments:

--save-partlabel

--save-partindex

which are not exposed currently in the Agent-based Installer