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Ways to debug deploy image?

I'm able to boot a bare metal instance to its deploy image (the recommended coreos one). There is a small window where I can ssh to the instance. It's failing to attach iscsi volume:

ironic.drivers.modules.agent_base_vendor Command: sudo ironic-rootwrap /etc/ironic/rootwrap.conf dd if=/dev/zero of=/dev/disk/by-path/ip-10.42.42.12:3260-iscsi-iqn.2008-10.org.openstack:f677f1de-91f4-4451-8663-d1f53ebf31bd-lun-1 bs=512 count=36

It shuts down shortly after. Short of building a custom deploy image, is there something I can do to keep the machine from shutting down so I can trouble-shoot? Thanks!