I rely on cloud-init to set my hostnames.
I have a number of internal systems which rely on a machine knowing its own
hostname. In particular, at least one of my configuration management
systems requires that a host pass its fqdn to an API to fetch its CM data,
so grabbing hostnames and
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[Re-posting (in edited from) from openstack-dev]
Nova has a feature whereby it will provide instance host names that cloud-init
can extract and use inside the guest, i.e. this won't happen without cloud-
init. These host names are fully qualified domain names (FQDNs) based upon the
instance name
