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Set Hostname
------------
**Summary:** set hostname and fqdn

This module handles setting the system hostname and fqdn. If
``preserve_hostname`` is set, then the hostname will not be altered.

A hostname and fqdn can be provided by specifying a full domain name under the
``fqdn`` key. Alternatively, a hostname can be specified using the ``hostname``
key, and the fqdn of the cloud wil be used. If a fqdn specified with the
``hostname`` key, it will be handled properly, although it is better to use
the ``fqdn`` config key. If both ``fqdn`` and ``hostname`` are set,
it is distro dependent whether ``hostname`` or ``fqdn`` is used,
unless the ``prefer_fqdn_over_hostname`` option is true and fqdn is set
it will force the use of FQDN in all distros, and if false then it will
force the hostname use.

This module will run in the init-local stage before networking is configured
if the hostname is set by metadata or user data on the local system.

This will occur on datasources like nocloud and ovf where metadata and user
data are available locally. This ensures that the desired hostname is applied
before any DHCP requests are preformed on these platforms where dynamic DNS is
based on initial hostname.

**Internal name:** ``cc_set_hostname``

**Module frequency:** always

**Supported distros:** all

**Config keys**::

    preserve_hostname: <true/false>
    prefer_fqdn_over_hostname: <true/false>
    fqdn: <fqdn>
    hostname: <fqdn/hostname>
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