arrange: system configration

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+.. _host-information:
+
+################
+Host Information
+################
+
+This section describes the system's host information and how to configure them,
+it covers the following topics:
+
+* Host name
+* Domain
+* IP address
+* Aliases
+
+Hostname
+========
+
+A hostname is the label (name) assigned to a network device (a host) on a
+network and is used to distinguish one device from another on specific networks
+or over the internet. On the other hand this will be the name which appears on
+the command line prompt.
+
+.. cfgcmd:: set system host-name <hostname>
+
+   Set system hostname. The hostname can be up to 63 characters. A hostname
+   must start and end with a letter or digit, and have as interior characters
+   only letters, digits, or a hyphen.
+
+   The default hostname used is `vyos`.
+
+Domain Name
+===========
+
+A domain name is the label (name) assigned to a computer network and is thus
+unique. VyOS appends the domain name as a suffix to any unqualified name. For
+example, if you set the domain name `example.com`, and you would ping the
+unqualified name of `crux`, then VyOS qualifies the name to `crux.example.com`.
+
+.. cfgcmd:: set system domain-name <domain>
+
+   Configure system domain name. A domain name must start and end with a letter
+   or digit, and have as interior characters only letters, digits, or a hyphen.
+
+Static Hostname Mapping
+=======================
+
+How an IP address is assigned to an interface in :ref:`ethernet-interface`.
+This section shows how to statically map an IP address to a hostname for local
+(meaning on this VyOS instance) name resolution.
+
+.. cfgcmd:: set system static-host-mapping host-name <hostname> inet <address>
+
+   Create a static hostname mapping which will always resolve the name
+   `<hostname>` to IP address `<address>`.
+
+
+.. cfgcmd:: set system static-host-mapping host-name <hostname> alias <alias>
+
+   Create named `<alias>` for the configured static mapping for `<hostname>`.
+   Thus the address configured as :cfgcmd:`set system static-host-mapping
+   host-name <hostname> inet <address>` can be reached via multiple names.
+
+   Multiple aliases can pe specified per host-name.