From 07a59dd05daa4c4f63b15b62093dd441e7283b60 Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Fri, 20 Dec 2019 18:21:23 +0100
Subject: host-information: simplify documentation

---
 docs/system/host-information.rst | 137 ++++++++-------------------------------
 1 file changed, 26 insertions(+), 111 deletions(-)

diff --git a/docs/system/host-information.rst b/docs/system/host-information.rst
index 1f2f6918..89f1c6ad 100644
--- a/docs/system/host-information.rst
+++ b/docs/system/host-information.rst
@@ -10,7 +10,6 @@ it covers the following topics:
 * Host name
 * Domain
 * IP address
-* Default gateway
 * Aliases
 
 Hostname
@@ -18,131 +17,47 @@ 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.
+or over the internet. On the other hand this will be the name which appears on
+the command line prompt.
 
-Set a system host name:
+.. cfgcmd:: set system host-name '<hostname>'
 
-.. code-block:: none
+   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.
 
-  set system host-name <hostname>
-
-.. note:: Only letters, numbers and hyphens are allowed.
-
-Show host name:
-
-.. code-block:: none
-
-  show system host-name
-
-Delete host name:
-
-.. code-block:: none
-
-  delete system host-name <hostname>
-
-Example: Set system hostname to 'RT01':
-
-.. code-block:: none
-
-  set system host-name RT01
-  commit
-  show system host-name
-    host-name RT01
+   The default hostname used is `vyos`.
 
 Domain Name
 ===========
 
 A domain name is the label (name) assigned to a computer network and is thus
-unique.
-
-Set the system's domain:
-
-.. code-block:: none
-
-  set system domain-name <domain>
-
-.. note:: Only letters, numbers, hyphens and periods are allowed.
-
-Show domain:
-
-.. code-block:: none
-
-  show system domain-name
-
-Remove domain name:
-
-.. code-block:: none
-
-  set system delete domain-name <domain>
-
-Example: Set system domain to example.com:
-
-.. code-block:: none
-
-  set system domain-name example.com
-  commit
-  show system domain-name
-    domain-name example.com
-
-Static host mappings
-====================
-
-How to assign IPs to interfaces is described in chapter
-:ref:`interfaces-addresses`. This section shows how to statically map a system
-IP to its host name for local (meaning on this VyOS instance) DNS resolution:
-
-.. code-block:: none
-
-  set system static-host-mapping host-name <hostname> inet <IP address>
-
-Show static mapping:
-
-.. code-block:: none
-
-  show system static-host-mapping
-
-Example: Create a static mapping between the system's hostname `RT01` and
-IP address `10.20.30.41`:
-
-.. code-block:: none
-
-  set system static-host-mapping host-name RT01 inet 10.20.30.41
-  commit
-  show system static-host-mapping
-    host-name RT01 {
-        inet 10.20.30.41
-    }
-
-Aliases
--------
-
-One or more system aliases (static mappings) can be defined:
-
-.. code-block:: none
-
-  set system static-host-mapping host-name <hostname> alias <alias>
+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`.
 
-Show aliases:
+.. cfgcmd:: set system domain-name '<domain>'
 
-.. code-block:: none
+   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.
 
-  show system static-mapping
+Static Hostname Mapping
+=======================
 
-Delete alias:
+How an IP address is assigned to an interface in :ref:`interfaces-addresses`.
+This section shows how to statically map an IP address to a hostname for local
+(meaning on this VyOS instance) name resolution.
 
-.. code-block:: none
+.. cfgcmd:: set system static-host-mapping host-name '<hostname>' inet '<address>'
 
-  delete system static-host-mapping host-name <hostname> alias <alias>
+   Create a static hostname mapping which will always resolve the name
+   `<hostname>` to IP address `<address>`.
 
-Example: Set alias `router1` for system with hostname `RT01`:
 
-.. code-block:: none
+.. cfgcmd:: set system static-host-mapping host-name '<hostname>' alias '<alias>'
 
-  set system static-host-mapping host-name RT01 alias router1
-  commit
-  show system static-host-mapping
-    host-name RT01 {
-        alias router1
-        inet 10.20.30.41
-    }
+   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.
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