晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/share/doc/cloud-init/userdata.txt
=== Overview ===
Userdata is data provided by the entity that launches an instance.
The cloud provider makes this data available to the instance via in one
way or another.  

In EC2, the data is provided by the user via the '--user-data' or
'user-data-file' argument to ec2-run-instances.  The EC2 cloud makes the
data available to the instance via its meta-data service at 
http://169.254.169.254/latest/user-data

cloud-init can read this input and act on it in different ways.

=== Input Formats ===
cloud-init will download and cache to filesystem any user-data that it
finds.  However, certain types of user-data are handled specially.

 * Gzip Compressed Content
   content found to be gzip compressed will be uncompressed, and 
   these rules applied to the uncompressed data

 * Mime Multi Part archive
   This list of rules is applied to each part of this multi-part file
   Using a mime-multi part file, the user can specify more than one
   type of data.  For example, both a user data script and a
   cloud-config type could be specified.

 * User-Data Script
   begins with: #!            or Content-Type: text/x-shellscript
   script will be executed at "rc.local-like" level during first boot.
   rc.local-like means "very late in the boot sequence"

 * Include File
   begins with  #include      or Content-Type: text/x-include-url
   This content is a "include" file.  The file contains a list of
   urls, one per line.  Each of the URLs will be read, and their content
   will be passed through this same set of rules.  Ie, the content
   read from the URL can be gzipped, mime-multi-part, or plain text

* Include File Once
   begins with  #include-once      or Content-Type: text/x-include-once-url
   This content is a "include" file.  The file contains a list of
   urls, one per line.  Each of the URLs will be read, and their content
   will be passed through this same set of rules.  Ie, the content
   read from the URL can be gzipped, mime-multi-part, or plain text
   This file will just be downloaded only once per instance, and its
   contents cached for subsequent boots.  This allows you to pass in
   one-time-use or expiring URLs.

 * Cloud Config Data
   begins with  #cloud-config or Content-Type: text/cloud-config

   This content is "cloud-config" data.  See the examples for a
   commented example of supported config formats.

 * Cloud Boothook 
   begins with #cloud-boothook or Content-Type: text/cloud-boothook

   This content is "boothook" data.  It is stored in a file under
   /var/lib/cloud and then executed immediately.

   This is the earliest "hook" available.  Note, that there is no
   mechanism provided for running only once.  The boothook must take
   care of this itself.  It is provided with the instance id in the
   environment variable "INSTANCE_ID".  This could be made use of to
   provide a 'once-per-instance'

=== Examples ===
There are examples in the examples subdirectory.
Additionally, the 'tools' directory contains 'write-mime-multipart',
which can be used to easily generate mime-multi-part files from a list
of input files.  That data can then be given to an instance.

See 'write-mime-multipart --help' for usage.

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