www.nico.schottelius.org/software/cdist/man/2.0.10/man7/cdist-manifest.html
Nico Schottelius e20ff30954 cdist update
2012-05-18 16:45:48 +02:00

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>cdist-manifest(7)</title><link rel="stylesheet" type="text/css" href="docbook-xsl.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /></head><body><div xml:lang="en" class="article" title="cdist-manifest(7)" lang="en"><div class="titlepage"><div><div><h2 class="title"><a id="idp25204064"></a>cdist-manifest(7)</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Nico</span> <span class="surname">Schottelius</span></h3><code class="email">&lt;<a class="email" href="mailto:nico-cdist--@--schottelius.org">nico-cdist--@--schottelius.org</a>&gt;</code></div></div></div><hr /></div><div class="toc"><p><strong>Table of Contents</strong></p><dl><dt><span class="section"><a href="#_name">1. NAME</a></span></dt><dt><span class="section"><a href="#_description">2. DESCRIPTION</a></span></dt><dt><span class="section"><a href="#_initial_and_type_manifests">3. INITIAL AND TYPE MANIFESTS</a></span></dt><dt><span class="section"><a href="#_define_state_in_the_initial_manifest">4. DEFINE STATE IN THE INITIAL MANIFEST</a></span></dt><dt><span class="section"><a href="#_splitting_up_the_initial_manifest">5. SPLITTING UP THE INITIAL MANIFEST</a></span></dt><dt><span class="section"><a href="#_dependencies">6. DEPENDENCIES</a></span></dt><dt><span class="section"><a href="#_examples">7. EXAMPLES</a></span></dt><dt><span class="section"><a href="#_see_also">8. SEE ALSO</a></span></dt><dt><span class="section"><a href="#_copying">9. COPYING</a></span></dt></dl></div><div class="section" title="1. NAME"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_name"></a>1. NAME</h2></div></div></div><p>cdist-manifest - (Re-)Use types</p></div><div class="section" title="2. DESCRIPTION"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_description"></a>2. DESCRIPTION</h2></div></div></div><p>Manifests are used to define which objects to create.
Objects are instances of <span class="strong"><strong>types</strong></span>, like in object orientated programming languages.
An object is represented by the combination of
<span class="strong"><strong>type + slash + object name</strong></span>: <span class="strong"><strong><span class="emphasis"><em>file/etc/cdist-configured</em></span> is an
object of the type <span class="strong"><strong><span class="strong"><strong></strong></span>file</strong></span></strong></span> with the name <span class="strong"><strong><span class="strong"><strong>etc/cdist-configured</strong></span></strong></span>.</p><p>All available types can be found in the <span class="strong"><strong>conf/type/</strong></span> directory,
use <span class="strong"><strong>ls conf/type</strong></span> to get the list of available types. If you have
setup the MANPATH correctly, you can use <span class="strong"><strong>man cdist-reference</strong></span> to access
the reference with pointers to the manpages.</p><p>Types in manifests are used like normal command line tools. Lets have a look
at an example:</p><pre class="screen"># Create object of type __package with the parameter state = removed
__package apache2 --state removed
# Same with the __directory type
__directory /tmp/cdist --state present</pre><p>These two lines create objects, which will later be used to realise the
configuration on the target host.</p><p>Manifests are executed locally as a shell script using <span class="strong"><strong>/bin/sh -e</strong></span>.
The resulting objects are stored in an internal database.</p><p>The same object can be redefined in multiple different manifests as long as
the parameters are exactly the same.</p><p>In general, manifests are used to define which types are used depending
on given conditions.</p></div><div class="section" title="3. INITIAL AND TYPE MANIFESTS"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_initial_and_type_manifests"></a>3. INITIAL AND TYPE MANIFESTS</h2></div></div></div><p>Cdist knows about two types of manifests: The initial manifest and type
manifests. The initial manifest is used to define, which configurations
to apply to which hosts. The type manifests are used to create objects
from types. More about manifests in types can be found in cdist-type(7).</p></div><div class="section" title="4. DEFINE STATE IN THE INITIAL MANIFEST"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_define_state_in_the_initial_manifest"></a>4. DEFINE STATE IN THE INITIAL MANIFEST</h2></div></div></div><p>The <span class="strong"><strong>initial manifest</strong></span> is the entry point for cdist to find out, which
<span class="strong"><strong>objects</strong></span> to configure on the selected host.
Cdist searches for the initial manifest at <span class="strong"><strong>conf/manifest/init</strong></span>.</p><p>Within this initial manifest, you define, which objects should be
created on which host. To distinguish between hosts, you can use the
environment variable <span class="strong"><strong>__target_host</strong></span>. Lets have a look at a simple
example:</p><pre class="screen">__cdistmarker
case "$__target_host" in
localhost)
__directory /home/services/kvm-vm --parents yes
;;
esac</pre><p>This manifest says: Independent of the host, always use the type
<span class="strong"><strong><span class="strong"><strong>__cdistmarker</strong></span></strong></span>, which creates the file <span class="strong"><strong>/etc/cdist-configured</strong></span>,
with the timestamp as content.
The directory <span class="strong"><strong><span class="strong"><strong>/home/services/kvm-vm</strong></span></strong></span>, including all parent directories,
is only created on the host <span class="strong"><strong><span class="strong"><strong>localhost</strong></span></strong></span>.</p><p>As you can see, there is no magic involved, the manifest is simple shell code that
utilises cdist types. Every available type can be executed like a normal
command.</p></div><div class="section" title="5. SPLITTING UP THE INITIAL MANIFEST"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_splitting_up_the_initial_manifest"></a>5. SPLITTING UP THE INITIAL MANIFEST</h2></div></div></div><p>If you want to split up your initial manifest, you can create other shell
scripts in <span class="strong"><strong>conf/manifest/</strong></span> and include them in <span class="strong"><strong>conf/manifest/init</strong></span>.
Cdist provides the environment variable <span class="strong"><strong><span class="strong"><strong>__manifest</strong></span></strong></span> to reference to
the directory containing the initial manifest (see cdist-reference(7)).</p><p>The following example would include every file with a <span class="strong"><strong>.sh</strong></span> suffix:</p><pre class="screen"># Include *.sh
for manifest in $__manifest/*.sh; do
# And source scripts into our shell environment
. "$manifest"
done</pre></div><div class="section" title="6. DEPENDENCIES"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_dependencies"></a>6. DEPENDENCIES</h2></div></div></div><p>If you want to describe that something requires something else, just
setup the variable "require" to contain the requirements. Multiple
requirements can be added white space seperated.</p><pre class="screen"># No dependency
__file /etc/cdist-configured
# Require above object
require="__file/etc/cdist-configured" __link /tmp/cdist-testfile \
--source /etc/cdist-configured --type symbolic
# Require two objects
require="__file/etc/cdist-configured __link/tmp/cdist-testfile" \
__file /tmp/cdist-another-testfile</pre><p>All objects that are created in a type manifest are automatically required
from the type that is calling them. This is called "autorequirement" in
cdist jargon.</p></div><div class="section" title="7. EXAMPLES"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_examples"></a>7. EXAMPLES</h2></div></div></div><p>The initial manifest may for instance contain the following code:</p><pre class="screen"># Always create this file, so other sysadmins know cdist is used.
__file /etc/cdist-configured --type file
case "$__target_host" in
my.server.name)
__file /root/bin/ --type directory
__file /etc/issue.net --type file --source "$__manifest/issue.net
;;
esac</pre><p>The manifest of the type "nologin" may look like this:</p><pre class="screen">__file /etc/nologin --type file --source "$__type/files/default.nologin"</pre></div><div class="section" title="8. SEE ALSO"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_see_also"></a>8. SEE ALSO</h2></div></div></div><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
cdist-tutorial(7)
</li><li class="listitem">
cdist-type(7)
</li></ul></div></div><div class="section" title="9. COPYING"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_copying"></a>9. COPYING</h2></div></div></div><p>Copyright (C) 2010-2012 Nico Schottelius. Free use of this software is
granted under the terms of the GNU General Public License version 3 (GPLv3).</p></div></div></body></html>