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<!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-stages(7)</title><link rel="stylesheet" type="text/css" href="docbook-xsl.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div xml:lang="en" class="article" lang="en"><div class="titlepage"><div><div><h2 class="title"><a id="idm140554107627664"></a>cdist-stages(7)</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Nico</span> <span class="surname">Schottelius</span></h3><code class="email"><<a class="email" href="mailto:nico-cdist--@--schottelius.org">nico-cdist--@--schottelius.org</a>></code></div></div></div><hr /></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><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="#_stage_1_target_information_retrieval">3. STAGE 1: TARGET INFORMATION RETRIEVAL</a></span></dt><dt><span class="section"><a href="#_stage_2_run_the_initial_manifest">4. STAGE 2: RUN THE INITIAL MANIFEST</a></span></dt><dt><span class="section"><a href="#_stage_3_object_information_retrieval">5. STAGE 3: OBJECT INFORMATION RETRIEVAL</a></span></dt><dt><span class="section"><a href="#_stage_4_run_the_object_manifest">6. STAGE 4: RUN THE OBJECT MANIFEST</a></span></dt><dt><span class="section"><a href="#_stage_5_code_generation">7. STAGE 5: CODE GENERATION</a></span></dt><dt><span class="section"><a href="#_stage_6_code_execution">8. STAGE 6: CODE EXECUTION</a></span></dt><dt><span class="section"><a href="#_stage_7_cache">9. STAGE 7: CACHE</a></span></dt><dt><span class="section"><a href="#_summary">10. SUMMARY</a></span></dt><dt><span class="section"><a href="#_see_also">11. SEE ALSO</a></span></dt><dt><span class="section"><a href="#_copying">12. COPYING</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_name"></a>1. NAME</h2></div></div></div><p>cdist-stages - Stages used during configuration deployment</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_description"></a>2. DESCRIPTION</h2></div></div></div><p>Starting the execution of deployment with cdist, cdist passes
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through different stages.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_stage_1_target_information_retrieval"></a>3. STAGE 1: TARGET INFORMATION RETRIEVAL</h2></div></div></div><p>In this stage information is collected about the target host using so called
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explorers. Every existing explorer is run on the target and the output of all
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explorers are copied back into the local cache. The results can be used by
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manifests and types.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_stage_2_run_the_initial_manifest"></a>4. STAGE 2: RUN THE INITIAL MANIFEST</h2></div></div></div><p>The initial manifest, which should be used for mappings of hosts to types,
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is executed. This stage creates objects in a cconfig database that contains
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the objects as defined in the manifest for the specific host. In this stage,
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no conflicts may occur, i.e. no object of the same type with the same id may
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be created, if it has different parameters.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_stage_3_object_information_retrieval"></a>5. STAGE 3: OBJECT INFORMATION RETRIEVAL</h2></div></div></div><p>Every object is checked whether its type has explorers and if so, these are
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executed on the target host. The results are transferred back
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and can be used in the following stages to decide what changes need to be made
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on the target to implement the desired state.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_stage_4_run_the_object_manifest"></a>6. STAGE 4: RUN THE OBJECT MANIFEST</h2></div></div></div><p>Every object is checked whether its type has a executable manifest. The
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manifest script may generate and change the created objects. In other words,
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one type can reuse other types.</p><p>For instance the object <span class="emphasis"><em>apache/www.example.org is of type </em></span>apache, which may
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contain a manifest script, which creates new objects of type __file.</p><p>The newly created objects are merged back into the existing tree. No conflicts
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may occur during the merge. A conflict would mean that two different objects
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try to create the same object, which indicates a broken configuration.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_stage_5_code_generation"></a>7. STAGE 5: CODE GENERATION</h2></div></div></div><p>In this stage for every created object its type is checked for executable
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gencode scripts. The gencode scripts generate the code to be executed on the
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target on stdout. If the gencode executables fail, they must print diagnostic
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messages on stderr and exit non-zero.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_stage_6_code_execution"></a>8. STAGE 6: CODE EXECUTION</h2></div></div></div><p>For every object the resulting code from the previous stage is transferred to
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the target host and executed there to apply the configuration changes.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_stage_7_cache"></a>9. STAGE 7: CACHE</h2></div></div></div><p>The cache stores the information from the current run for later use.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_summary"></a>10. SUMMARY</h2></div></div></div><p>If, and only if, all the stages complete without an errors, the configuration
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will be applied to the target.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_see_also"></a>11. SEE ALSO</h2></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
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cdist(1)
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</li><li class="listitem">
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cdist-reference(7)
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</li></ul></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_copying"></a>12. COPYING</h2></div></div></div><p>Copyright (C) 2010-2012 Nico Schottelius, Steven Armstrong. Free use of this software is
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granted under the terms of the GNU General Public License version 3 (GPLv3).</p></div></div></body></html> |