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<li class="toctree-l1"><a class="reference internal" href="cdist-configuration.html">13. Configuration</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-manifest.html">14. Manifest</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-parallelization.html">19. Parallelization</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-inventory.html">20. Inventory</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-best-practice.html">23. Best practice</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">24. Execution stages</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#description">24.1. Description</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#stage-1-target-information-retrieval">24.2. Stage 1: target information retrieval</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#stage-2-run-the-initial-manifest">24.3. Stage 2: run the initial manifest</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#stage-3-object-information-retrieval">24.4. Stage 3: object information retrieval</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#stage-4-run-the-object-manifest">24.5. Stage 4: run the object manifest</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#stage-5-code-generation">24.6. Stage 5: code generation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#stage-6-code-execution">24.7. Stage 6: code execution</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#stage-7-cache">24.8. Stage 7: cache</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#summary">24.9. Summary</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-remote-exec-copy.html">27. Remote exec and copy commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-hacker.html">28. Hacking</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-troubleshooting.html">29. Troubleshooting</a></li>
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<div class="section" id="execution-stages">
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<h1>24. Execution stages<a class="headerlink" href="#execution-stages" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="description">
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<h2>24.1. Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>When cdist is started, it passes through different stages.</p>
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</div>
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<div class="section" id="stage-1-target-information-retrieval">
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<h2>24.2. Stage 1: target information retrieval<a class="headerlink" href="#stage-1-target-information-retrieval" title="Permalink to this headline">¶</a></h2>
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<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>
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</div>
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<div class="section" id="stage-2-run-the-initial-manifest">
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<h2>24.3. Stage 2: run the initial manifest<a class="headerlink" href="#stage-2-run-the-initial-manifest" title="Permalink to this headline">¶</a></h2>
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<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>
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</div>
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<div class="section" id="stage-3-object-information-retrieval">
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<h2>24.4. Stage 3: object information retrieval<a class="headerlink" href="#stage-3-object-information-retrieval" title="Permalink to this headline">¶</a></h2>
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<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>
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</div>
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<div class="section" id="stage-4-run-the-object-manifest">
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<h2>24.5. Stage 4: run the object manifest<a class="headerlink" href="#stage-4-run-the-object-manifest" title="Permalink to this headline">¶</a></h2>
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<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>
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<p>For instance the object __apache/www.example.org is of type __apache, which may
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contain a manifest script, which creates new objects of type __file.</p>
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<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>
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</div>
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<div class="section" id="stage-5-code-generation">
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<h2>24.6. Stage 5: code generation<a class="headerlink" href="#stage-5-code-generation" title="Permalink to this headline">¶</a></h2>
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<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>
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</div>
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<div class="section" id="stage-6-code-execution">
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<h2>24.7. Stage 6: code execution<a class="headerlink" href="#stage-6-code-execution" title="Permalink to this headline">¶</a></h2>
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<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>
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</div>
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<div class="section" id="stage-7-cache">
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<h2>24.8. Stage 7: cache<a class="headerlink" href="#stage-7-cache" title="Permalink to this headline">¶</a></h2>
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<p>The cache stores the information from the current run for later use.</p>
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</div>
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<div class="section" id="summary">
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<h2>24.9. Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
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<p>If, and only if, all the stages complete without errors, the configuration
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will be applied to the target.</p>
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