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<title>15. Messaging — cdist 4.3.0 documentation</title>
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4.3.0
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<ul class="current">
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<li class="toctree-l1"><a class="reference internal" href="cdist-intro.html">1. cdist - usable configuration management</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-why.html">2. Why should I use cdist?</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-os.html">3. Supported Operating Systems</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-install.html">4. How to install cdist</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-update.html">5. How to update cdist</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-support.html">6. Support</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-features.html">7. Features</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-quickstart.html">8. Quickstart</a></li>
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<li class="toctree-l1"><a class="reference internal" href="man1/cdist.html">9. cdist(1)</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-bootstrap.html">10. Bootstrap</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-manifest.html">11. Manifest</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-type.html">12. cdist type</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-types.html">13. cdist types</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-explorer.html">14. Explorer</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">15. Messaging</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#description">15.1. Description</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#availability">15.2. Availability</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#examples">15.3. Examples</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-parallelization.html">16. Parallelization</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-reference.html">17. Reference</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-best-practice.html">18. Best practice</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-stages.html">19. Execution stages</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-remote-exec-copy.html">20. Remote exec and copy commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-hacker.html">21. Hacking</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cdist-troubleshooting.html">22. Troubleshooting</a></li>
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<li><a href="index.html">Docs</a> »</li>
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<li>15. Messaging</li>
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<a href="_sources/cdist-messaging.txt" rel="nofollow"> View page source</a>
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<div class="section" id="messaging">
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<h1>15. Messaging<a class="headerlink" href="#messaging" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="description">
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<h2>15.1. Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>cdist has a simple but powerful way of allowing communication between
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the initial manifest and types as well as types and types.</p>
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<p>Whenever execution is passed from cdist to one of the
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scripts described below, cdist generate 2 new temporary files
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and exports the environment variables <strong>__messages_in</strong> and
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<strong>__messages_out</strong> to point to them.</p>
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<p>Before handing over the control, the content of the global message
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file is copied into the file referenced by <strong>$__messages_in</strong>.</p>
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<p>After cdist gained control back, the content of the file referenced
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by <strong>$__messages_out</strong> is appended to the global message file.</p>
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<p>This way overwriting any of the two files by accident does not
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interfere with other types.</p>
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<p>The order of execution is not defined unless you create dependencies
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between the different objects (see <a class="reference external" href="cdist-manifest.html">cdist manifest</a>) and thus you
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can only react reliably on messages by objects that you depend on.</p>
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</div>
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<div class="section" id="availability">
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<h2>15.2. Availability<a class="headerlink" href="#availability" title="Permalink to this headline">¶</a></h2>
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<p>Messaging is possible between all <strong>local</strong> scripts:</p>
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<ul class="simple">
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<li>initial manifest</li>
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<li>type/manifest</li>
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<li>type/gencode-local</li>
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<li>type/gencode-remote</li>
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</ul>
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</div>
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<div class="section" id="examples">
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<h2>15.3. Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<p>When you want to emit a message use:</p>
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<div class="highlight-sh"><div class="highlight"><pre><span></span><span class="nb">echo</span> <span class="s2">"something"</span> >> <span class="s2">"</span><span class="nv">$__messages_out</span><span class="s2">"</span>
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</pre></div>
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</div>
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<p>When you want to react on a message use:</p>
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<div class="highlight-sh"><div class="highlight"><pre><span></span><span class="k">if</span> grep -q <span class="s2">"^__your_type/object/id:something"</span> <span class="s2">"</span><span class="nv">$__messages_in</span><span class="s2">"</span><span class="p">;</span> <span class="k">then</span>
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<span class="nb">echo</span> <span class="s2">"I do something else"</span>
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<span class="k">fi</span>
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</pre></div>
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</div>
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<p>Some real life examples:</p>
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<div class="highlight-sh"><div class="highlight"><pre><span></span><span class="c1"># Reacting on changes from block for keepalive</span>
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<span class="k">if</span> grep -q <span class="s2">"^__block/keepalive-vrrp"</span> <span class="s2">"</span><span class="nv">$__messages_in</span><span class="s2">"</span><span class="p">;</span> <span class="k">then</span>
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<span class="nb">echo</span> /etc/init.d/keepalived restart
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<span class="k">fi</span>
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<span class="c1"># Reacting on changes of configuration files</span>
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<span class="k">if</span> grep -q <span class="s2">"^__file/etc/one"</span> <span class="nv">$__messages_in</span><span class="p">;</span> <span class="k">then</span>
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<span class="nb">echo</span> <span class="s1">'for init in /etc/init.d/opennebula*; do $init restart; done'</span>
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<span class="k">fi</span>
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</pre></div>
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</div>
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<p>Restart sshd on changes</p>
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<div class="highlight-sh"><div class="highlight"><pre><span></span><span class="nv">os</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>cat <span class="s2">"</span><span class="nv">$__global</span><span class="s2">/explorer/os"</span><span class="k">)</span><span class="s2">"</span>
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<span class="k">case</span> <span class="s2">"</span><span class="nv">$os</span><span class="s2">"</span> in
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centos<span class="p">|</span>redhat<span class="p">|</span>suse<span class="o">)</span>
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<span class="nv">restart</span><span class="o">=</span><span class="s2">"/etc/init.d/sshd restart"</span>
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<span class="p">;;</span>
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debian<span class="p">|</span>ubuntu<span class="o">)</span>
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<span class="nv">restart</span><span class="o">=</span><span class="s2">"/etc/init.d/ssh restart"</span>
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<span class="p">;;</span>
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*<span class="o">)</span>
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cat <span class="s"><< eof >&2</span>
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<span class="s">Unsupported os $os.</span>
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<span class="s">If you would like to have this type running on $os,</span>
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<span class="s">you can either develop the changes and send a pull</span>
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<span class="s">request or ask for a quote at www.ungleich.ch</span>
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<span class="s">eof</span>
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<span class="nb">exit</span> 1
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<span class="p">;;</span>
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<span class="k">esac</span>
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<span class="k">if</span> grep -q <span class="s2">"^__key_value/PermitRootLogin"</span> <span class="s2">"</span><span class="nv">$__messages_in</span><span class="s2">"</span><span class="p">;</span> <span class="k">then</span>
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<span class="nb">echo</span> <span class="nv">$restart</span>
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<span class="k">fi</span>
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</pre></div>
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</div>
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</div>
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