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  <div class="section" id="merging-clusters">
<h1>Merging clusters<a class="headerlink" href="#merging-clusters" title="Permalink to this headline"></a></h1>
<p>With <code class="docutils literal"><span class="pre">cluster-merge</span></code> from the <code class="docutils literal"><span class="pre">tools</span></code> directory it is possible to
merge two or more clusters into one single cluster.</p>
<p>If anything goes wrong at any point the script suggests you rollback
steps you’ve to perform <em>manually</em> if there are any. The point of no
return is when the master daemon is started the first time after merging
the configuration files. A rollback at this point would involve a lot of
manual work.</p>
<p>For the internal design of this tool have a look at the <cite>Automated
Ganeti Cluster Merger &lt;design-2.1.rst&gt;</cite> document.</p>
<div class="section" id="merge-clusters">
<h2>Merge Clusters<a class="headerlink" href="#merge-clusters" title="Permalink to this headline"></a></h2>
<p>The tool has to be invoked on the cluster you like to merge the other
clusters into.</p>
<p>The usage of <code class="docutils literal"><span class="pre">cluster-merge</span></code> is as follows:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">cluster</span><span class="o">-</span><span class="n">merge</span> <span class="p">[</span><span class="o">--</span><span class="n">debug</span><span class="o">|--</span><span class="n">verbose</span><span class="p">]</span> <span class="p">[</span><span class="o">--</span><span class="n">watcher</span><span class="o">-</span><span class="n">pause</span><span class="o">-</span><span class="n">period</span> <span class="n">SECONDS</span><span class="p">]</span> \
<span class="p">[</span><span class="o">--</span><span class="n">groups</span> <span class="p">[</span><span class="n">merge</span><span class="o">|</span><span class="n">rename</span><span class="p">]]</span> <span class="o">&lt;</span><span class="n">cluster</span><span class="o">&gt;</span> <span class="p">[</span><span class="o">&lt;</span><span class="n">cluster</span><span class="o">...&gt;</span><span class="p">]</span>
</pre></div>
</div>
<p>You can provide multiple clusters. The tool will then go over every
cluster in serial and perform the steps to merge it into the invoking
cluster.</p>
<p>These options can be used to control the behaviour of the tool:</p>
<dl class="docutils">
<dt><code class="docutils literal"><span class="pre">--debug</span></code>/<code class="docutils literal"><span class="pre">--verbose</span></code></dt>
<dd>These options are mutually exclusive and increase the level of output
to either debug output or just more verbose output like action
performed right now.</dd>
<dt><code class="docutils literal"><span class="pre">--watcher-pause-period</span></code></dt>
<dd>Define the period of time in seconds the watcher shall be disabled,
default is 1800 seconds (30 minutes).</dd>
<dt><code class="docutils literal"><span class="pre">--groups</span></code></dt>
<dd>This option controls how <code class="docutils literal"><span class="pre">cluster-merge</span></code> handles duplicate node
group names on the merging clusters. If <code class="docutils literal"><span class="pre">merge</span></code> is specified then
all node groups with the same name will be merged into one. If
<code class="docutils literal"><span class="pre">rename</span></code> is specified, then conflicting node groups on the remove
clusters will have their cluster name appended to the group name. If
this option is not speicifed, then <code class="docutils literal"><span class="pre">cluster-merge</span></code> will refuse to
continue if it finds conflicting group names, otherwise it will
proceed as normal.</dd>
</dl>
</div>
<div class="section" id="rollback">
<h2>Rollback<a class="headerlink" href="#rollback" title="Permalink to this headline"></a></h2>
<p>If for any reason something in the merge doesn’t work the way it should
<code class="docutils literal"><span class="pre">cluster-merge</span></code> will abort, provide an error message and optionally
rollback steps. Please be aware that after a certain point there’s no
easy way to rollback the cluster to its previous state. If you’ve
reached that point the tool will not provide any rollback steps.</p>
<p>If you end up with rollback steps, please perform them before invoking
the tool again. It doesn’t keep state over invokations.</p>
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<li><a class="reference internal" href="#">Merging clusters</a><ul>
<li><a class="reference internal" href="#merge-clusters">Merge Clusters</a></li>
<li><a class="reference internal" href="#rollback">Rollback</a></li>
</ul>
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