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   Reorganising a Consul key-value store &mdash; David Winterbottom
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     <h1 class="entry-title" id="article_title">
      Reorganising a Consul key-value store
     </h1>
     <div class="byline desktop_only">
      by
      <a class="author vcard">
       David Winterbottom
      </a>
      on
      <time class="published" datetime>
       Monday, 27 March 2017
      </time>
     </div>
     <div class="byline mobile_only">
      by
      <a class="author vcard">
       David Winterbottom
      </a>
      <br>
      <span class="article_date">
       on
       <time class="published" datetime>
        Monday, 27 March 2017
       </time>
      </span>
     </div>
     <div class="entry-content" id="article_content">
      <p>
       If your Consul key-value store is structured as:
      </p>
      <div class="highlight">
       <pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;" tabindex="0"><code class="language-sh" data-lang="sh"><span style="display:flex;"><span>/
</span></span><span style="display:flex;"><span>    A/
</span></span><span style="display:flex;"><span>        X <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>
</span></span><span style="display:flex;"><span>        Z <span style="color:#f92672">=</span> <span style="color:#ae81ff">2</span>
</span></span><span style="display:flex;"><span>        Y <span style="color:#f92672">=</span> <span style="color:#ae81ff">3</span>
</span></span><span style="display:flex;"><span>    C
</span></span><span style="display:flex;"><span>    D
</span></span></code></pre>
      </div>
      <p>
       but you now realise you should have namespaced everything within
       <code>
        WEBSERVER/
       </code>
       (or something like that):
      </p>
      <div class="highlight">
       <pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;" tabindex="0"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>/
</span></span><span style="display:flex;"><span>    WEBSERVER/
</span></span><span style="display:flex;"><span>        A/
</span></span><span style="display:flex;"><span>            X <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span>
</span></span><span style="display:flex;"><span>            Z <span style="color:#f92672">=</span> <span style="color:#ae81ff">2</span>
</span></span><span style="display:flex;"><span>            Y <span style="color:#f92672">=</span> <span style="color:#ae81ff">3</span>
</span></span><span style="display:flex;"><span>        C
</span></span><span style="display:flex;"><span>        D
</span></span></code></pre>
      </div>
      <p>
       then this Bash script will help you migrate:
      </p>
      <div class="highlight">
       <pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;" tabindex="0"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#75715e">#!/bin/bash
</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>
</span></span><span style="display:flex;"><span>set -e  <span style="color:#75715e"># Exit on error</span>
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#75715e"># Emit "key value" lines for all keys in Consul's KV store</span>
</span></span><span style="display:flex;"><span>keys_and_values<span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
</span></span><span style="display:flex;"><span>    <span style="color:#75715e"># Recursively fetch all values from Consul but exclude:</span>
</span></span><span style="display:flex;"><span>    <span style="color:#75715e"># (a) those that end in / (as these are folders)</span>
</span></span><span style="display:flex;"><span>    <span style="color:#75715e"># (b) those that start with WEBSERVER/ (as that's where we are migrating</span>
</span></span><span style="display:flex;"><span>    <span style="color:#75715e">#     to).</span>
</span></span><span style="display:flex;"><span>    curl -s <span style="color:#e6db74">"localhost/v1/kv/?recurse"</span> | jq -r <span style="color:#e6db74">'
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">        .[] |
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">        select(
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">            (.Key | endswith("/") | not) and
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">            (.Key | startswith("WEBSERVER") | not)
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">        ) |
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">        [.Key, " ", .Value] |
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">        add'</span> | <span style="color:#66d9ef">while</span> read key b64value
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">do</span>
</span></span><span style="display:flex;"><span>        <span style="color:#75715e"># Consul's REST API returns values base64-encoded so we decode here.</span>
</span></span><span style="display:flex;"><span>        echo $key <span style="color:#e6db74">`</span>echo <span style="color:#e6db74">"</span>$b64value<span style="color:#e6db74">"</span> | base64 -d<span style="color:#e6db74">`</span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">done</span>
</span></span><span style="display:flex;"><span><span style="color:#f92672">}</span>
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#75715e"># Set a new value in Consul's KV store</span>
</span></span><span style="display:flex;"><span>set_key<span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
</span></span><span style="display:flex;"><span>    key<span style="color:#f92672">=</span>$1
</span></span><span style="display:flex;"><span>    value<span style="color:#f92672">=</span>$2
</span></span><span style="display:flex;"><span>    curl -s -X PUT -d <span style="color:#e6db74">"</span>$value<span style="color:#e6db74">"</span> <span style="color:#e6db74">"localhost/v1/kv/</span>$key<span style="color:#e6db74">"</span> &gt; /dev/null
</span></span><span style="display:flex;"><span><span style="color:#f92672">}</span>
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>migrate_to_webserver_namespace<span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
</span></span><span style="display:flex;"><span>    keys_and_values | <span style="color:#66d9ef">while</span> read key value
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">do</span>
</span></span><span style="display:flex;"><span>        set_key <span style="color:#e6db74">"WEBSERVER/</span>$key<span style="color:#e6db74">"</span> <span style="color:#e6db74">"</span>$value<span style="color:#e6db74">"</span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">done</span>
</span></span><span style="display:flex;"><span><span style="color:#f92672">}</span>
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>migrate_to_webserver_namespace
</span></span></code></pre>
      </div>
      <p>
       This script uses
       <a>
        Consul&rsquo;s REST API
       </a>
       and filters
the results using
       <a>
        <code>
         jq
        </code>
       </a>
       <sup id="fnref:1">
        <a class="footnote-ref" role="doc-noteref">
         1
        </a>
       </sup>
       . It&rsquo;s easily
adapted to migrate key-value pairs between different namespaces.
      </p>
      <div class="footnotes" role="doc-endnotes">
       <hr>
       <ol>
        <li id="fn:1">
         <p>
          I can never remember jq&rsquo;s
          <code>
           select
          </code>
          syntax so this post is intended largely
as a personal reference on how to do this.&nbsp;
          <a class="footnote-backref" role="doc-backlink">
           &larrhk;︎
          </a>
         </p>
        </li>
       </ol>
      </div>
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       <a>
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