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Reorganising a Consul key-value store — David Winterbottom
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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>
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<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>$key<span style="color:#e6db74">"</span> > /dev/null
</span></span><span style="display:flex;"><span><span style="color:#f92672">}</span>
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>migrate_to_webserver_namespace<span style="color:#f92672">()</span> <span style="color:#f92672">{</span>
</span></span><span style="display:flex;"><span> keys_and_values | <span style="color:#66d9ef">while</span> read key value
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">do</span>
</span></span><span style="display:flex;"><span> set_key <span style="color:#e6db74">"WEBSERVER/</span>$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’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’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’s
<code>
select
</code>
syntax so this post is intended largely
as a personal reference on how to do this.
<a class="footnote-backref" role="doc-backlink">
↩︎
</a>
</p>
</li>
</ol>
</div>
</div>
<div id="article_meta">
<span class="hr">
——————
</span>
<p>
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<a>
Suggest an improvement
</a>
or
<a>
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</a>
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<a>
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</a>
)
<br>
Tagged with:
<a>
consul
</a>
,
<a>
bash
</a>
,
<a>
jq
</a>
<br>
Filed in:
<a>
tips
</a>
</p>
<p>
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<a>
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</a>
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<a>
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</p>
<p>
Copyright © 2005-2023
<a>
David Winterbottom
</a>
<br>
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<a>
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</a>
.
</p>
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