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Reorganising a Consul key-value store — David Winterbottom |
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Reorganising a Consul key-value store |
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</h1> |
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<div class="byline desktop_only"> |
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by |
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David Winterbottom |
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on |
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<time class="published" datetime> |
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Monday, 27 March 2017 |
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by |
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<a class="author vcard"> |
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David Winterbottom |
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<br> |
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<span class="article_date"> |
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on |
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<time class="published" datetime> |
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Monday, 27 March 2017 |
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<div class="entry-content" id="article_content"> |
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<p> |
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If your Consul key-value store is structured as: |
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<div class="highlight"> |
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<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>/ |
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</span></span><span style="display:flex;"><span> A/ |
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</span></span><span style="display:flex;"><span> X <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span> |
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</span></span><span style="display:flex;"><span> Z <span style="color:#f92672">=</span> <span style="color:#ae81ff">2</span> |
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</span></span><span style="display:flex;"><span> Y <span style="color:#f92672">=</span> <span style="color:#ae81ff">3</span> |
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</span></span><span style="display:flex;"><span> C |
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</span></span><span style="display:flex;"><span> D |
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</span></span></code></pre> |
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<p> |
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but you now realise you should have namespaced everything within |
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<code> |
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WEBSERVER/ |
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</code> |
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(or something like that): |
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</p> |
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<div class="highlight"> |
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<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>/ |
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</span></span><span style="display:flex;"><span> WEBSERVER/ |
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</span></span><span style="display:flex;"><span> A/ |
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</span></span><span style="display:flex;"><span> X <span style="color:#f92672">=</span> <span style="color:#ae81ff">1</span> |
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</span></span><span style="display:flex;"><span> Z <span style="color:#f92672">=</span> <span style="color:#ae81ff">2</span> |
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</span></span><span style="display:flex;"><span> Y <span style="color:#f92672">=</span> <span style="color:#ae81ff">3</span> |
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</span></span><span style="display:flex;"><span> C |
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</span></span><span style="display:flex;"><span> D |
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</span></span></code></pre> |
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</div> |
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<p> |
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then this Bash script will help you migrate: |
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</p> |
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<div class="highlight"> |
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<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 |
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</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span> |
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</span></span><span style="display:flex;"><span>set -e <span style="color:#75715e"># Exit on error</span> |
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</span></span><span style="display:flex;"><span> |
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</span></span><span style="display:flex;"><span><span style="color:#75715e"># Emit "key value" lines for all keys in Consul's KV store</span> |
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</span></span><span style="display:flex;"><span>keys_and_values<span style="color:#f92672">()</span> <span style="color:#f92672">{</span> |
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</span></span><span style="display:flex;"><span> <span style="color:#75715e"># Recursively fetch all values from Consul but exclude:</span> |
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</span></span><span style="display:flex;"><span> <span style="color:#75715e"># (a) those that end in / (as these are folders)</span> |
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</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> |
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</span></span><span style="display:flex;"><span> <span style="color:#75715e"># to).</span> |
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</span></span><span style="display:flex;"><span> curl -s <span style="color:#e6db74">"localhost/v1/kv/?recurse"</span> | jq -r <span style="color:#e6db74">' |
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</span></span></span><span style="display:flex;"><span><span style="color:#e6db74"> .[] | |
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</span></span></span><span style="display:flex;"><span><span style="color:#e6db74"> select( |
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</span></span></span><span style="display:flex;"><span><span style="color:#e6db74"> (.Key | endswith("/") | not) and |
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</span></span></span><span style="display:flex;"><span><span style="color:#e6db74"> (.Key | startswith("WEBSERVER") | not) |
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</span></span></span><span style="display:flex;"><span><span style="color:#e6db74"> ) | |
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</span></span></span><span style="display:flex;"><span><span style="color:#e6db74"> [.Key, " ", .Value] | |
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</span></span></span><span style="display:flex;"><span><span style="color:#e6db74"> add'</span> | <span style="color:#66d9ef">while</span> read key b64value |
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">do</span> |
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</span></span><span style="display:flex;"><span> <span style="color:#75715e"># Consul's REST API returns values base64-encoded so we decode here.</span> |
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</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> |
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</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">done</span> |
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</span></span><span style="display:flex;"><span><span style="color:#f92672">}</span> |
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</span></span><span style="display:flex;"><span> |
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</span></span><span style="display:flex;"><span><span style="color:#75715e"># Set a new value in Consul's KV store</span> |
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</span></span><span style="display:flex;"><span>set_key<span style="color:#f92672">()</span> <span style="color:#f92672">{</span> |
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</span></span><span style="display:flex;"><span> key<span style="color:#f92672">=</span>$1 |
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</span></span><span style="display:flex;"><span> value<span style="color:#f92672">=</span>$2 |
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</span></span><span style="display:flex;"><span> curl -s -X PUT -d <span style="color:#e6db74">"</span>$value<span style="color:#e6db74">"</span> <span style="color:#e6db74">"localhost/v1/kv/</span>$key<span style="color:#e6db74">"</span> > /dev/null |
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</span></span><span style="display:flex;"><span><span style="color:#f92672">}</span> |
|
</span></span><span style="display:flex;"><span> |
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</span></span><span style="display:flex;"><span>migrate_to_webserver_namespace<span style="color:#f92672">()</span> <span style="color:#f92672">{</span> |
|
</span></span><span style="display:flex;"><span> keys_and_values | <span style="color:#66d9ef">while</span> read key value |
|
</span></span><span style="display:flex;"><span> <span style="color:#66d9ef">do</span> |
|
</span></span><span style="display:flex;"><span> set_key <span style="color:#e6db74">"WEBSERVER/</span>$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> |
|
Something wrong? |
|
<a> |
|
Suggest an improvement |
|
</a> |
|
or |
|
<a> |
|
add a comment |
|
</a> |
|
(see |
|
<a> |
|
article history |
|
</a> |
|
) |
|
<br> |
|
Tagged with: |
|
<a> |
|
consul |
|
</a> |
|
, |
|
<a> |
|
bash |
|
</a> |
|
, |
|
<a> |
|
jq |
|
</a> |
|
<br> |
|
Filed in: |
|
<a> |
|
tips |
|
</a> |
|
</p> |
|
<p> |
|
Previous: |
|
<a> |
|
Lies you're told on a software project |
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</a> |
|
<br> |
|
Next: |
|
<a> |
|
Podcast.__init__ on Oscar |
|
</a> |
|
</p> |
|
<p> |
|
Copyright © 2005-2023 |
|
<a> |
|
David Winterbottom |
|
</a> |
|
<br> |
|
Content licensed under |
|
<a> |
|
CC BY-NC-SA 4.0 |
|
</a> |
|
. |
|
</p> |
|
</div> |
|
</div> |
|
</div> |
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</article> |
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</body> |
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</html> |
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