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<title>Changing a MySQL user password across multiple application instances without downtime - Sipmann</title>
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<meta name="description" content="Are you in need to change the password for a MySQL User without downtime? With the new feature on version 8.0.14, this is possible. Come check it out.">
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<h1><b><a href="https://www.sipmann.com/mysql-dual-password-functionality.html" title="Permalink to Changing a MySQL user password across multiple application instances without downtime">Changing a MySQL user password across multiple application instances without downtime</a></b></h1>
<h5>
<i class="fa fa-calendar"></i><time class="w3-opacity" datetime="2020-12-09T13:40:00-03:00"> Wed 09 December 2020</time>
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<p><p>Do you need to change the password of a MySQL user that it's being used in an application, and can't allow a single downtime? Well, MySQL 8.0.14 came with a feature called <a href="https://dev.mysql.com/doc/refman/8.0/en/password-management.html#dual-passwords">Dual Password Support</a>, with it you can change the password keeping the previous password as a kind of backup. That way you still can log in using the old password or can start using the new one. With that, the password change workflow it's the following.</p>
<p>1) Change password keeping the old one;</p>
<p>2) Deploy the new config to your app/cluster;</p>
<p>3) Discard the old password.</p>
<p>To change the password and keep the old one, you have the following command.</p>
<div class="highlight"><pre><span></span><code><span class="k">ALTER</span> <span class="n">USER</span> <span class="s1">'appuser'</span><span class="o">@</span><span class="s1">'localhost'</span> <span class="n">IDENTIFIED</span> <span class="k">BY</span> <span class="s1">'new_password'</span> <span class="n">RETAIN</span> <span class="n">CURRENT</span> <span class="n">PASSWORD</span><span class="p">;</span>
</code></pre></div>
<p>To discard the old one, run the following.</p>
<div class="highlight"><pre><span></span><code><span class="k">ALTER</span> <span class="n">USER</span> <span class="s1">'appuser'</span><span class="o">@</span><span class="s1">'localhost'</span> <span class="n">DISCARD</span> <span class="n">OLD</span> <span class="n">PASSWORD</span><span class="p">;</span>
</code></pre></div>
<p>And you are done. Hope you find it as useful as I :)</p></p>
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<h4>Translations:</h4>
<ul>
<li><a href="../pt/mysql-dual-password-functionality.html">pt - Trocando a senha de um usuário do MySQL sem downtime da aplicação</a></li>
</ul>
</section>
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