<p>So I know how to create a new builder for <code>buildx</code> in a Kubernetes cluster before starting a build with <code>buildx</code> e.g. from outside:</p>
<pre><code>docker buildx create --driver kubernetes --use
docker buildx build .
</code></pre>
<p>But could I also instruct <code>buildx</code> to connect a corresponding builder that was created indepenently? I've been looking for a configuration file where Docker/<code>buildx</code> might store  relevant information, but have not found it yet. I've tried this with Docker 20.10.1.</p>

rookie099
<p>You can run <code>docker buildx ls</code> to list the builders and <code>docker buildx use</code> to set the the current instance (or the default one with the <code>--default</code> flag). The config files for builders are located in <code>~/.docker/buildx/instances</code>, I believe, at least in Docker version 20.10.5.</p>
