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blog/2021/10/11/replacing-docker-with-podman-on-macos-and-linux/index.html
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<p>There are a number of reasons why you might want to replace docker, especially on macOS. The following feature bundled in Docker Desktop might have motivated you enough to consider replacing docker:</p>
<blockquote class=twitter-tweet><p lang=en dir=ltr>...ignoring Docker updates is a paid feature now?? <a href=https://t.co/ZxKW3b9LQM>pic.twitter.com/ZxKW3b9LQM</a></p>&mdash; Brendan Dolan-Gavitt (@moyix) <a href="https://twitter.com/moyix/status/1388586550682861568?ref_src=twsrc%5Etfw">May 1, 2021</a></blockquote>
<script async src=https://platform.twitter.com/widgets.js></script>
<p>Docker has been one of the larger influencers in the container world, helping to standardize the <a href=https://github.com/opencontainers/image-spec/blob/main/spec.md>OCI Image Format Specification</a>. For many developers, containers have become synonymous with terms like <code>docker</code> and <code>Dockerfile</code> (a file containing build instructions for an image). Docker has certainly made it very convenient to build and run containers, but it is not the only solution for doing so.</p>
<p>Docker has been one of the larger influencers in the container world, helping to standardize the <a href=https://github.com/opencontainers/image-spec/blob/main/spec.md>OCI Image Format Specification</a>. For many developers, containers have become synonymous with terms like <code>docker</code> and <code>Dockerfile</code> (a file containing build instructions for a container image). Docker has certainly made it very convenient to build and run containers, but it is not the only solution for doing so.</p>
<h3 id=what-are-containers>What are containers?</h3>
<p>A container is a standard unit of software that packages up all application dependencies within it. Multiple containers can be run on a host machine all sharing the same kernel as the host. In Linux, namespaces help provide an isolated view of the system: including networking, PIDs, UIDs, and mounts. There is an <a href="https://www.youtube.com/watch?v=sK5i-N34im8">in-depth video</a> that discusses what containers are made from, and <a href="https://youtu.be/sK5i-N34im8?t=2468">near the end</a> there is a demonstration on how to build your own containers from the command line.</p>
<p>By easily allowing the necessary dependencies to live alongside the application code, containers make the &ldquo;works on my machine&rdquo; problem less of a problem.</p>