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blog/2021/10/11/replacing-docker-with-podman-on-macos-and-linux/index.html
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<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>
<p>This post briefly describes my experience swapping out docker for podman on macOS.</p>
<h3 id=what-is-a-container>What is a container?</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 mnt, pid, net, ipc, uid, cgroup, and time. 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>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. Linux namespaces help provide an isolated view of the system, including mnt, pid, net, ipc, uid, cgroup, and time. 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>
<h3 id=benefits-of-podman>Benefits of Podman</h3>
<p>One of the most interesting features of Podman is that it is daemonless. There isn&rsquo;t a process running on your system managing your containers. In contrast, the docker client is reliant upon the docker daemon (often running as root) to be able to build and run containers.</p>