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blog/2021/10/11/replacing-docker-with-podman-on-macos-and-linux/index.html
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@@ -145,7 +145,7 @@ personal blog
<time class=entry-date datetime=2021-10-11T10:43:35-04:00>2021, Oct 11</time>
</span>
<span class=reading-time><svg class="icon" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" aria-hidden="true"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 15 15"/></svg>
4 mins read
5 mins read
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@@ -170,7 +170,8 @@ personal blog
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-sh data-lang=sh><span style=color:#09f;font-style:italic># This is not necessary on Linux</span>
podman machine init
podman machine start
</code></pre></div><p>Let&rsquo;s try to pull an image:</p>
</code></pre></div><h3 id=running-a-container>Running a container</h3>
<p>Let&rsquo;s try to pull an image:</p>
<pre tabindex=0><code class=language-console data-lang=console>$ podman pull alpine
Trying to pull docker.io/library/alpine:latest...
Getting image source signatures
@@ -182,20 +183,20 @@ Storing signatures
</code></pre><blockquote>
<p>If you&rsquo;re having an issue pulling images, you may need to remove <code>~/.docker/config.json</code> or remove the set of auths in the configuration as mentioned <a href=https://stackoverflow.com/a/69121873/1191286>here</a>.</p>
</blockquote>
<p>and then exec into the container:</p>
<p>and then run and exec into a container:</p>
<pre tabindex=0><code class=language-console data-lang=console>$ podman run --rm -ti alpine
Error: error preparing container 99ace1ef8a78118e178372d91fd182e8166c399fbebe0f676af59fbf32ce205b for attach: error configuring network namespace for container 99ace1ef8a78118e178372d91fd182e8166c399fbebe0f676af59fbf32ce205b: error adding pod unruffled_bohr_unruffled_bohr to CNI network &quot;podman&quot;: unexpected end of JSON input
</code></pre><p>What does this error mean? A bit of searching lead to <a href=https://github.com/containers/podman/issues/11837>this github issue</a>.</p>
<p>Until the fix is released, a workaround is to just specify a port (even when it&rsquo;s not needed):</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-sh data-lang=sh>podman run -p <span style=color:#f60>4242</span> --rm -ti alpine
</code></pre></div><p>If you&rsquo;re reading this from the future, there is a good chance specifying a port won&rsquo;t be needed.</p>
<p>Documentation such as <a href=https://jellyfin.org/docs/general/administration/installing.html#podman>Jellyfin&rsquo;s</a> even include steps for podman.</p>
<h3 id=aliasing-docker-with-podman>Aliasing docker with podman</h3>
<p>Force of habit (or other scripts) may have you calling <code>docker</code>. To work around this:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-sh data-lang=sh><span style=color:#366>alias</span> <span style=color:#033>docker</span><span style=color:#555>=</span>podman
</code></pre></div><h3 id=podman-compose>podman-compose</h3>
<p>You may be wondering: what about docker-compose? Well, there happens to be a drop-in replacement for it: <a href=https://github.com/containers/podman-compose>podman-compose</a>.</p>
<p>You may be wondering: what about docker-compose? Well, there <em>claims</em> to be a drop-in replacement for it: <a href=https://github.com/containers/podman-compose>podman-compose</a>.</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-sh data-lang=sh>pip3 install --user podman-compose
<span style=color:#366>alias</span> docker-compose<span style=color:#555>=</span>podman-compose
</code></pre></div><p>Now let&rsquo;s create a <code>docker-compose.yml</code> file to test:</p>
<div class=highlight><pre tabindex=0 style=background-color:#f0f3f3;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-sh data-lang=sh>cat <span style=color:#c30>&lt;&lt; EOF &gt;&gt; docker-compose.yml
</span><span style=color:#c30>version: &#39;2&#39;
@@ -205,7 +206,7 @@ Error: error preparing container 99ace1ef8a78118e178372d91fd182e8166c399fbebe0f6
</span><span style=color:#c30> command: [/bin/echo, &#39;Hello world&#39;]
</span><span style=color:#c30>EOF</span>
</code></pre></div><p>Now run:</p>
<pre tabindex=0><code class=language-console data-lang=console>$ docker-compose up
<pre tabindex=0><code class=language-console data-lang=console>$ podman-compose up
podman pod create --name=davegallant.github.io --share net
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