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Starting and Stopping Background Services with Homebrew - Junkman
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<h1>Starting and Stopping Background Services with Homebrew</h1>
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<span class="date">2015/12/14</span>
<span>posted in </span>
<span class="posted-in"><a href='OSX.html'>OSX</a></span>
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<p>@see <a href="https://robots.thoughtbot.com/starting-and-stopping-background-services-with-homebrew">https://robots.thoughtbot.com/starting-and-stopping-background-services-with-homebrew</a></p>
<p>I love <strong>Homebrew</strong>, but sometimes it really gets me down, you know? Especially when I have to deal with <code>launchctl</code>.</p>
<p><code>launchctl</code> loads and unloads services that start at login. In OS X, these services are represented by files ending with <code>.plist</code> (which stands for “property list”). These plists are usually stored in either <code>~/Library/LaunchAgents</code> or <code>/Library/LaunchAgents</code>. You load them (i.e. tell them to start at login) with <code>launchctl load $PATH_TO_LIST</code> and unload them with <code>launchctl unload $PATH_TO_LIST</code>. Loading a plist tells the program it represents (e.g. <code>redis</code>) to start at login, while unloading it tells the program not to start at login.</p>
<p>This post-install message from Homebrew may look familiar:</p>
<pre><code>To have launchd start mysql at login:
ln -sfv /usr/local/opt/mysql/*.plist ~/Library/LaunchAgents
Then to load mysql now:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
Or, if you don't want/need launchctl, you can just run:
mysql.server start
</code></pre>
<p>Doing all that takes too long, and I can never remember where Homebrew plists are. Fortunately, Homebrew includes a lovely interface for managing this without using ln, launchctl or knowing where plists are.</p>
<h2 id="toc_0">brew services</h2>
<p>First, install brew services by tapping homebrew/services (one time):</p>
<pre><code>brew tap homebrew/services
</code></pre>
<p>Here’s an example usage:</p>
<pre><code>$ brew services start mysql
==> Successfully started `mysql` (label: homebrew.mxcl.mysql)
</code></pre>
<p>Behind the scenes, <code>brew services start</code> is doing everything in the post-install message above. First it runs <code>ln -sfv ...</code> for you. Then it runs <code>launchctl load ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist</code>. It Just Works.</p>
<p>Let’s say MySQL’s acting funky. We can easily restart it:</p>
<pre><code>brew services restart mysql
Stopping `mysql`... (might take a while)
==> Successfully stopped `mysql` (label: homebrew.mxcl.mysql)
==> Successfully started `mysql` (label: homebrew.mxcl.mysql)
</code></pre>
<p>Now let’s see everything we’ve loaded:</p>
<pre><code>$ brew services list
redis started 442 /Users/gabe/Library/LaunchAgents/homebrew.mxcl.redis.plist
postgresql started 443 /Users/gabe/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
mongodb started 444 /Users/gabe/Library/LaunchAgents/homebrew.mxcl.mongodb.plist
memcached started 445 /Users/gabe/Library/LaunchAgents/homebrew.mxcl.memcached.plist
mysql started 87538 /Users/gabe/Library/LaunchAgents/homebrew.mxcl.mysql.plist
</code></pre>
<p>Note that the list of services includes services you started with <code>launchctl load</code>, not just services you loaded with <code>brew services</code></p>
<p>Let’s say we uninstalled MySQL and Homebrew didn’t remove the plist for some reason (it usually removes it for you). There’s a command for you:</p>
<pre><code>$ brew services cleanup
Removing unused plist /Users/gabe/Library/LaunchAgents/homebrew.mxcl.mysql.plist
</code></pre>
<p>Kachow.</p>
<h2 id="toc_1">Hidden Homebrew commands</h2>
<p>Homebrew ships with a whole bunch of commands that don’t show up in <code>brew --help</code>. You can see a list of them in the <a href="https://github.com/Homebrew/homebrew-boneyard/tree/master/cmd">Homebrew git repo</a>. Each file is named like <code>brew-COMMAND</code>, and you run them with <code>brew command</code>. I recommend <code>brew beer</code>.</p>
<p>What’s next</p>
<p>If you liked this, I recommend reading through Homebrew’s <a href="https://github.com/Homebrew/homebrew/wiki/Tips-N%27-Tricks">Tips and Tricks</a>. You can also try out another Homebrew extension for installing Mac apps: <code>homebrew-cask</code>.</p>
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