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+---
+layout: post
+title:  "How to Get Applications to Launch at System Startup on macOS"
+date:   2022-03-19 23:32:00 +0800
+categories: note macos
+---
+
+macOS provides a task management framework called **launchd**. You can create tasks by placing XML files in a specific directory. **launchd** will run the task at a specified time according to the configuration in the XML. It is suitable for automating customized tasks, such as starting a web server at startup, backing up files regularly, etc.
+
+This is an example of starting a *Rails on Ruby* service at boot time.
+
+**Preparation**
+
+At first, determine the command to be run. In my case, the command to start *Rails on Ruby* is `
+rails server --environment=development --binding=0.0.0.0 --port=4000 --using=puma`, and the work directory is `/Users/xyw/git/Today`.
+
+**Create a Service**
+
+Create a **plist** file in  `~/Library/LaunchAgents/` directory. This is my plist file to start rails: 
+
+```xml
+<plist version="1.0">
+    <dict>
+        <key>Label</key>
+        <string>com.wxyucs.today</string>
+        <key>KeepAlive</key>
+        <true/>
+        <key>RunAtLoad</key>
+        <true/>
+        <key>WorkingDirectory</key>
+        <string>/Users/xyw/git/Today</string>
+        <key>ProgramArguments</key>
+        <array>
+            <string>/Users/xyw/.rbenv/shims/rails</string>
+            <string>server</string>
+            <string>--environment=development</string>
+            <string>--binding=0.0.0.0</string>
+            <string>--port=4000</string>
+            <string>--using=puma</string>
+        </array>
+        <key>StandardErrorPath</key>
+        <string>/tmp/today.err</string>
+        <key>StandardOutPath</key>
+        <string>/tmp/today.out</string>
+    </dict>
+</plist>
+```
+
+
+
+**Enable the Service**
+
+Now, enable the service:
+
+```bash
+$ launchctl load ~/Library/LaunchAgents/com.example.app.plist
+$ launchctl start com.example.app
+```
+
+**Disable the Service**
+
+If you no longer need this service at startup, you can disable with this command:
+
+```bash
+$ launchctl stop com.example.app
+```
+
+**Reference**
+
+- https://www.launchd.info/