错误内容：

Error: Failure while executing; `/bin/launchctl bootstrap gui/501 /Users/bruce/Library/LaunchAgents/homebrew.mxcl.mysql.plist` exited with 5.

• “homebrew.mxcl.mysql.plist” 是 Homebrew 安装的 MySQL 服务的启动配置文件。

查看启动文件内容：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>KeepAlive</key>
	<true/>
	<key>Label</key>
	<string>homebrew.mxcl.mysql</string>
	<key>LimitLoadToSessionType</key>
	<array>
		<string>Aqua</string>
		<string>Background</string>
		<string>LoginWindow</string>
		<string>StandardIO</string>
		<string>System</string>
	</array>
	<key>ProgramArguments</key>
	<array>
		<string>/opt/homebrew/opt/mysql/bin/mysqld_safe</string>
		<string>--datadir=/opt/homebrew/var/mysql</string>
	</array>
	<key>RunAtLoad</key>
	<true/>
	<key>WorkingDirectory</key>
	<string>/opt/homebrew/var/mysql</string>
</dict>
</plist>

1. 在终端中直接执行/opt/homebrew/opt/mysql/bin/mysqld_safe，查看提示，发现是有文件的权限不对。
2. ls -l [文件路径] 发现此文件与相同路径下的同级文件所有者不一致，其它都是用户，此文件所有者为root。
3. sudo chown -R [user] [文件路径] 更改所有者。
4. 再执行brew services start mysql，启动ok