好久没用本地mysql,启动报错，还以为本机没装

其实是因为osx升级到Yosemite之后引起的开机不自动启动
解决方法：1.手动启动
sudo -s /usr/local/mysql/bin/mysqld_safe --user=mysql &

2.创建一个新文件：/Library/LaunchDaemons/com.mysql.mysql.plist

  

    KeepAlive

    

    Label

    com.mysql.mysqld

    ProgramArguments

    

      /usr/local/mysql/bin/mysqld_safe

      --user=mysql

    

  

2.1更新权限并添加到 launchctl

sudo chown root:wheel /Library/LaunchDaemons/com.mysql.mysql.plist

sudo chmod 644 /Library/LaunchDaemons/com.mysql.mysql.plist

sudo launchctl load -w /Library/LaunchDaemons/com.mysql.mysql.plist

这是由于 Yosemite 废弃了 StartupItems 导致的