使用tp框架 3.2.3 ，在windows上跑的时候没有任何问题，但是部署到linux系统和是哪个，就会报这个错，不知道什么原因，求大神解答

:(

SQLSTATE[HY000] [2002] No such file or directory

错误位置

FILE: /phpstudy/www/mmm/ThinkPHP/Library/Think/Db/Driver.class.php 　LINE: 109

TRACE

#0 /phpstudy/www/mmm/ThinkPHP/Library/Think/Db/Driver.class.php(109): E('SQLSTATE[HY000]...')

#1 /phpstudy/www/mmm/ThinkPHP/Library/Think/Db/Driver.class.php(1075): Think\Db\Driver->connect()

#2 /phpstudy/www/mmm/ThinkPHP/Library/Think/Db/Driver/Mysql.class.php(47): Think\Db\Driver->initConnect(true)

#3 /phpstudy/www/mmm/ThinkPHP/Library/Think/Model.class.php(138): Think\Db\Driver\Mysql->getFields('inkks_xin')

#4 /phpstudy/www/mmm/ThinkPHP/Library/Think/Model.class.php(126): Think\Model->flush()

#5 /phpstudy/www/mmm/ThinkPHP/Library/Think/Model.class.php(1458): Think\Model->_checkTableInfo()

#6 /phpstudy/www/mmm/ThinkPHP/Library/Think/Model.class.php(101): Think\Model->db(0, '', true)

#7 /phpstudy/www/mmm/ThinkPHP/Common/functions.php(621): Think\Model->__construct('xin', '', '')

#8 /phpstudy/www/mmm/appx/Home/Controller/IndexController.class.php(9): M('xin')

#9 [internal function]: Home\Controller\IndexController->index()

#10 /phpstudy/www/mmm/ThinkPHP/Library/Think/App.class.php(173): ReflectionMethod->invoke(object(Home\Controller\IndexController))

#11 /phpstudy/www/mmm/ThinkPHP/Library/Think/App.class.php(110): Think\App::invokeAction(object(Home\Controller\IndexController), 'index')

#12 /phpstudy/www/mmm/ThinkPHP/Library/Think/App.class.php(204): Think\App::exec()

#13 /phpstudy/www/mmm/ThinkPHP/Library/Think/Think.class.php(120): Think\App::run()

#14 /phpstudy/www/mmm/ThinkPHP/ThinkPHP.php(97): Think\Think::start()

#15 /phpstudy/www/mmm/index.php(7): require('/phpstudy/www/m...')

#16 {main}

pdo_mysql.default_socket=/var/lib/mysql/mysql.sock

socket=/var/lib/mysql/mysql.sock