[Bitrix\Main\DB\ConnectionException] 
Mysql connect error: Can't connect to local MySQL server through socket '/var/lib/mysqld/mysqld.sock' (2) (400)
#0: Bitrix\Main\DB\MysqlConnection->connectInternal()
	/home/bitrix/www/bitrix/modules/main/lib/db/mysqlconnection.php:71
#1: Bitrix\Main\DB\MysqlConnection->queryInternal("SELECT o.SITE_I...ROM b_option o " (63), array(0), 0, 0, null)
	/home/bitrix/www/bitrix/modules/main/lib/db/connection.php:155
#2: Bitrix\Main\DB\Connection->query("SELECT o.SITE_I...ROM b_option o " (63))
	/home/bitrix/www/bitrix/modules/main/lib/config/option.php:150
#3: Bitrix\Main\Config\Option::load("main", null)
	/home/bitrix/www/bitrix/modules/main/lib/config/option.php:36
#4: Bitrix\Main\Config\Option::get("main", "cookie_name", "BITRIX_SM")
	/home/bitrix/www/bitrix/modules/main/lib/httprequest.php:265
#5: Bitrix\Main\HttpRequest->prepareCookie(array(0))
	/home/bitrix/www/bitrix/modules/main/lib/httprequest.php:58
#6: Bitrix\Main\HttpRequest->__construct([Bitrix\Main\Server], array(0), array(0), array(0), array(0))
	/home/bitrix/www/bitrix/modules/main/lib/httpapplication.php:43
#7: Bitrix\Main\HttpApplication->initializeContext(array(6))
	/home/bitrix/www/bitrix/modules/main/lib/application.php:115
#8: Bitrix\Main\Application->initializeExtendedKernel(array(6))
	/home/bitrix/www/bitrix/modules/main/include.php:1
#9: require_once("/home/bitrix/ww...ain/include.php" (48))
	/home/bitrix/www/bitrix/modules/main/include/prolog_before.php:14
#10: require_once("/home/bitrix/ww...olog_before.php" (62))
	/home/bitrix/www/bitrix/modules/main/include/prolog.php:11
#11: require_once("/home/bitrix/ww...lude/prolog.php" (55))
	/home/bitrix/www/bitrix/header.php:1
#12: require("/home/bitrix/ww...trix/header.php" (34))
	/home/bitrix/www/about/howto/index.php:2