Getting Error MySQLi::Real_Connect(): (Hy000/2002): No Such File or Directory When I Try to Access My Project on Live Server

Getting error mysqli::real_connect(): (HY000/2002): No such file or directory when I try to access my project on live server

MySQL connection driver does not get any meaningful server at the location of localhost. So use,

'hostname' => '127.0.0.1' 

rather than

'hostname' => 'localhost'

mysqli::mysqli(): (HY000/2002): Can't connect to local MySQL server through socket 'MySQL' (2)

When you use just "localhost" the MySQL client library tries to use a Unix domain socket for the connection instead of a TCP/IP connection. The error is telling you that the socket, called MySQL, cannot be used to make the connection, probably because it does not exist (error number 2).

From the MySQL Documentation:

On Unix, MySQL programs treat the host name localhost specially, in a
way that is likely different from what you expect compared to other
network-based programs. For connections to localhost, MySQL programs
attempt to connect to the local server by using a Unix socket file.
This occurs even if a --port or -P option is given to specify a port
number. To ensure that the client makes a TCP/IP connection to the
local server, use --host or -h to specify a host name value of
127.0.0.1, or the IP address or name of the local server. You can also specify the connection protocol explicitly, even for localhost, by
using the --protocol=TCP option.

There are a few ways to solve this problem.

1. You can just use TCP/IP instead of the Unix socket. You would do this by using 127.0.0.1 instead of localhost when you connect. The Unix socket might by faster and safer to use, though.
2. You can change the socket in php.ini: open the MySQL configuration file my.cnf to find where MySQL creates the socket, and set PHP's mysqli.default_socket to that path. On my system it's /var/run/mysqld/mysqld.sock.

3. Configure the socket directly in the PHP script when opening the connection. For example:

   $db = new MySQLi('localhost', 'kamil', '***', '', 0, 
                                 '/var/run/mysqld/mysqld.sock')
   

Warning: mysqli_connect(): (HY000/2002): No such file or directory

Alright, I just found the solution. The problem turned out to be that the host shouldn't have been localhost, but 127.0.0.1. I always thought localhost and 127.0.0.1 was the same, but it turned out to be different.

So maybe as a tip for future users, always use the ip when in doubt.

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