“mysql.sock”是一种特殊类型的文件，用于与mysql服务器通信。相关文档在这里
https://dev.mysql.com/doc/refman/8.0/en/connecting.html

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: the client connects using a Unix socket file. 
The --socket option or the MYSQL_UNIX_PORT environment variable may be 
used to specify the socket name.

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和/或

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 (instead of 
localhost), or the IP address or name of the local server. You can also 
specify the transport protocol explicitly, even for localhost, by using 
the --protocol=TCP option.

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您希望防止创建mysql.sock文件，因为没有可靠的同步方法。下面是另一个讨论它的答案。
https://serverfault.com/questions/337818/how-to-force-mysql-to-connect-by-tcp-instead-of-a-unix-socket的