mysql. What is the concept of sock

mysql.sock What is the concept of

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“mysql.sock” yes mysql Socket file for , yes mysql The host and client of are in the same host Last time , Use unix socket As the carrier of communication protocol . stay UNIX Local connection under series system MySQL May adopt TCP The connection and UNIX There are two methods of domain socket ; among UNIX Domain socket mode requires a socket file , You can use “show variables like 'socket'\G;” Command to view local socket file location .

The operating environment of this tutorial ：linux7.3 System 、mysql8 edition 、Dell G3 The computer .

“mysql.sock” yes mysql Socket file for .

stay UNIX Local connection under system MySQL May adopt UNIX Domain socket mode , This requires a socket file

The socket file can be defined by parameters socket control , You can use the following command to view the location of the file ：

show variables like 'socket'\G;

mysql.sock yes mysql The host and client of are in the same host Last time , Use unix domain socket As the carrier of communication protocol , It is better than tcp fast .

MySQL There are two main ways to connect ：

（1）TCP/IP

（2）socket

The most common one is TCP Connect ：

[[email protected] data]# mysql -h 192.168.103.67 -uroot -pEnter password: Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 14Server version: 8.0.15 MySQL Community Server - GPLCopyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>

Another way is this unix socket The connection of . Compare with... In speed tcp It's faster , But only for mysql With the application PC On , Rely on local .sock file . If it's not on the same station PC On , There's no way to connect .

Yes mysql.sock Come on , Its function is to program with MySQL Server On the same machine , Available when a local connection is initiated .

For example, you don't need to define a connection host The specific IP have to , As long as it is empty or empty localhost Can .

In this case , Even if you change MySQLl The outside of the port It's also possible to connect normally .

Because you are my.ini Medium or my.cnf After changing the port in ,mysql.sock Every time MySQL Server Start the generated . It has been changed according to you my.cnf Restart after mysql It was regenerated once , The information has changed .

So for external connections , Must be changed port To connect .

Linux Lower installation MySQL When connecting, you often reply that you can't find mysql.sock file , The solution is simple ：

If it is a new installation MySQL, Prompt file not found , Just search , Specify the correct location .

If mysql.sock If the document is deleted by mistake , You need to restart MySQL service , If the restart is successful, it will be in datadir Generate... Under directory mysql.sock Then you can specify .

If not, choose to use TCP Just connect the way you connect , Actually windows It also supports pipeline connection mode .

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