mysql安裝啟動都是正常沒有報錯
到登錄的時候就報錯
[root@localhost home]# mysql
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/home/mysql/mysql.sock’ (2)

查看mysql進程
[root@localhost home]# ps -aux |grep mysql
root 38892 0.0 0.0 11820 1596 pts/0 S 09:05 0:00 /bin/sh /home/mysql/bin/mysqld_safe --datadir=/home/mysql/data --pid-file=/home/mysql/data/mysqld.pid
mysql 39428 1.0 35.5 8296856 664436 pts/0 Sl 09:05 0:00 /home/mysql/bin/mysqld --basedir=/home/mysql --datadir=/home/mysql/data --plugin-dir=/home/mysql/lib/plugin --user=mysql --log-error=/home/mysql/logs/mysql.log --pid-file=/home/mysql/data/mysqld.pid --socket=/home/mysql/data/mysql.sock

進程是正常

查看日志
2020-10-20T01:05:36.462291Z 0 [Note] Event Scheduler: Loaded 0 events
2020-10-20T01:05:36.462419Z 1 [Note] Event Scheduler: scheduler thread started with id 1
2020-10-20T01:05:36.462427Z 0 [Note] /home/mysql/bin/mysqld: ready for connections.
Version: ‘5.7.31-log’ socket: ‘/home/mysql/data/mysql.sock’ port: 3306 Source distribution

服務的sock文件是在/home/mysql/data/mysql.sock，而登錄報錯說/home/mysql這個下面沒文件，這個問題的處理辦法可以做一個軟鏈接將文件指定到/home/mysql/就可以
[root@localhost data]# ln -s /home/mysql/data/mysql.sock /home/mysql/mysql.sock

在重新登錄

[root@localhost data]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.31-log Source distribution

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Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql>

登錄成功

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