sudo rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm

sudo yum -y install mysql-community-server --enablerepo=mysql80-community --nogpgcheck

mysql -V
mysql  Ver 8.0.28 for Linux on x86_64 (MySQL Community Server - GPL)
 

systemctl start mysqld

systemctl enable mysqld

[root@hua30 ~]# grep 'temporary password' /var/log/mysqld.log
2022-03-21T07:55:57.425757Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: w;-14>ww2*E1
 

[root@huan30 ~]# mysql_secure_installation

# 1.重置root使用者初始化密碼
Enter password for user root: #輸入已獲取的root使用者初始密碼

The existing password for the user account root has expired. Please set a new password.

New password: #輸入新的MySQL密碼

Re-enter new password: #重複輸入新的MySQL密碼
The 'validate_password' component is installed on the server.
The subsequent steps will run with the existing configuration
of the component.
Using existing password for root.
Change the password for root ? ((Press y|Y for Yes, any other key for No) :Y #輸入Y選擇更新MySQL密碼。您也可以輸入N不再更新MySQL密碼。

New password: #輸入新的MySQL密碼

Re-enter new password: #重複輸入新的MySQL密碼

Estimated strength of the password: 100
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) :Y #輸入Y確認使用已設定的密碼。

# 2.刪除匿名使用者
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them. This is intended only for
testing, and to make the installation go a bit smoother.
You should remove them before moving into a production
environment.

Remove anonymous users? (Press y|Y for Yes, any other key for No) :Y #輸入Y刪除MySQL預設的匿名使用者。
Success.

# 3.禁止root賬號遠端登入
Normally, root should only be allowed to connect from
'localhost'. This ensures that someone cannot guess at
the root password from the network.

Disallow root login remotely? (Press y|Y for Yes, any other key for No) :Y #輸入Y禁止root遠端登入。
Success.
                                
# 4.刪除test庫以及test庫的訪問許可權
By default, MySQL comes with a database named 'test' that
anyone can access. This is also intended only for testing,
and should be removed before moving into a production
environment.


Remove test database and access to it? (Press y|Y for Yes, any other key for No) :Y #輸入Y刪除test庫以及對test庫的訪問許可權。
 - Dropping test database...
Success.

 - Removing privileges on test database...
Success.

# 5.重新載入授權表     
Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.

Reload privilege tables now? (Press y|Y for Yes, any other key for No) :Y #輸入Y重新載入授權表。
Success.

All done!
 

[root@hua30 ~]# systemctl status mysqld
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since 一 2022-03-21 15:56:00 CST; 16h ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
 Main PID: 23110 (mysqld)
   Status: "Server is operational"
    Tasks: 40
   Memory: 500.7M
   CGroup: /system.slice/mysqld.service
           └─23310 /usr/sbin/mysqld

3月 21 15:55:54 hua30 systemd[1]: Starting MySQL Server...
3月 21 15:56:00 hua30 systemd[1]: Started MySQL Server.

[root@hua30 ~]# find / -name mysql
/var/lib/mysql
/var/lib/mysql/mysql
/usr/bin/mysql
/usr/lib64/mysql
/etc/selinux/targeted/active/modules/100/mysql

[root@hua30 ~]# whereis mysql
mysql: /usr/bin/mysql /usr/lib64/mysql /usr/share/man/man1/mysql.1.gz

[root@hua30 ~]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 48
Server version: 8.0.28 MySQL Community Server - GPL

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

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.

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