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This example requires downloading and installing and debugging the Mysql database. Step 1: download all the software required for the Mysql database installation.

I have downloaded the database software in advance and can download it directly from the server, as follows:

Download directly through scp:

[root@agt20 ~] # scp root@192.168.122.10:/root/mysql* / root/

The software is shown below:

[root@agt20 ~] # ls mysql-*

Mysql-5.7.17.tar

Mysql-community-client-5.7.17-1.el7.x86_64.rpm

Mysql-community-common-5.7.17-1.el7.x86_64.rpm

Mysql-community-devel-5.7.17-1.el7.x86_64.rpm

Mysql-community-embedded-5.7.17-1.el7.x86_64.rpm

Mysql-community-embedded-compat-5.7.17-1.el7.x86_64.rpm

Mysql-community-embedded-devel-5.7.17-1.el7.x86_64.rpm

Mysql-community-libs-5.7.17-1.el7.x86_64.rpm

Mysql-community-libs-compat-5.7.17-1.el7.x86_64.rpm

Mysql-community-minimal-debuginfo-5.7.17-1.el7.x86_64.rpm

Mysql-community-server-5.7.17-1.el7.x86_64.rpm

Mysql-community-test-5.7.17-1.el7.x86_64.rpm

Step 2: install through yum, start the server and view

[root@agt20 ~] # yum-y install mysql-*.rpm

[root@agt20 ~] # systemctl restart mysqld

[root@agt20 ~] # systemctl enable mysqld

[root@agt20 ~] # systemctl status mysqld.service

\ u25cf mysqld.service-MySQL Server

Loaded: loaded (/ usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)

Active: active (running) since\ u4e8c 2019-10-15 11:29:11 CST; 1min 15s ago

Docs: man:mysqld (8)

Http://dev.mysql.com/doc/refman/en/using-systemd.html

Main PID: 31584 (mysqld)

CGroup: / system.slice/mysqld.service

\ u2514\ u250031584 / usr/sbin/mysqld-daemonize-pid-file=/var/run/mysqld/mysqld.pid...

10\ u6708 15 11:28:42 agt20.tedu.cn systemd [1]: Starting MySQL Server...

10\ u6708 15 11:29:11 agt20.tedu.cn systemd [1]: Started MySQL Server.

[root@agt20 ~] #

Step 3: connect to the MySQL server and change the password

1) View the initial password

[root@agt20] # grep-I 'password' / var/log/mysqld.log

2019-10-15T03:28:55.200931Z 1 [Note] A temporary password is generated for root@localhost: r3qhDysMrM)

2) connect to the mysql service using the initial password

[root@agt20 ~] # mysql-uroot-p'r3qhDysMrM)'

Mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with; or\ g.

Your MySQL connection id is 4

Server version: 5.7.17

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

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 >

3) reset the local login password of the database administrator roo

Mysql > alter user root@localhost identified by 'Pwd@123...'

Query OK, 0 rows affected (0.00 sec)

4) modify password policy

Mysql > set global validate_password_policy=0

Query OK, 0 rows affected (0.01 sec)

Mysql > set global validate_password_length=6

Query OK, 0 rows affected (0.00 sec)

Mysql > alter user root@localhost identified by 'pwd@123'

Query OK, 0 rows affected (0.00 sec)

5) Log in with the modified password

[root@agt20] # mysql-uroot-ppwd@123

Mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with; or\ g.

Your MySQL connection id is 5

Server version: 5.7.17 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

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 >

At this point, the installation and debugging of Mysql database is complete! . . . . .

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