本實例要求下載并安裝調試Mysql數據庫。

第一步：下載Mysql數據庫安裝所需的全部軟件。

我已提前下載好數據庫軟件，直接在服務器下載即可，如下：

通過scp直接下載：

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

軟件如下圖：

[root@agt20 ~]# ls mysql-*mysql-5.7.17.tarmysql-community-client-5.7.17-1.el7.x86_64.rpmmysql-community-common-5.7.17-1.el7.x86_64.rpmmysql-community-devel-5.7.17-1.el7.x86_64.rpmmysql-community-embedded-5.7.17-1.el7.x86_64.rpmmysql-community-embedded-compat-5.7.17-1.el7.x86_64.rpmmysql-community-embedded-devel-5.7.17-1.el7.x86_64.rpmmysql-community-libs-5.7.17-1.el7.x86_64.rpmmysql-community-libs-compat-5.7.17-1.el7.x86_64.rpmmysql-community-minimal-debuginfo-5.7.17-1.el7.x86_64.rpmmysql-community-server-5.7.17-1.el7.x86_64.rpmmysql-community-test-5.7.17-1.el7.x86_64.rpm

第二步：通過yum進行安裝，起服務器并查看

[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 ServerLoaded: 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 agoDocs: man:mysqld(8)http://dev.mysql.com/doc/refman/en/using-systemd.htmlMain 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 ~]#

第三步：連接MySQL服務器，修改密碼；

1）查看初始密碼

[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）使用初始密碼連接mysql服務

[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 4Server version: 5.7.17Copyright (c) 2000, 2016, 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>

3）重置數據庫管理員roo本機登錄密碼

mysql> alter user root@localhost identified by 'Pwd@123...';Query OK, 0 rows affected (0.00 sec)

4）修改密碼策略

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)