本实例要求下载并安装调试Mysql数据库。
第一步：下载Mysql数据库安装所需的全部软件。我已提前下载好数据库软件，直接在服务器下载即可，如下：
通过scp直接下载：
[root@agt20 ~]# scp root@192.168.122.10:/root/mysql* /root/
软件如下图：
[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
第二步：通过yum进行安装，起服务器并查看[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 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 ~]#
第三步：连接MySQL服务器，修改密码；1）查看初始密码
[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）使用初始密码连接mysql服务
[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）重置数据库管理员roo本机登录密码
mysql> alter user root@localhost identified by 'Pwd@123...';
Query OK, 0 rows affected (0.00 sec)
4）修改密码策略
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)
5）使用修改后的密码登录
[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>
至此Mysql数据库安装调试完成！！！！
。
。
。
。
。另外有需要云服务器可以了解下创新互联cdcxhl.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。
