注：该安装步骤转载于CSDN,下方配置为原创

按照图片安装并初始化完成MySQL等操作后进行；
安装对于rpm包集合
1-查看安装情况（有4个路径）
whereis mysql

2-查看服务状态
systemctl status mysql

3-初始化数据库
mysqld --initialize --console

4-目录授权
chown -R mysql:mysql /var/lib/mysql

5-启停mysql服务
systemctl start mysqld
systemctl stop mysqld
systemctl restart mysqld
systemctl enable mysqld (开机自启)

6-获取初始化的密码
grep ‘temporary password’ /var/log/mysqld.log

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登录mysql数据库的root账户
mysql -u root -p’密码’
1.修改密码（新版本需要先重置密码才能继续操作）
ALTER USER ‘root’@‘localhost’ IDENTIFIED BY ‘Root_123’;

2.退出然后用新密码登录
mysql -u root -p’Root_123’;

3.登录后在sqlplus状态下安装密码策略插件
install plugin validate_password soname ‘validate_password.so’;

4.查看安装的密码策略插件是否生效
select plugin_name, plugin_status from information_schema.plugins where plugin_name like ‘validate%’;

5.查看密码策强度略（高版本是xxx.xxx 低版本是xxx_xxx）
SHOW VARIABLES LIKE ‘validate_password%’;

6.修改密码策强度略
set global validate_password.policy=0;
set global validate_password.length=4;

7.指定用户-密码过期禁用（高版本默认不会过期好像）
ALTER USER ‘用户名’@‘localhost’ PASSWORD EXPIRE NEVER;

8.查看mysql下的用户以及密码限制
select user,host,password_expired,password_last_changed,password_lifetime from mysql.user;

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开放 root 账户远程登录
1-登录MySQL
mysql -u root -p’密码’

2-进入数据库
use mysql

3-修改user表
update user set host=‘%’ where user=‘root’;
mysql 5.7 及之前老版本，执行这行sql即可
GRANT ALL PRIVILEGES ON . TO ‘root’@‘%’ IDENTIFIED BY ‘你的密码’ WITH GRANT OPTION;

4-重载授权表
FLUSH PRIVILEGES;

5-退出
exit

6-重启
systemctl restart mysqld