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[[email protected] ~]# yum list installed | grep mariadb 

mariadb-libs.x86_64                  1:5.5.56-2.el7                    @anaconda

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wget https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm

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rpm -ivh mysql80-community-release-el7-1.noarch.rpm

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[[email protected] src]# yum repolist enabled | grep "mysql.*-community.*"

mysql-connectors-community/x86_64       MySQL Connectors Community           51

mysql-tools-community/x86_64            MySQL Tools Community                63

mysql80-community/x86_64                MySQL 8.0 Community Server           17

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yum -y  install mysql-server

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[[email protected] ~]# service mysqld start 

Redirecting to /bin/systemctl start mysqld.service

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[[email protected] ~]# cat /var/log/mysqld.log|grep 'A temporary password'

2018-05-18T02:01:17.558742Z 5 [Note] [MY-010454] [Server] A temporary password is generated for [email protected]: belPU>iuF4*H

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[[email protected] ~]# mysql -uroot -p

Enter password:

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

Your MySQL connection id is 10

Server version: 8.0.11

Copyright (c) 2000, 2018, 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> show databases;

ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

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解決辦法

1、 修改使用者密碼

mysql> alter user 'root'@'localhost' identified by 'youpassword'; 

或者（下面這個只能修改當前登入的使用者密碼）      

mysql> set password=password("youpassword");

2、重新整理許可權

mysql> flush privileges;

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mysql> alter user 'root'@'localhost' identified by 'qA123,./';

Query OK, 0 rows affected (0.10 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| mysql              |

| performance_schema |

| sys                |

+--------------------+

4 rows in set (0.01 sec)

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[[email protected] ~]# systemctl restart mysqld.service

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常用的命令：

systemctl start mysqld    #啟動mysqld

systemctl stop mysqld    #停止mysqld

systemctl restart mysqld    #重啟mysqld

systemctl enable mysqld   #設定開機啟動

systemctl status mysqld    #檢視 MySQL Server 狀態