CentOS 6/7 安装 MySQL 8 最新版

相关链接：

检查是否安装了wget：

[root@CentOS-x86-64-DVD-1804-Desktop ~]# wget -V

如果没有安装wget，执行下列命令安装：

[root@CentOS-x86-64-DVD-1804-Desktop ~]# yum -y install wget

下载MySQL 8 rmp源：
MySQL rpm源：http://repo.mysql.com/
MySQL 8 适用于 CentOS 6 rpm源：http://repo.mysql.com/mysql80-community-release-el6.rpm
MySQL 8 适用于 CentOS 7 rpm源：http://repo.mysql.com/mysql80-community-release-el7.rpm
本文以 CentOS 7 为例安装 MySQL 8：
下载 MySQL 8 rpm源：
```
[root@CentOS-x86-64-DVD-1804-Desktop ~]# wget http://repo.mysql.com/mysql80-community-release-el7.rpm
```
默认下载位置为用户当前所在位置。

安装 MySQL 8 rpm源：

[root@CentOS-x86-64-DVD-1804-Desktop ~]# yum -y localinstall mysql80-community-release-el7.rpm

安装 MySQL 8 数据库：

[root@CentOS-x86-64-DVD-1804-Desktop ~]# yum -y install mysql-community-server

启动MySQL数据库：

[root@CentOS-x86-64-DVD-1804-Desktop ~]# systemctl start mysqld

开启MySQL的开机自启：

[root@CentOS-x86-64-DVD-1804-Desktop ~]# systemctl enable mysqld

重新载入：

[root@CentOS-x86-64-DVD-1804-Desktop ~]# systemctl daemon-reload

查看MySQL预设密码：
使用命令（优先选择）：

[root@CSDNBlogs doc]# grep 'temporary password' /var/log/mysqld.log
2018-10-19T16:43:18.727456Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: ZWHc%Wg7a!s6

或者使用：

[root@CentOS-x86-64-DVD-1804-Desktop ~]# less /var/log/mysqld.log

预设密码在root@localhost后面：

2018-10-19T16:43:17.265505Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.12) initializing of server in progress as process 2745
2018-10-19T16:43:18.727456Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: ZWHc%Wg7a!s6
2018-10-19T16:43:19.892087Z 0 [System] [MY-013170] [Server] /usr/sbin/mysqld (mysqld 8.0.12) initializing of server has completed
2018-10-19T16:43:22.241433Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.12) starting as process 2794
2018-10-19T16:43:26.751129Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2018-10-19T16:43:26.893648Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.12'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server - GPL.

登录MySQL数据库（密码在上一步可查看）：

[root@CentOS-x86-64-DVD-1804-Desktop ~]# mysql -u root -p 
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 8.0.12

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>

初次登录，修改数据库密码：

mysql> ALTER user 'root'@'localhost' IDENTIFIED BY 'Aaa+Bbb-123';
Query OK, 0 rows affected (0.02 sec)

CentOS 6/7 安装 MySQL 8 最新版

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