第一步、下载MySQL 安装包：
[root@localhost local]# wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
安装mysql 安装源：
[root@localhost local]# yum -y localinstall mysql57-community-release-el7-11.noarch.rpm
第二步，在线安装MySQL
[root@localhost local]# yum -y install mysql-community-server
等待时间比较久 note:如果这里发生错误centos7.8安装mysql5.7时Error: Unable to find a match: mysql-community-server
解决：
先执行：yum module disable mysql
再执行：yum -y install mysql-community-server
第三步、启动mysql 服务
[root@localhost local]# systemctl start mysqld
第四步，设置开机启动
[root@localhost local]# systemctl enable mysqld
[root@localhost local]# systemctl daemon-reload
第五步，修改root登录密码
mysql安装完成之后，会在/var/log/mysqld.log文件中给root生成了一个临时的默认密码。
[root@localhost local]# vim /var/log/mysqld.log
image.png
记住初始密码：
修改root 密码
[root@localhost local]# mysql -u root -p
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'daasan7ujm^YHN';
Query OK, 0 rows affected (0.00 sec)
# 设置远程登录
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'daasan7ujm^YHN' WITH GRANT OPTION;
Query OK, 0 rows affected, 1 warning (0.00 sec)
第六步，退出
mysql> exit
第七步，防火墙开放3306端口
自行百度
第八步，重启防火墙。
[root@localhost sysconfig]# service iptables restart
第九步，配置mysql默认编码为utf-8
[root@localhost sysconfig]# vim /etc/my.cnf
添加如下代码
character_set_server=utf8
init_connect='SET NAMES utf8'
:wq 保存退出
第十步，重启MySQL
[root@localhost data]# systemctl restart mysqld
第十一步， root 用户登录查看编码
[root@localhost sysconfig]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.29 MySQL Community Server (GPL)
Copyright (c) 2000, 2020, 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 variables like '%character%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)
done!
