1，创建目录

在安装mysql的目录下创建一个文件夹

mkdir mysql
cd mysql

2，下载 Mysql Yum

wget http://repo.mysql.com/mysql57-community-release-el7-8.noarch.rpm

安装 Yum

rpm -ivh mysql57-community-release-el7-8.noarch.rpm

3，安装 Mysql

yum install mysql-server

4，4， 运行 Mysql

service mysqld start

5，获取初始密码

grep "password" /var/log/mysqld.log
#### 下面是返回的内容，密码也末尾
2019-04-16T08:49:16.906290Z 1 [Note] A temporary password is generated for root@localhost: w*3tUglUo=p:

6，修改密码

### 使用临时密码登陆
mysql -u root -p

### 由于 5.7 处于安全考虑，不让设置简单密码，要先更改其密码机制
set global validate_password_policy=LOW;
### 设置密码长度
set global validate_password_length=6;
### 修改密码
SET PASSWORD = PASSWORD('111111');
ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;
flush privileges;

7，远程和本地访问

use mysql;
update user set host = '%' where user = 'root';
### 使配置生效
flush privileges;

8，设置字符集

### 登陆数据库后
set character_set_database=utf8;
flush privileges;

9，一些文件的存放目录

### 配置文件
/etc/my.cnf
### 数据库文件目录
/var/lib/mysql
### 日志记录文件
/var/log/ mysqld.log
### 服务启动脚本
/usr/lib/systemd/system/mysqld.service
### socket文件
/var/run/mysqld/mysqld.pid

作者：[唯爱米]

my.cnf 配置

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[mysqld]

#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[client]
default-character-set=utf8
[mysqld]
character-set-server=utf8