CentOS7下安装MySQL5.7安装与配置（YUM）

# 下载mysql源安装包

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

# 安装mysql源

yum localinstall mysql57-community-release-el7-8.noarch.rpm

检查mysql源是否安装成功

yum repolist enabled | grep "mysql.*-community.*"

看到上图所示表示安装成功。 

安装MySQL

yum install mysql-community-server

启动MySQL服务

systemctl start mysqld

查看MySQL的启动状态

shell> systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; disabled; vendor preset: disabled)
Active: active (running) since 五 2016-06-24 04:37:37 CST; 35min ago
Main PID: 2888 (mysqld)
CGroup: /system.slice/mysqld.service
└─2888 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

6月 24 04:37:36 localhost.localdomain systemd[1]: Starting MySQL Server...
6月 24 04:37:37 localhost.localdomain systemd[1]: Started MySQL Server.

开机启动

systemctl enable mysqld

systemctl daemon-reload

修改root本地登录密码

mysql安装完成之后，在/var/log/mysqld.log文件中给root生成了一个默认密码。通过下面的方式找到root默认密码，然后登录mysql进行修改：

shell> grep 'temporary password' /var/log/mysqld.log

shell> mysql -uroot -p

shell> mysql -uroot -p mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

注意：mysql5.7默认安装了密码安全检查插件（validate_password），默认密码检查策略要求密码必须包含：大小写字母、数字和特殊符号，并且长度不能少于8位。否则会提示ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

添加远程登录用户

默认只允许root帐户在本地登录，如果要在其它机器上连接mysql，必须修改root允许远程连接，或者添加一个允许远程连接的帐户，为了安全起见，我添加一个新的帐户：

mysql> GRANT ALL PRIVILEGES ON *.* TO 'yangxin'@'%' IDENTIFIED BY 'Yangxin0917!' WITH GRANT OPTION;

配置默认编码为utf8

修改/etc/my.cnf配置文件，在[mysqld]下添加编码配置，如下所示：

[mysqld]

character_set_server=utf8

init_connect='SET NAMES utf8'

摘抄处：https://blog.csdn.net/xyang81/article/details/51759200