CentOS 7 安装 mysql-5.7

1.安装 wget 命令

 yum -y install wget

2.下载mysql源码包

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

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

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

3.修改安装mysql包版本

vi /etc/yum.repos.d/mysql-community.repo

改变默认安装的mysql版本。比如要安装5.6版本，将5.7源的enabled=1改成enabled=0。然后再将5.6源的enabled=0改成enabled=1即可

4.安装mysql

yum install mysql-community-server

5.启动mysql

systemctl start mysqld

6.查看mysql启动状态

systemctl status mysqld

7.查看mysql版本

mysqld --version

8.设置开机启动

systemctl enable mysqld

systemctl daemon-reload

9.找到安装时设置的默认密码

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

密码日志 : 2018-12-03T14:54:06.651986Z 1 [Note] A temporary password is generated for root@localhost: o9kWqD?i6<SU

密码:o9kWqD?i6<SU

10.输入密码进入mysql命令行

mysql -uroot -p

​ 回车输入 步骤 9 中的密码，进入mysql命令行

11.进入mysql命令行后修改密码

ALTER USER 'root'@'localhost' IDENTIFIED BY '1234!1234Labcd'; 

修改后 root 用户密码为 '1234!1234Labcd'

12.刷新权限

FLUSH PRIVILEGES;

13.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'

14.重启mysql

 shell> systemctl restart mysqld 

15.进入mysql命令行查看编码 (使用 mysql -uroot -p 进入mysql命令行)

show variables like '%character%';

16.添加远程登陆用户

GRANT ALL PRIVILEGES ON *.* TO 'setsuna'@'%' IDENTIFIED BY 'Setsuna_Pisces313!' WITH   GRANT OPTION;

'setsuna'@'%' 中'@'%写死的暂时不用管它， 远程用户名为: setsuna 密码为: Setsuna_Pisces313!

17.默认配置文件路径(请根据需求自行修改)

默认配置文件路径： 
配置文件：/etc/my.cnf 
日志文件：/var/log//var/log/mysqld.log 
服务启动脚本：/usr/lib/systemd/system/mysqld.service 
socket文件：/var/run/mysqld/mysqld.pid
查看安装目录: show variables like "%char%";

18.设置防火墙

firewall-cmd --zone=public --add-port=3306/tcp --permanent

重启防火墙
firewall-cmd --reload 

查看防火墙状态
firewall-cmd --state