转自：https://yq.aliyun.com/articles/285398

使用root登录

1.确保服务器系统处于最新状态
[root@localhost ~]# yum -y update
如果显示以下内容说明已经更新完成
Replaced:
grub2.x86_64 1:2.02-0.64.el7.centos grub2-tools.x86_64 1:2.02-0.64.el7.centos
Complete!

2.重启服务器
[root@localhost ~]# reboot

3.首先检查是否已经安装，如果已经安装先删除以前版本，以免安装不成功
[root@localhost ~]# php -v
或
[root@localhost ~]# rpm -qa | gerp mysql
或
[root@localhost ~]# yum list installed | grep mysql

如果显示以下内容说明没有安装服务
-bash: gerp: command not found

4.下载MySql安装包
[root@localhost ~]# rpm -ivh http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
或
[root@localhost ~]# rpm -ivh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm

5.安装MySql
[root@localhost ~]# yum install -y mysql-server
或
[root@localhost ~]# yum install mysql-community-server
如果显示以下内容说明安装成功
Complete!

6.设置开机启动Mysql
[root@localhost ~]# systemctl enable mysqld.service

7.检查是否已经安装了开机自动启动
[root@localhost ~]# systemctl list-unit-files | grep mysqld
如果显示以下内容说明已经完成自动启动安***r>mysqld.service enabled

8.设置开启服务
[root@localhost ~]# systemctl start mysqld.service

9.查看MySql默认密码
[root@localhost ~]# grep 'temporary password' /var/log/mysqld.log

10.登陆MySql，输入用户名和密码
[root@localhost ~]# mysql -uroot -p

11.修改当前用户密码
mysql>SET PASSWORD = PASSWORD('Abc123!_');

12.开启远程登录，授权root远程登录
mysql>GRANT ALL PRIVILEGES ON . TO 'root'@'%' IDENTIFIED BY 'a123456!' WITH GRANT OPTION;

13.命令立即执行生效
mysql>flush privileges;

其他功能:

检查并且显示Apache相关安装包

[root@localhost ~]# rpm -qa | grep mysql

删除MySql

[root@localhost ~]# yum remove -y mysql mysql mysql-server mysql-libs compat-mysql51
或
[root@localhost ~]# rpm -e mysql-community-libs-5.7.20-1.el7.x86_64 --nodeps
或
[root@localhost ~]# yum -y remove mysql-community-libs-5.7.20-1.el7.x86_64

查看MySql相关文件

[root@localhost ~]# find / -name mysql

重启MySql服务

[root@localhost ~]# service mysqld restart

查看MySql版本

[root@localhost ~]# yum repolist all | grep mysql

查看当前的启动的 MySQL 版本

[root@localhost ~]# yum repolist enabled | grep mysql

通过Yum来安装MySQL,会自动处理MySQL与其他组件的依赖关系

[root@localhost ~]# yum install mysql-community-server

查看MySQL安装目录

[root@localhost ~]# whereis mysql

启动MySQL服务

[root@localhost ~]# systemctl start mysqld

查看MySQL服务状态

[root@localhost ~]# systemctl status mysqld

关闭MySQL服务

[root@localhost ~]# systemctl stop mysqld

测试MySQL是否安装成功

[root@localhost ~]# mysql

查看MySql默认密码

[root@localhost ~]# grep 'temporary password' /var/log/mysqld.log

查看所有数据库

mysql>show databases;

退出登录数据库

mysql>exit;

查看所有数据库用户

mysql>SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user;