【MySQL】Linux下安装MySQL、并创建MySQL用户

1、安装MySQL

下载MySQL安装包，并上传到Linux服务器上

mysql-5.7.26-linux-glibc2.12-x86_64.tar.gz

解压

[root@localhost tmp]# tar -xzvf  mysql-5.7.26-linux-glibc2.12-x86_64.tar.gz -C /usr/local/

修改目录

[root@localhost ~]# mv /usr/local/mysql-5.7.26-linux-glibc2.12-x86_64/ /usr/local/mysql

创建用户和组

[root@localhost ~]# groupadd mysql
[root@localhost ~]# useradd -r -g mysql mysql

更改目录所有者及所属组

[root@localhost ~]# chown -R mysql.mysql /usr/local/mysql

创建data目录

[root@localhost mysql]# mkdir data

安装依赖包

[root@localhost mysql]# yum install libaio

进行初始化

[root@localhost mysql]# /usr/local/mysql/bin/mysqld --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data --initialize

修改配置

[root@localhost mysql]# vim /etc/my.cnf

[mysqld]
datadir=/usr/local/mysql/data
basedir=/usr/local/mysql
socket=/tmp/mysql.sock
user=mysql
port=3306
character-set-server=utf8
# 取消密码验证
skip-grant-tables
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# skip-grant-tables
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

将MySQL加入到服务中

[root@localhost mysql]# cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql

开机启动

[root@localhost mysql]# chkconfig mysql on

启动MySQL服务

[root@localhost mysql]# service mysql start

登陆MySQL，在配置文件/etc/my.cnf中跳过密码登陆，所以可以免密登陆

[root@localhost mysql]# /usr/local/mysql/bin/mysql -uroot -p

2、创建MySQL用户

查看用户

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

查看数据库

mysql> show databases;

登录MySQL后，由于配置免密登录，刷新权限后即可重新设置密码

mysql> flush privileges;

更改root密码

mysql> set password for root@localhost=password('123456');

创建用户

mysql> CREATE USER 'tfdb'@'localhost' IDENTIFIED BY '123456';

赋予所有权限

mysql> GRANT ALL PRIVILEGES ON *.* TO "tfdb"@"%" IDENTIFIED BY "123456" WITH GRANT OPTION;

如果flush privileges;刷新权限后退出了MySQL，再次登录的时候会提示失败，需要重启MySQL服务

[root@localhost mysql]# service mysql start