mysql 5.7-22

用rpm方式安装下载rpm包 yum安装

wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

yum -y install mysql57-community-release-el7-10.noarch.rpm

yum -y install mysql-community-server

开启数据库

systemctl start mysqld.service

systemctl status mysqld.service

systemctl enable mysqld.service

由于5.7.22把密码放到了初始化里面，要查看一下随机密码才可以

查看密码

grep "password" /var/log/mysqld.log

进入数据库后初始化密码，要不无法操作

更改密码

alter user 'root'@'localhost' identified by '#20as3SElksds0ew98';

刷新

flush privileges;

查看数据库

show databases;

进入数据库授权

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '#20as3SElksds0ew98';

刷新权限

FLUSH PRIVILEGES;

更改密码长度和策略

mysql> set global validate_password_policy=0;

Query OK, 0 rows affected (0.00 sec)

mysql> set global validate_password_length=0;

Query OK, 0 rows affected (0.00 sec)

mysql> alter user 'root'@'localhost' identified by '123456';

Query OK, 0 rows affected (0.00 sec)

在此注意如果更改了目录需要改一下selinux的警报模式，默认要关闭，否则你重启服务器的时候mysql是不会启动的。

更改存储目录

这里更改mysql的目录要看具体情况，我的存储盘在/home下就写到了/home/data。

mkdir /home/data/

复制

cp -R /var/lib/mysql /home/data/

授予mysql用户权限

chown -R mysql:mysql /home/data/mysql

修改配置文件/etc/my.cnf

datadir=/home/data/mysql

重启mysql

systemctl restart mysqld

查看mysql的存储目录，需要进入MySQL里面

mysql> show variables like '%datadir%';

+---------------+-------------------+

| Variable_name | Value |

+---------------+-------------------+

| datadir | /home/data/mysql/ |

+---------------+-------------------+

1 row in set (0.00 sec)

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