max 安装 mysql5.x_MySQL5.7安装

.yum安装，先要搞到源

wget http://repo.mysql.com/mysql57-community-release-el7-9.noarch.rpm

sudo rpm -ivh mysql57-community-release-el7-9.noarch.rpm

2.更新yum软件包

yum check-update

3.更新系统

yum update

4.安装mysql

yum install mysql mysql-server

*********************接下来是漫长的等待。如果中途关机，或者下载挂了，请执行卸载步骤后，再来一次。完成后记住要给root上密码***********

systemctl start mysqld

mysql -u root

mysql> update mysql.user set authentication_string=password('admin') where user='root' and Host ='localhost';

mysql> flush privileges;

mysql> quit;

5.启动与开放远程访问

systemctl start mysqld

mysql -u root -p

6.授权远程访问

use mysql;

grant all privileges  on *.* to root@'%' identified by "admin";

grant all privileges  on *.* to piwik@'%' identified by "ph20190420";

FLUSH PRIVILEGES;

create user user@'%' identified by 'admin'

7.查看初始密码

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

1.root登陆mysql

8.密码强度低时报错问题解决

mysql> set global validate_password_policy=0;

mysql> set global validate_password_mixed_case_count=0;

mysql> set global validate_password_number_count=3;

mysql> set global validate_password_special_char_count=0;

mysql> set global validate_password_length=3;

alter user root@localhost identified by 'admin';

9.数据库启动，停止，重启

systemctl start mysqld

systemctl stop mysqld

service mysqld restart

10.修改max_allowed_packet

用VI打开/etc/my.cnf,增加下面一行,这句话是把上传文件大小改到64M：

max_allowed_packet = 64M    piwik建议

查看当前大小

show variables like '%max_allowed_packet%';

总结

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