.yum安裝，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軟件包

yum check-update

3.更新系統

yum update

4.安裝mysql

yum install mysql mysql-server

*********************接下來是漫長的等待。如果中途關機，或者下載掛了，請執行卸載步驟后，再來一次。完成后記住要給root上密碼***********

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.啟動與開放遠程訪問

systemctl start mysqld

mysql -u root -p

6.授權遠程訪問

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.查看初始密碼

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

1.root登陸mysql

8.密碼強度低時報錯問題解決

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.數據庫啟動，停止，重啟

systemctl start mysqld

systemctl stop mysqld

service mysqld restart

10.修改max_allowed_packet

用VI打開/etc/my.cnf,增加下面一行,這句話是把上傳文件大小改到64M：

max_allowed_packet = 64M ???piwik建議

查看當前大小

show variables like '%max_allowed_packet%';

總結

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