CentOS7安裝MySQL以及密碼修改

wget -i -c

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

yum -y install mysql-community-server

至此mysql就安裝完成了，然後是對mysql的一些設定。

[root@localhost ~]# systemctl start  mysqld.service

此時mysql已經開始正常執行，不過要想進入mysql還得先找出此時root使用者的密碼，通過如下命令可以在日誌檔案中找出密碼：

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

如下命令進入資料庫：

mysql -u root -p

mysql> alter user 'root'@'localhost' identified by 'new password';

image

原因是因為mysql有密碼設定的規範，具體是與validate_password_policy的值有關：

mysql完整的初始密碼規則可以通過如下命令檢視：

密碼的長度是由validate_password_length決定的，而validate_password_length的計算公式是：

validate_password_length = validate_password_number_count +validate_password_special_char_count + (2* validate_password_mixed_case_count)

mysql> set global validate_password_policy=0;

mysql> set global validate_password_length=1;

但此時還有乙個問題，就是因為安裝了yum repository，以後每次yum操作都會自動更新，需要把這個解除安裝掉：

[root@localhost ~]#yum -y remove mysql57-community-release-el7-10.noarch

mysql -u root -p

mysql>use mysql;
mysql>select 'host' from user where user='root';
mysql>update user set host = '%' where user ='root';
mysql>flush privileges;
mysql>select 'host' from user where user='root';

第二句：選擇mysql庫

第三句：檢視mysql庫中的user表的host值（即可進行連線訪問的主機/ip名稱）

第六句：再重新檢視user表時，有修改。。

重起mysql服務即可完成。

開啟mysql配置檔案vi /etc/mysql/mysql.conf.d/mysqld.cnf

將bind-address = 127.0.0.1登出​

bind-address = 0.0.0.0 # 表示允許任何主機登陸mysql
port=3306 # 表示mysql執行埠為3306

grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;

flush privileges;
/etc/init.d/mysql start

mysql5.6

grant all privileges on *.* to root@'%' identified by "mysql_pwd" with grant option;
grant all privileges on *.* to root@'localhost' identified by "mysql_pwd" with grant option;
grant all privileges on *.* to root@'127.0.0.1' identified by "mysql_pwd" with grant option;
drop database if exists test;
use mysql;
delete from user where not (user='root');
delete from db where user='';
update user set password=password('mysql_pwd') where user='root' and host='127.0.0.1' or host='%' or host='localhost';
delete from user where password='';
flush privileges;
select user,password,host from mysql.user;
exit;
mysql5.7:
grant all privileges on *.* to root@'%' identified by "mysql_pwd" with grant option;
grant all privileges on *.* to root@'localhost' identified by "mysql_pwd" with grant option;
grant all privileges on *.* to root@'127.0.0.1' identified by "mysql_pwd" with grant option;
drop database if exists test;
use mysql;
delete from user where not (user='root');
delete from db where user='';
delete from user where authentication_string='';
update mysql.user set authentication_string=password('mysql_pwd') where user='root' and host='127.0.0.1' or host='%' or host='localhost';
flush privileges;
select user,authentication_string,host from mysql.user;
exit;

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