1、刪除centOS7預設安裝的mariadb資料庫

  yum remove mariadb-libs.x86_64

2、下載Mysql源

  https://dev.mysql.com/downloads/repo/yum/

wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm

3.安裝源

[[email protected] ~]# yum localinstall mysql57-community-release-el7-11.noarch.rpm

[[email protected] ~]# yum search mysql 檢視源是否安裝

4.安裝MySQL

 yum install mysql-community-server

檢視mysql是否開；若沒又開啟用 service mysqld start

[[email protected] get]# netstat -luntp|grep mysqld
tcp6       0      0 :::3306                 :::*                    LISTEN      1505/mysqld
[

[email protected] get]# ps -ef|grep mysql
mysql     1505     1  1 21:58 ?        00:00:00 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid
root      1537  1258  0 21:58 pts/0    00:00:00 grep --color=auto mysql

[[email protected] get]# lsof -i :3306
COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
mysqld  1505 mysql   22u  IPv6  20035      0t0  TCP *:mysql (LISTEN)
[[email protected] get]#

5.1找出預設密碼

[[email protected] ~]# grep "password" /var/log/mysqld.log
2018-12-17T02:58:01.350311Z 1 [Note] A temporary password is generated for [email protected]: 0+bPX(WoFoJk
[[email protected] ~]#

登陸mysql

[[email protected] ~]#mysql -h127.0.0.1-uroot -p //-h後跟的是連線mysql伺服器的ip

[[email protected] ~]# mysql  -uroot -p0+bPX\(WoFoJk

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.7.21

5.2 不知道密碼的情況下修改密碼

1：vim /etc/my.cnf 新增 skip-grant-tables

2：重新啟動  service mysqld restart

3：登入

[[email protected] ~]# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.24 MySQL Community Server (GPL)

mysql> use mysql;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> update user set authentication_string=password('456789') where user='root';

Query OK, 1 row affected, 1 warning (0.01 sec)

Rows matched: 1  Changed: 1  Warnings: 1

mysql> flush privileges;

mysql> eixt;

把/etc/my,cnf 裡skip-grant-tables註釋掉

service mysqld restart

在mysql系統外，使用mysqladmin
# mysqladmin -u root -p password "test123"
Enter password: 【輸入原來的密碼】

6、訪問出現問題

mysql> show databases;

ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

mysql>

如果MySQL資料庫使用者的密碼設定過於簡單，資料庫在使用者登入後會提示重置密碼，並且不接受簡單的密碼。
提示需要重置密碼：
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
Mysql資料庫版本：5.7.1
作業系統：CentOS 7
這個問題是否奇怪，因為明明是剛剛用密碼登入了mysql伺服器。怎麼要重置密碼呢？因為密碼太簡單了，不符合MySQL的安全要求。
參考官方的文件，見http://dev.mysql.com/doc/refman/5.6/en/alter-user.html。重置使用者密碼操作：
mysql> SET PASSWORD = PASSWORD('123456');   //123456 是重置的新密碼
以上操作後又遇到新問題：
ERROR 1819 (HY000): Your password does NOT satisfy the CURRENT policy requirements。
又參考了官方文件，見http://dev.mysql.com/doc/refman/5.7/en/validate-password-plugin.html。
應該是密碼過於簡單了。 後來用大寫字母+數字+特殊字元混合了一個密碼。重置密碼成功！
以後操作，沒有再出現上述問題。
注意：如果只想設定簡單密碼需要修改兩個全域性引數：
mysql> set global validate_password_policy=0;
mysql> set global validate_password_length=1;

檢視資料庫： 

mysql> show databases;

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

| Database           |

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

| information_schema |

| mysql              |

| performance_schema |

| sys                |

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

4 rows in set (0.00 sec)

7、開啟Genelog

 Genelog 記錄了所有操作的mysql語句

設定日誌存放目錄

mysql> set global general_log_file="/tmp/general.log";

Query OK, 0 rows affected (0.00 sec)

開啟genelog

mysql> set global general_log=on;

Query OK, 0 rows affected (0.00 sec)
--------------------- 
作者：LIU_BING_ONE 
來源：CSDN 
原文：https://blog.csdn.net/LINU_BW/article/details/85046122 
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