1、删除centOS7默认安装的mariadb数据库
yum remove mariadb-libs.x86_64
2、下载Mysql源
https://dev.mysql.com/downloads/repo/yum/
wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
3.安装源
[root@localhost ~]# yum localinstall mysql57-community-release-el7-11.noarch.rpm
[root@localhost ~]# yum search mysql 查看源是否安装
4.安装MySQL
yum install mysql-community-server
查看mysql是否开；若没又开启用 service mysqld start
[root@localhost get]# netstat -luntp|grep mysqld
tcp6 0 0 :::3306 :::* LISTEN 1505/mysqld
[root@localhost 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
[root@localhost get]# lsof -i :3306
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
mysqld 1505 mysql 22u IPv6 20035 0t0 TCP *:mysql (LISTEN)
[root@localhost get]#
5.1找出默认密码
[root@localhost ~]# grep "password" /var/log/mysqld.log
2018-12-17T02:58:01.350311Z 1 [Note] A temporary password is generated for root@localhost: 0+bPX(WoFoJk
[root@localhost ~]#
登陆mysql
[root@localhost ~]#mysql -h127.0.0.1-uroot -p //-h后跟的是连接mysql服务器的ip
[root@localhost ~]# 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 不知道密码的情况下修改密码
1：vim /etc/my.cnf 添加 skip-grant-tables
2：重新启动 service mysqld restart
3：登录
[root@localhost ~]# 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 里skip-grant-tables注释掉
service mysqld restart
在mysql系统外，使用mysqladmin
# mysqladmin -u root -p password "test123"
Enter password: 【输入原来的密码】
6、访问出现问题
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql>
如果MySQL数据库用户的密码设置过于简单，数据库在用户登录后会提示重置密码，并且不接受简单的密码。
提示需要重置密码：
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
Mysql数据库版本：5.7.1
操作系统：CentOS 7
这个问题是否奇怪，因为明明是刚刚用密码登录了mysql服务器。怎么要重置密码呢？因为密码太简单了，不符合MySQL的安全要求。
参考官方的文档，见http://dev.mysql.com/doc/refman/5.6/en/alter-user.html。重置用户密码操作：
mysql> SET PASSWORD = PASSWORD('123456'); //123456 是重置的新密码
以上操作后又遇到新问题：
ERROR 1819 (HY000): Your password does NOT satisfy the CURRENT policy requirements。
又参考了官方文档，见http://dev.mysql.com/doc/refman/5.7/en/validate-password-plugin.html。
应该是密码过于简单了。 后来用大写字母+数字+特殊字符混合了一个密码。重置密码成功！
以后操作，没有再出现上述问题。
注意：如果只想设置简单密码需要修改两个全局参数：
mysql> set global validate_password_policy=0;
mysql> set global validate_password_length=1;
查看数据库：
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.00 sec)
7、开启Genelog
Genelog 记录了所有操作的mysql语句
设置日志存放目录
mysql> set global general_log_file="/tmp/general.log";
Query OK, 0 rows affected (0.00 sec)
开启genelog
mysql> set global general_log=on;
Query OK, 0 rows affected (0.00 sec)
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作者：LIU_BING_ONE
来源：CSDN
原文：https://blog.csdn.net/LINU_BW/article/details/85046122
版权声明：本文为博主原创文章，转载请附上博文链接！