Mysql修改密码以及权限问题

mysql修改密码小步骤

错误分析：

一开始是密码错误导致，先添加skip-grant-tables（这个配置无视权限的，添加直接回车登录即可），尽心修改密码，发现错误照旧

百度了一下，发现是mysql数据权限问题

因为mysql数据库的user表里，存在用户名为空的账户即匿名账户，导致登录的时候 是虽然用的是root，

但实际是匿名登录的，通过错误提示里的''@'localhost'可以看出来

---

Centos 7 系统为例：

在 [mysqld] 添加 skip-grant-tables

[root@centos001 install]# vim /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html

[mysqld]
skip-grant-tables
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

---

重启命令：service mysqld restart 重启Mysql服务

mysql -uroot -p 回车即可

[root@centos001 install]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.6.36 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

---

修改密码：

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> show tables;
+---------------------------+
| Tables_in_mysql           |
+---------------------------+
| columns_priv              |
| db                        |
| event                     |
| func                      |
| general_log               |
| help_category             |
| help_keyword              |
| help_relation             |
| help_topic                |
| innodb_index_stats        |
| innodb_table_stats        |
| ndb_binlog_index          |
| plugin                    |
| proc                      |
| procs_priv                |
| proxies_priv              |
| servers                   |
| slave_master_info         |
| slave_relay_log_info      |
| slave_worker_info         |
| slow_log                  |
| tables_priv               |
| time_zone                 |
| time_zone_leap_second     |
| time_zone_name            |
| time_zone_transition      |
| time_zone_transition_type |
| user                      |
+---------------------------+
28 rows in set (0.00 sec)

mysql> UPDATE user SET password=PASSWORD('badaokeji') WHERE user='root';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 5  Changed: 0  Warnings: 0

修改密码成功！
刷新数据裤：
FLUSH PRIVILEGES;

---

登录Mysql

删除我mysql的skip-grant-tables配置

[root@centos001 install]# vim /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html

[mysqld]
skip-grant-tables
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

重启mysql：
service mysqld restart

mysql -uroot -pbadaokeji
登录成功！！

---

---

---

---

登录mysql发现错误：
        ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
        密码正确还是无法登录

mysql数据权限问题

[root@centos001 install]# mysql -uroot -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
[root@centos001 install]# 

那么就是我们的Mysql数据库问题
我们继续在/etc/my.con添加：
    [mysqld]
    skip-grant-tables

重启mysql：
    service mysqld restart

---

重新登陆Mysql

[root@centos001 ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.6.36 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
+--------------------+
1 row in set (0.00 sec)

mysql> exit;

百度了一下，发现是mysql数据权限问题
因为mysql数据库的user表里，存在用户名为空的账户即匿名账户，导致登录的时候 是虽然用的是root，
但实际是匿名登录的，通过错误提示里的''@'localhost'可以看出来

---

修改Mysql权限

添加无视权限配置： /etc/my.cof
        [root@centos001 ~]# vim /etc/my.cnf
        # For advice on how to change settings please see
        # http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html

        [mysqld]
        skip-grant-table
        datadir=/var/lib/mysql
        socket=/var/lib/mysql/mysql.sock

登录Mysql：
    [root@centos001 ~]# mysql -uroot -p
    Enter password:
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 2
    Server version: 5.6.36 MySQL Community Server (GPL)

    Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.

    Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

    mysql> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | ambari             |
    | mysql              |
    | performance_schema |
    +--------------------+
    4 rows in set (0.00 sec)

    mysql> use msyq;
    ERROR 1049 (42000): Unknown database 'msyq'
    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 change
    mysql> delete from user where USER='';
    Query OK, 2 rows affected (0.00 sec)

    mysql> flush privileges;
    Query OK, 0 rows affected (0.00 sec)

    mysql> \q
    Bye

删除 skip-grant-table 配置
[root@centos001 ~]# vim /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

重启Mysql
[root@centos001 ~]# service mysqld restart
Redirecting to /bin/systemctl restart  mysqld.service
[root@centos001 ~]# 

重新登录Mysql：
    root@centos001 ~]# mysql -uroot -p
    Enter password:
    ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
    [root@centos001 ~]# mysql -uroot -p
    Enter password:
    [root@centos001 ~]# mysql -uroot -p
    Enter password:
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 5
    Server version: 5.6.36 MySQL Community Server (GPL)

    Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.

    Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

    mysql> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | ambari             |
    | mysql              |
    | performance_schema |
    +--------------------+
    4 rows in set (0.00 sec)

    mysql>