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 程式師世界 >> 數據庫知識 >> MYSQL數據庫 >> MySQL綜合教程 >> 淺談mysql密碼遺忘和登陸報錯的問題

淺談mysql密碼遺忘和登陸報錯的問題

編輯:MySQL綜合教程

淺談mysql密碼遺忘和登陸報錯的問題。本站提示廣大學習愛好者:(淺談mysql密碼遺忘和登陸報錯的問題)文章只能為提供參考,不一定能成為您想要的結果。以下是淺談mysql密碼遺忘和登陸報錯的問題正文


mysql登錄密碼忘記,其實解決辦法很簡單,只需要在mysql的主配置文件my.cnf裡添加一行“跳過授權表”的參數選擇即可!

在my.cnf中添加下面一行:

[root@test-huanqiu ~]# vim /etc/my.cnf              //在[mysqld]區域裡添加
........
skip-grant-tables                       //跳過授權表

然後重啟mysql服務,即可無密碼登錄

[root@test-huanqiu ~]# /etc/init.d/mysqld restart

登錄後重置密碼

[root@test-huanqiu ~]# mysql
mysql> select host,user,password from mysql.user;
+--------------------+------+-------------------------------------------+
| host | user | password |
+--------------------+------+-------------------------------------------+
| localhost | root | *481ACA1BD6D1E86221244904E9C0FABA33B40B84 |
| host-192-168-1-117 | root | |
| 127.0.0.1 | root | |
| ::1 | root | |
| localhost | | |
| host-192-168-1-117 | | |
+--------------------+------+-------------------------------------------+
6 rows in set (0.00 sec)

mysql> update mysql.user set password=password("123456") where host="localhost" and user="root";
Query OK, 1 row affected (0.02 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

mysql> select host,user,password from mysql.user;
+--------------------+------+-------------------------------------------+
| host | user | password |
+--------------------+------+-------------------------------------------+
| localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
| host-192-168-1-117 | root | |
| 127.0.0.1 | root | |
| ::1 | root | |
| localhost | | |
| host-192-168-1-117 | | |
+--------------------+------+-------------------------------------------+
6 rows in set (0.00 sec)

mysql>

再次將my.cnf裡添加的那一行注釋,然後重啟mysql

[root@test-huanqiu ~]# vim /etc/my.cnf
........
#skip-grant-tables

[root@test-huanqiu ~]# /etc/init.d/mysqld restart

[root@test-huanqiu ~]# mysql -p123456
mysql>

-----------------------------------------------------------------------------------------------------------------------

發現的一個坑:

mysql之前進行了全量備份,在恢復後,發現用之前的密碼登陸不進去了!
使用上面的方法,無密碼登陸後再重置密碼,但是重置密碼後發現仍然登陸不進去。

最後發現是因為mysql.user表內容被清空了!
mysql> select host,user,password from user;
Empty set (0.00 sec)

解決:

插入數據,再重置密碼

mysql> insert into user(host,user,password) values("localhost","root","123456");
Query OK, 1 row affected, 3 warnings (0.01 sec)

mysql> select host,user,password from user;
+-----------+------+----------+
| host | user | password |
+-----------+------+----------+
| localhost | root | 123456 |
+-----------+------+----------+
1 row in set (0.00 sec)

mysql> update mysql.user set password=password("123456") where host="localhost" and user="root";
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> select host,user,password from user;
+-----------+------+-------------------------------------------+
| host | user | password |
+-----------+------+-------------------------------------------+
| localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
+-----------+------+-------------------------------------------+
1 row in set (0.00 sec)
mysql> insert into user(host,user,password) values("127.0.0.1","root","123456");
Query OK, 1 row affected, 3 warnings (0.00 sec)

mysql> select host,user,password from user;
+-----------+------+-------------------------------------------+
| host | user | password |
+-----------+------+-------------------------------------------+
| localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
| 127.0.0.1 | root | 123456 |
+-----------+------+-------------------------------------------+
2 rows in set (0.00 sec)

mysql> update mysql.user set password=password("123456") where user="root";
Query OK, 1 row affected (0.00 sec)
Rows matched: 2 Changed: 1 Warnings: 0

mysql> select host,user,password from user;
+-----------+------+-------------------------------------------+
| host | user | password |
+-----------+------+-------------------------------------------+
| localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
| 127.0.0.1 | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
+-----------+------+-------------------------------------------+

然後使用重置後的密碼就能正常登陸了!

------------------------------------------------------------------------------------------------------------------

mysql登錄報錯1:

[root@test-huanqiu ~]# mysql -p123456
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)

[root@test-huanqiu ~]# ps -ef|grep mysql
root 28279 1 0 12:55 ? 00:00:00 /bin/sh /usr/local/mysql//bin/mysqld_safe --datadir=/data/mysql/data --pid-file=/data/mysql/data/mysql.pid
mysql 29059 28279 0 12:55 ? 00:00:01 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql/ --datadir=/data/mysql/data --plugin-dir=/usr/local/mysql//lib/plugin --user=mysql --log-error=/data/mysql/data/mysql-error.log --pid-file=/data/mysql/data/mysql.pid --socket=/usr/local/mysql/var/mysql.sock --port=3306
root 30726 11268 0 12:58 pts/2 00:00:00 grep mysql

可知,當前mysql.sock文件路徑是/usr/local/mysql/var/mysql.sock,

解決辦法:做軟鏈接

[root@test-huanqiu ~]# ll /usr/local/mysql/var/mysql.sock
rwxrwxrwx. 1 mysql mysql 0 Nov 29 12:55 /usr/local/mysql/var/mysql.sock
[root@test-huanqiu ~]# rm -f /var/lib/mysql/mysql.sock
[root@test-huanqiu ~]# ln -s /usr/local/mysql/var/mysql.sock /var/lib/mysql/mysql.sock

這樣就沒問題了

[root@test-huanqiu ~]# mysql -p123456
mysql>

----------------------------------------------------------------------------------------------------

啟動mysql的時候報錯:

Starting MySQL.... ERROR! The server quit without updating PID file (/data/mysql/data/mysql.pid).

嘗試的解決辦法:

(1)權限問題

可能是mysql.pid文件沒有寫的權限,將mysql的安裝目錄和數據目錄的權限都設置成mysql啟動用戶權限。比如都修改為mysql:mysql權限

(2)可能進程裡已經存在mysql進程

ps -ef|grep mysql 查出要是有mysql進程存在,就kill掉,再嘗試重啟mysql

(3)可能是多次在機器上安裝mysql,有殘余數據影響了服務的啟動。

去mysql的數據目錄看看,如果存在mysql-bin.index,就立刻刪掉它,它就是罪魁禍首了!

(4)mysql在啟動時沒有指定配置文件時會使用/etc/my.cnf配置文件,請打開這個文件查看在[mysqld]節下有沒有指定數據目錄。

在[mysqld]下添加設置,如datadir = /data/mysql/data

(5)skip-federated字段問題

檢查一下my.cnf文件中有沒有沒被注釋掉的skip-federated字段,如果有就立即注釋掉。

(6)錯誤日志目錄不存在

去my.cnf文件下是否有log日志配置路徑,如果有,查看下日志目錄是否存在,日志目錄權限要確保是mysql啟動用戶權限。

(7)selinux惹的禍,如果是centos系統,默認會開啟selinux

閉它,打開/etc/selinux/config,把SELINUX=enforcing改為SELINUX=disabled後存盤退出重啟機器試試。
(8)重新初始化mysql數據試試

切換到mysql的安裝目錄下

./scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/data/mysql/data --user=mysql

--------------------------------

使用mysql服務端授權的信息登錄mysql,報錯如下:

ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.1.14' (111)

可能的原因有:

1)可能網絡連接問題,遠程ping 192.168.1.14 ,能ping通,排除此情況;

2)mysql服務端192.168.1.14的iptables裡做了3306端口連接的白名單限制;

3)mysql服務端192.168.1.14的my.cnf文件裡配置了bind_address地址綁定,不允許本機連接;

4)mysql服務端192.168.1.14的my.cnf文件裡配置了skip_networking,這使用MySQL只能通過本機Socket連接(socket連接也是本地連接的默認方式),放棄對TCP/IP的監聽;

5)排查DNS解析問題,檢查mysql服務端192.168.1.14的my.cnf文件裡是否設置了skip_name_resolve。這個參數加上後,不支持主機名的連接方式。

6)排查--port問題,有可能mysql服務端192.168.1.14的MySQL port不是默認3306,比如是3307端口,這樣,遠程連接的時候要加上--port=3307

7)排查用戶和密碼問題, 其實用戶和密碼的錯誤,不會出現111的,所以排除用戶密碼問題
ERROR 1045 (28000): Access denied for user 'root'@'XXXX' (using password: YES)

以上這篇淺談mysql密碼遺忘和登陸報錯的問題就是小編分享給大家的全部內容了,希望能給大家一個參考,也希望大家多多支持。

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