運維筆記--linux下忘記mysql root密碼

補充連接：Windows下忘記密碼處理: http://www.javashuo.com/article/p-uhhhwgvw-dp.html

場景描述：

Linux環境下忘記 root 密碼，

1. 修改MySQL的登陸設置： 
# vim /etc/my.cnf 
在[mysqld]的段中加上一句：skip-grant-tables 
例如： 
[mysqld] 
datadir=/var/lib/mysql 
socket=/var/lib/mysql/mysql.sock 
skip-grant-tables 
保存而且退出vi。

2. 從新啓動mysqld 
# service mysqld restart 
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]

3. 登陸並修改MySQL的root密碼 

# mysql 
Welcome to the MySQL monitor. Commands end with ; or \g. 
Your MySQL connection id is 3 to server version: 3.23.56 
Type 'help;' or '\h' for help. Type '\c' to clear the buffer. 
mysql> USE mysql ; 
Database changed 
mysql> UPDATE user SET Password = password ( 'new-password' ) WHERE User = 'root' ; 
Query OK, 0 rows affected (0.00 sec) 
Rows matched: 2 Changed: 0 Warnings: 0 
mysql> flush privileges ; 
Query OK, 0 rows affected (0.01 sec) 
mysql> quit

4．將MySQL的登陸設置修改回來 
# vim /etc/my.cnf 
將剛纔在[mysqld]的段中加上的skip-grant-tables刪除 
保存而且退出vim

5．從新啓動mysqld 
# service mysqld restart 
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]

************************************************

6. 配置mysql容許遠程鏈接：

容許遠程用戶登陸訪問mysql的方法
須要手動增長能夠遠程訪問數據庫的用戶。

方法一(不推薦) 本地登入mysql，更改 "mysql" 數據庫裏的 "user" 表裏的 "host" 項，將"localhost"改成"%"

#mysql -u root -proot

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

方法二 直接受權(推薦)

從任何主機上使用root用戶，密碼：youpassword（你的root密碼）鏈接到mysql服務器：（首先登錄Linux服務器，填寫下面代碼便可）

[root@localhost software]# mysql -u root -proot 
mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'youpassword' WITH GRANT OPTION;
mysql>FLUSH PRIVILEGES;

操做完後切記執行如下命令刷新權限

FLUSH PRIVILEGES;

方法三：終極方法

找到mysql.cnf

註釋bind-address = 127.0.0.1

改成bind-address = 0.0.0.0

重啓服務。

方法四： 給指定用戶受權  --不須要刷新，重啓數據庫

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 host = '%' where user = '你的用戶';

Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0