报错信息：mysqlnd cannot connect to MySQL 4.1+ using the old
insecure authentication. Please use an administration tool to reset your
password with the command SET PASSWORD = PASSWORD('your_existing_password').
This will store a new, and more secure, hash value in mysql.user. If this
user is used in other scripts executed by PHP 5.2 or earlier you might
need to remove the old-passwords flag from your my.cnf fileSQLSTATE[HY000] [2000] mysqlnd cannot connect to MySQL 4.1+ using old authentication After struggling a while on google, I cannot find any solution. So I went back to the RTFM idiomatic expression.
It is what I found:
- php 5.3 now use a native extension to use mysql : mysqlnd
- my database credential was old (4 years old maybe) and still use the old mysql authentication
- mysqlnd needs the new 41bytes password
- Remove or comment old_passwords = 1 in my.cnf
Restart MySQL. If you don’t, MySQL will keep using the old password format, which will mean that you cannot upgrade the passwords using the builtin PASSWORD() hashing function.
The old password hashes are 16 characters, the new ones are 41 characters.
Connect to the database, and run the following query:
SELECT user, Length(
Password) FROMmysql.user;
This will show you which passwords are in the old format, ex:
+----------+--------------------+ | user | Length(`Password`) | +----------+--------------------+ | root | 41 | | root | 16 | | user2 | 16 | | user2 | 16 | +----------+--------------------+
Notice here that each user can have multiple rows (one for each different host specification).
To update the password for each user, run the following:
UPDATE mysql.user SET Password = PASSWORD('password') WHERE user = 'username';
Finally, flush privileges:
FLUSH PRIVILEGES;