mysql hoe de toegang geweigerd voor gebruiker 'root'@'localhost'

Volg de onderstaande stappen.

1. Start de MySQL server instance of daemon met de optie --skip-grant-tables (veiligheidsinstelling).

2. Voer deze verklaringen uit.

Als u geconfronteerd wordt met het onbekende veld Wachtwoordfout boven gebruik:

update user set authentication_string=password('my_password') where user='root';

1. 1. Start tenslotte de instantie/daemon opnieuw op zonder de optie --skip-grant-tables.

2. U zou nu verbinding moeten kunnen maken met uw nieuwe wachtwoord.

$ mysql -u root -p

1. Voer het wachtwoord in: my_password

Fix voor MySQL “Unable to lock ibdata1” fout

sudo mv /usr/local/mysql/data/ibdata1 /usr/local/mysql/data/ibdata1.bak
sudo mv /usr/local/mysql/data/ib_logfile0 /usr/local/mysql/data/ib_logfile0.bak
sudo mv /usr/local/mysql/data/ib_logfile1 /usr/local/mysql/data/ib_logfile1.bak
sudo cp -a /usr/local/mysql/data/ibdata1.bak /usr/local/mysql/data/ibdata1
sudo cp -a /usr/local/mysql/data/ib_logfile0.bak /usr/local/mysql/data/ib_logfile0
sudo cp -a /usr/local/mysql/data/ib_logfile1.bak /usr/local/mysql/data/ib_logfile1
sudo /etc/init.d/mysql restart

Geen van bovenstaande waren nuttig voor mij. Ik vond dat ik de plugin-methode moest vrijmaken. In 5.6, kon ik:

sudo mysql -u root
use mysql;
[mysql] update user set plugin='' where User='root';
[mysql] flush privileges;

In 5.7, vond ik dat ik moest:

sudo mysql -u root
use mysql;
[mysql] update user set plugin='mysql_native_password' where User='root';
[mysql] flush privileges;

Volgens de docs, met de plugin ingesteld op een lege string, zou het effectief moeten hebben standaard op mysql_native_password, maar kan in de war raken door een lege wachtwoord hash. Voor meer nuance kunt u hier de documentatie lezen: https://dev.mysql.com/doc/refman/5.7/en/native-authentication-plugin.html (https://dev.mysql.com/doc/refman/5.7/en/native-authentication-plugin.html)

Zorg er ook voor dat het benodigde record in tabel user leeg is plugin veld (er kan bijvoorbeeld "unix_socket" zijn).

Sinds versie 5.5.7 heeft mysql verschillende auth plugins ondersteuning https://dev.mysql.com/doc/refman/5.6/en/authentication-plugins.html

Dus als u een niet-leeg plugin veld heeft dan zou het wachtwoord genegeerd worden en zou er een waarschuwing zijn bij mysql error log (voor mij is het /var/log/mysql/error.log):

[Warning] 'user' entry 'root@localhost' has both a password and an authentication plugin specified. The password will be ignored.

grep 'temporary password' /var/log/mysqld.log
Sort date (newest date)

U ziet misschien iets als dit;

[root@SERVER ~]# grep 'temporary password' /var/log/mysqld.log
2016-01-16T18:07:29.688164Z 1 [Note] A temporary password is generated for root@localhost: O,k5.marHfFu
2016-01-22T13:14:17.974391Z 1 [Note] A temporary password is generated for root@localhost: b5nvIu!jh6ql
2016-01-22T15:35:48.496812Z 1 [Note] A temporary password is generated for root@localhost: (B*=T!uWJ7ws
2016-01-22T15:52:21.088610Z 1 [Note] A temporary password is generated for root@localhost: %tJXK7sytMJV
2016-01-22T16:24:41.384205Z 1 [Note] A temporary password is generated for root@localhost: lslQDvgwr3/S
2016-01-22T22:11:24.772275Z 1 [Note] A temporary password is generated for root@localhost: S4u+J,Rce_0t
[root@SERVER ~]# mysql_secure_installation

Beveiliging van de MySQL server implementatie.

Enter password for user root: 

The existing password for the user account root has expired. Please set a new password.

New password: 

Re-enter new password:

Als u het ziet zegt

... Failed! Error: Your password does not satisfy the current policy requirements
That means your password needs to have a character such as ! . # - etc...
mix characters well, upper case, lower case, ! . , # etc...

New password: 

Re-enter new password: 
The 'validate_password' plugin is installed on the server.
The subsequent steps will run with the existing configuration
of the plugin.
Using existing password for root.

Estimated strength of the password: 100 
Change the password for root ? ((Press y|Y for Yes, any other key for No) : Y

New password: 

Re-enter new password: 

Estimated strength of the password: 100 
Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : Y
By default, a MySQL installation has an anonymous user,
allowing anyone to log into MySQL without having to have
a user account created for them. This is intended only for
testing, and to make the installation go a bit smoother.
You should remove them before moving into a production
environment.

Remove anonymous users? (Press y|Y for Yes, any other key for No) : Y
Success.

Normally, root should only be allowed to connect from
'localhost'. This ensures that someone cannot guess at
the root password from the network.

Disallow root login remotely? (Press y|Y for Yes, any other key for No) : Y
Success.

By default, MySQL comes with a database named 'test' that
anyone can access. This is also intended only for testing,
and should be removed before moving into a production
environment.

Remove test database and access to it? (Press y|Y for Yes, any other key for No) : Y
 - Dropping test database...
Success.

 - Removing privileges on test database...
Success.

Reloading the privilege tables will ensure that all changes
made so far will take effect immediately.

Reload privilege tables now? (Press y|Y for Yes, any other key for No) : Y
Success.

All done! 
[root@SERVER ~]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 11
Server version: 5.7.10 MySQL Community Server (GPL)

Bekijk de laatste 10 minuten van deze video , het leert u hoe u het doet.

In mijn geval had ik een database corruptie, na het herstarten van mysql op Debian was de root login zonder wachtwoord. De oplossing was dit : ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'test';

In sommige andere antwoorden is ook de native_password plugin genoemd, maar dit is hoe je het kunt doen zonder ingewikkeld gepruts. Dat is hoe het bedoeld is om te veranderen.

Probeer het eens:

mysql --no-defaults --force --user=root --host=localhost --database=mysql 
UPDATE user SET Password=PASSWORD('NEWPASSWORD') where USER='root';
FLUSH PRIVILEGES;