问题:

So... I'm setting up a new server and keep running into this problem.

When I try to login to the MySQL database with the root user, I get the "ERROR 1698 (28000): Access denied for user 'root'@'localhost'" error.

It doesn't matter if I connect through the terminal(SSH), through PHPMyAdmin or a MySQL Client, e.g. Navicat. They all fail.

I looked in the mysql.user table and get the following:

+------------------+-------------------+ | user             | host              | +------------------+-------------------+ | root             | %                 | | root             | 127.0.0.1         | | amavisd          | localhost         | | debian-sys-maint | localhost         | | iredadmin        | localhost         | | iredapd          | localhost         | | mysql.sys        | localhost         | | phpmyadmin       | localhost         | | root             | localhost         | | roundcube        | localhost         | | vmail            | localhost         | | vmailadmin       | localhost         | | amavisd          | test4.folkmann.it | | iredadmin        | test4.folkmann.it | | iredapd          | test4.folkmann.it | | roundcube        | test4.folkmann.it | | vmail            | test4.folkmann.it | | vmailadmin       | test4.folkmann.it | +------------------+-------------------+

As you can see, root should have access.

The Server is quite simple, as I have tried to troubleshoot this for a while now..

It's running Ubuntu 16.04.1 LTS with Apache, MySQL and PHP, so that it can host websites, and iRedMail 0.9.5-1, so that it can host mail.

Login in to the MySQL database works fine before I install iRedMail. I also tried, just installing iRedMail, but then root, also doesn't work...

If someone could tell me how I fix my MySQL login problem or how I install iRedMail, on top of an existing MySQL install. And yes I tried the Installation Tips and I can't find those variables in the config files.

Any help is much appreciated :)

回答1:

The reason is that recent Ubuntu installation (maybe others also), mysql is using by default the UNIX auth_socket plugin.

Basically means that: db_users using it, will be "auth" by the system user credentias. You can see if your root user is set up like this by doing the following:

$ sudo mysql -u root # I had to use "sudo" since is new installation  mysql> USE mysql; mysql> SELECT User, Host, plugin FROM mysql.user;  +------------------+-----------------------+ | User             | plugin                | +------------------+-----------------------+ | root             | auth_socket           | | mysql.sys        | mysql_native_password | | debian-sys-maint | mysql_native_password | +------------------+-----------------------+

As you can see in the query, the root user is using the auth_socket plugin

There are 2 ways to solve this:

You can set the root user to use the mysql_native_password plugin
You can create a new db_user with you system_user (recommended)

Option 1:

$ sudo mysql -u root # I had to use "sudo" since is new installation  mysql> USE mysql; mysql> UPDATE user SET plugin='mysql_native_password' WHERE User='root'; mysql> FLUSH PRIVILEGES; mysql> exit;  $ service mysql restart

Option 2: (replace YOUR_SYSTEM_USER with the username you have)

$ sudo mysql -u root # I had to use "sudo" since is new installation  mysql> USE mysql; mysql> CREATE USER 'YOUR_SYSTEM_USER'@'localhost' IDENTIFIED BY ''; mysql> GRANT ALL PRIVILEGES ON *.* TO 'YOUR_SYSTEM_USER'@'localhost'; mysql> UPDATE user SET plugin='auth_socket' WHERE User='YOUR_SYSTEM_USER'; mysql> FLUSH PRIVILEGES; mysql> exit;  $ service mysql restart

Remember that if you use option #2 you'll have to connect to mysql as your system username (mysql -u YOUR_SYSTEM_USER)

Note: On some systems (e.g., Debian stretch) 'auth_socket' plugin is called 'unix_socket', so the corresponding SQL command should be: UPDATE user SET plugin='unix_socket' WHERE User='YOUR_SYSTEM_USER';

回答2:

If you could login with sudo but not without sudo then do:

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

Once done, open a new shell, and then:

$ mysql -u root -p without sudo will work just fine.

回答3:

You want to access MySQL with root user but you're not providing root's correct password.

If you need to set a new password for root, MySQL's site has great documentation on how to do it: http://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.html

I'll not show the process in here because MySql documentation on the above link it's clear and concise.

回答4:

I would suggest to remove the Mysql connection -

UPDATE-This is for Mysql version 5.5,if your version is different ,please change the first line accordingly

sudo apt-get purge mysql-server mysql-client mysql-common mysql-server-core-5.5 mysql-client-core-5.5 sudo rm -rf /etc/mysql /var/lib/mysql sudo apt-get autoremove sudo apt-get autoclean

And Install Again But this time set a root password yourself. This will save a lot of effort.

sudo apt-get update sudo apt-get install mysql-server

回答5:

I was having this issue on an Debian 8 VM that I was interacting with through Putty on my Windows 10 desktop.

I tried the various suggestions on here but nothing quite worked and I am running MariaDB on the Debian host. In the end I found that I couldn't start the db server in safe mode but I didn't need to and the following commands actually worked for me i.e. allowing a newly created MySql user to log into the MySql/MariaDB server:

sudo service mysql stop sudo mysql # logs in automatically into MariaDB use mysql; update user set plugin='' where user='your_user_name'; flush privileges; exit; sudo service mysql restart # restarts the mysql service