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yegor256
Asked: 2012-07-28 03:40:23 +0800 CST

Can't use mysqld with empty password from command line

  • 772

First, I create a database directory:

$ mysql_install_db --datadir=./foo

Then, I start mysql daemon:

$ mysqld --port=5555 --datadir=./foo &

It starts fine and I can connect to it using, for example, Navicat. I'm trying to connect from shell:

$ mysql --user=root --port=5555 --password=
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

What to do? I also tried to change password first for root user:

$ mysqladmin -u root -P 5555 password foo
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'

Again, connection works perfectly fine from a standalone SQL application, like Navicat.

mysql

3 Answers

  1. In MySQL, the user accounts include the host you are connecting from. Hence, root@localhost and [email protected] are different users and can have different passwords. Either of them can also not even exist.

    Try this query and check whether your root users have different passwords.

    SELECT user, host, password FROM mysql.user WHERE user = 'root';

    If they do, log in using whatever method works and change the password of the root@localhost user to what you want it to be. (An empty string will be no password, however no password, especially for privileged users, is generally considered to be a bad idea.)

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  2. Here is the trick:

    $ mysqld --port=5555 --datadir=./foo --socket=./sock &

    And then later:

    $ mysql --socket=./sock --user=root --port=5555

    Works fine.

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  3. There are two ways that I am aware of to log in to an account with an empty or blank password. The first is to just omit the password option.

    $ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 163714
Server version: 5.6.38 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

    Another way is to specify the -p option, and just hit the enter key when prompted.

    $ mysql -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 163719
Server version: 5.6.38 MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>
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