Turn off --skip-grant-tables in MySQL

Login to mysql

 mysql -u root -p

Then execute:

FLUSH PRIVILEGES;

http://dev.mysql.com/doc/refman/5.0/en/server-options.html http://dev.mysql.com/doc/refman/5.0/en/mysqladmin.html

You can make this done by using below steps.

[root@backups1 mysql5.7]# bin/mysqld_safe --skip-grant-tables --user=mysql

connect to your mysql without password.

mysql> flush privileges;
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '';
mysql> flush privileges;

switch to normal mode of mysql then connect without password.

This surely will work for you.

Slight modifications from @mansur ali

MYSQL 8, Ubuntu 18.04

[ubuntu@ip-172-31-39-173]$  sudo /usr/bin/mysqld_safe --skip-grant-tables --user=mysql

connect to your mysql without password in another shell by executing

$ mysql

then

mysql> flush privileges;
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '';
mysql> flush privileges;
mysql> quit;

switch to normal mode of mysql then connect without password.

This surely will work for you.

Yesterday I've encountered similar issue. The server was using Amazon Linux 2 as OS and the official yum repository (the el7 ones) as the installation means.

Especially when you are using the MySQL of the official yum repo, MySQL would be installed as a systemd service. In such case, you can check how MySQL process is launched by executing following command: sudo service mysql status -l. This results in description of the current status of the current mysql service. Of those descriptions, I could find following line:

  Process: 26474 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS

In my environment, it turned out that the MYSQLD_OPTS variable was set with value --skip-grant-tables option by the systemd process. To confirm the environment variables set by systemd, you can execute sudo systemctl show and look for line starting with Environment=.

To change this environment variable, I executed following command.

sudo systemctl set-environment MYSQLD_OPTS=""

After this operation, I restarted the mysqld service by sudo service mysql restart, and everything was working perfectly.

I have an update in solution. If what has been suggested above doesn't fix your problem, then this might be it. I took some time reading the logs, and figured the problem is the encryption algorithm being deprecated.

for starters, start the mysqld in safe mode with skipping grant tables.

> sudo mysqld_safe --skip-grant-tables --user=mysql

Then, I ran,

> mysql

Next, the commands I ran came back with errors as below:

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

mysql>  ALTER USER 'root'@'localhost' IDENTIFIED BY 'password';
ERROR 1524 (HY000): Plugin 'auth_socket' is not loaded

And the logs said,

Plugin mysql_native_password reported: ''mysql_native_password' is deprecated and will be removed in a future release. Please use caching_sha2_password instead'

Then I ran,

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'password';
Query OK, 0 rows affected (0.01 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

I tested this. This worked for me.