MySQL Fails On: MySQL "Error 1524 (Hy000): Plugin 'Auth_Socket' Is Not Loaded"

MySQL fails on: mysql ERROR 1524 (HY000): Plugin 'auth_socket' is not loaded

I got a solution!

When resetting the root password at step 2), also change the auth plugin to mysql_native_password:

use mysql;
update user set authentication_string=PASSWORD("") where User='root';
update user set plugin="mysql_native_password" where User='root';  # THIS LINE

flush privileges;
quit;

This allowed me to log in successfully!

Full code solution

1. First, run these bash commands

sudo /etc/init.d/mysql stop # stop mysql service
sudo mysqld_safe --skip-grant-tables & # start mysql without password
# enter -> go
mysql -uroot # connect to mysql

2. Then run mysql commands => copy paste this to CLI manually

use mysql; # use mysql table
update user set authentication_string=PASSWORD("") where User='root'; # update password to nothing
update user set plugin="mysql_native_password" where User='root'; # set password resolving to default mechanism for root user

flush privileges;
quit;

3. Run more bash commands

sudo /etc/init.d/mysql stop 
sudo /etc/init.d/mysql start # reset mysql
# try login to database, just press enter at password prompt because your password is now blank
mysql -u root -p 

4. Socket issue (from your comments)

When you see a socket error, a community came with 2 possible solutions:

sudo mkdir -p /var/run/mysqld; sudo chown mysql /var/run/mysqld
sudo mysqld_safe --skip-grant-tables &

(thanks to @Cerin)

Or

mkdir -p /var/run/mysqld && chown mysql:mysql /var/run/mysqld  

(thanks to @Peter Dvukhrechensky)

Blind paths and possible edge errors

Use 127.0.0.1 instead of localhost

mysql -uroot # "-hlocalhost" is default

Can lead to "missing file" or slt error.

mysql -uroot -h127.0.0.1

Works better.

Skip the socket issue

I've found many ways to create mysqld.sock file, change access rights, or symlink it. It was not the issue after all.

Skip the my.cnf file

The issue also was not there. If you are not sure, this might help you.

MySQL Won't let User Login: Error 1524

It appears your user table is corrupted. Likely the reboot you mentioned triggered an upgrade to MySQL and the mysql_upgrade script was not run. This should resolve the situation:

mysql_upgrade -u root -ppassword --skip-grant-tables
mysql -u root -ppassword -e "UPDATE mysql.user SET plugin = 'mysql_native_password' WHERE user = 'mangos'; FLUSH PRIVILEGES"

Source: http://kb.odin.com/en/126676

Providing the --force option to mysql_upgrade will re-apply the upgrade scripts even if an upgrade has already been done. This may be needed in case of partial restoration from backup.

Also worth mentioning, the command to change a user password has changed in MySQL 5.7.6 / MariaDB 10.2.0 and forward:

ALTER USER mangos IDENTIFIED BY 'mangos';

This is now the preferred method for setting the password, although the older SET PASSWORD syntax is not officially deprecated.

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