Mariadb change the root password and start the database skipped License

By default, mariadb password yum install new way is empty, the input terminal will be able to mysql shell landed directly in the database.

If you just installed the first time, use the mysql_secure_installation command to initialize.

# mysql_secure_installation
 
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!
 
In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.
 
Enter current password for root (enter for none):
OK, successfully used password, moving on...
 
Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.
 
Set root password? [Y/n] y
New password:
Re-enter new password:
Password updated successfully!
Reloading privilege tables..
 ... Success!
 
 
By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB 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? [Y/n] 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? [Y/n] y
 ... Success!
 
By default, MariaDB 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? [Y/n] 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? [Y/n] y
 ... Success!
 
Cleaning up...
 
All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.
 
Thanks for using MariaDB!

Here it is directed to know the root password, but the situation needs to be modified.

Both editing methods:

1, directly in the shell command line using the command mysqladm modification.

# Mysqladmin -uroot -poldpassword password newpassword 
 
of this approach is that malpractice will be displayed in plain text password.

 2, modify the database login password.

# Mysql -uroot -p 
 
update mysql database fields in the user table 2.1: 
MariaDB [(none)]> use mysql;   
MariaDB [mysql]> = the UPDATE password the SET user password ( 'NewPassword') the WHERE user = 'the root';   
MariaDB [MySQL]> the flush privileges;   
MariaDB [MySQL]> Exit; 
 
2.2 or use the set command to set the root password: 
MariaDB [(none)]> the sET password for 'root' @ 'localhost' = password ( 'NewPassword');   
MariaDB [(none)]> exit;

If you have forgotten the root password, you need to skip the manner authorized mariadb start to change the password.

1, first stopped service.

# systemctl stop mariadb

2, skipping authorized way to start mariadb.

# mysqld_safe --skip-grant-tables &
[1] 1441
[root@centos7 ~]# 170531 02:10:28 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
170531 02:10:28 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
 
# ps -ef | grep 1441
root      1441   966  0 02:10 pts/0    00:00:00 /bin/sh /usr/bin/mysqld_safe --skip-grant-tables
mysql     1584  1441  0 02:10 pts/0    00:00:00 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --skip-grant-tables --log-error=/var/log/mariadb/mariadb.log --pid-file=/var/run/mariadb/mariadb.pid
                                                --socket=/var/lib/mysql/mysql.sock

3, when the skip authorized to start, you can log in directly to the database without a password. Log in to update password.

# MySQL 
MariaDB [(none)]> use MySQL;   
MariaDB [MySQL]> the UPDATE User the SET password = password ( 'NewPassword') the WHERE User = 'the root';   
MariaDB [MySQL]> the flush privileges;    
MariaDB [MySQL]> Exit; 
 
after updating the password for skipping a blank password can not be authorized to initiate direct landed.

4, close to skip the authorization process started:

# kill -9 1441 

5, the normal start mariadb:

# systemctl start mariadb