[MySQL] Mariadb初始登陆报错 ERROR 1045 (28000) 的解决办法

[root@node ~]# mysql
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

[root@node ~]# systemctl stop mariadb.service

[root@node ~]# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
[1] 4120
[root@node ~]# 170301 11:04:57 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'.
170301 11:04:57 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

[root@node ~]# mysql -u root mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 1
Server version: 5.5.52-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [mysql]>

MariaDB [mysql]> UPDATE user SET PASSWORD=PASSWORD('newpassword') where USER='root';
Query OK, 4 rows affected (0.00 sec)
Rows matched: 4  Changed: 4  Warnings: 0
MariaDB [mysql]> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
MariaDB [mysql]> QUIT
Bye
[root@node ~]#

[root@node ~]# mysql -uroot -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 6
Server version: 5.5.52-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>