MySQL 접근 시 Access denied for user 'root'@'localhost' 해결 방법

# sudo mysql -u root -p 를 입력하면, 관리자 권한으로 실행하고, root 패스워드와 mysql 사용자 패스워드를 물어본다.
2개다 올바르게 입력하면 정상적으로 mysql로 접근 할 수 있다.

monitoring-server@monitoringserver-Virtual-Machine:/$ mysql -u root -p
Enter password:
ERROR 1698 (28000): Access denied for user 'root'@'localhost'

monitoring-server@monitoringserver-Virtual-Machine:/$ sudo mysql -u root -p
[sudo] monitoring-server의 암호:
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 95
Server version: 5.7.36-0ubuntu0.18.04.1 (Ubuntu)

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

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| zabbix             |
+--------------------+
5 rows in set (0.07 sec)

- 끝 -