mysql error 1045 access denied for user 'root'@'localhost' 해결

에러내용 : mysql error 1045 access denied for user 'root'@'localhost'

내용 : root 계정에 대한 localhost 접근이 거부되었다.

원인 : mysql 설치 후 root 계정에 대한 비밀번호가 설정되지 않았기 때문이다.

해결방법 : root@localhost에 대한 비밀번호 설정

root@DESKTOP-8UHKC1S:/home/cms# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 26
Server version: 8.0.28-0ubuntu0.20.04.3 (Ubuntu)

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Oracle is a registered trademark of Oracle Corporation and/or its
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owners.

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

mysql> alter user root@localhost identified by '새로운 비밀번호';