Client does not support authentication protocol requested by server; consider upgrading MySQL client

[에러]
Client does not support authentication protocol requested by server; consider upgrading MySQL client

[원인]
설치한 버전의 mysql 버전이 달라서 생기는 경우

[해결]
mysql 로그인 후 아래와 같이 OLD_PASSWORD 설정을 합니다.

mysql> use mysql;
mysql> set password for sysdocu@localhost = OLD_PASSWORD('sysdocu!@#$');
mysql> flush privileges;