原因是由于root用户没有SYSTEM_USER权限，把权限加入后即可解决：
grant system_user on *.* to 'root';
- SYSTEM_USER privilege operation Access deniedsystem_user privilege operation access 39 password access denied status_access_denied localhost password access denied access denied clone basic access denied basic http localhost ubuntu access denied 39 localhost access denied maxwell mysql access denied database access denied xxxxxx