[root xxxxxxxxx xxxxxx]# npm install
npm ERR! code 128
npm ERR! An unknown git error occurred
npm ERR! command git --no-replace-objects ls-remote ssh:// git@github.com /nhn/raphael.git
npm ERR! git@github.com : Permission denied (publickey).
npm ERR! fatal: Could not read from remote repository.
npm ERR!
npm ERR! Please make sure you have the correct access rights
npm ERR! and the repository exists.

npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2021-09-02T01_45_13_526Z-debug.log