Permissions 0644 for '/root/.ssh/id_rsa' are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
bad permissions: ignore key: /root/.ssh/id_rsa
Permission denied (publickey).
fatal: The remote end hung up unexpectedly ssh
解決方式:
chmod 0600 /root/.ssh/id_rsa ui