TiUP deploy error ：` if killed, check the password prompt}, cause: signal: killed`

General Question

是否添加到 TiUP FAQ？

Linux 主机之间使用带有密码保护的 ssh-key 互信
TiUP deploy 部署时，出现 if killed, check the password prompt}, cause: signal: killed 错误
需要通过 -i 指定该 ssh-key 文件，如 -i /root/.ssh/id_rsa

tiup cluster deploy nji nightly db.yaml  --ssh=system -u root 
Starting component `cluster`: /root/.tiup/components/cluster/v1.2.3/tiup-cluster deploy nji nightly db.yaml --ssh=system -u root

  - Prepare 172.16.4.178:22 ... Error

Error: Failed to initialize TiDB environment on remote host '172.16.4.178' (task.env_init.failed)
  caused by: Failed to create new system user 'tidb' on remote host
    caused by: Failed to execute command over SSH for 'root@172.16.4.178:22'
      caused by: exit status 255

Verbose debug logs has been written to /root/logs/tiup-cluster-debug-2020-11-03-16-06-17.log.

Command output on remote host 172.16.4.178:
Permission denied, please try again.
Permission denied, please try again.
Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).

TiUP debug logs:

  if killed, check the password prompt}, cause: signal: killed

Locate the TiUP FAQ or deployment documentation and review how SSH options are currently documented. Add the password-protected SSH-key case, including the -i /root/.ssh/id_rsa example and the related error, then verify that the guidance clearly explains how to avoid the failed password prompt.