Tiup 扩容Tiflash时，创建用户失败

[bglmmz]

ubuntu 18.04
TiDB 4.0.4
因为原集群没有安装TiFlash组件，这次我想扩容2台TiFlash，scale-out.yaml内如如下：

tiflash_servers:
  - host: 192.168.16.99
  - host: 192.168.16.100

99/100允许root登录，在192.168.16.101机器上，预先ssh 99/100，下载了公钥，然后执行:

tiup cluster scale-out tidb_test scale-out.yaml -p

输入登录99/100的密码后，显示如下错误提示：

  - Download tiflash:v4.0.4 (linux/amd64) ... Done
+ [ Serial ] - RootSSH: user=juzix, host=192.168.16.99, port=22
+ [ Serial ] - EnvInit: user=tidb, host=192.168.16.99

Error: Failed to initialize TiDB environment on remote host '192.168.16.99' (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 'juzix@192.168.16.99:22'
      caused by: Process exited with status 1

Verbose debug logs has been written to /home/juzix/logs/tiup-cluster-debug-2020-08-24-03-56-31.log.

Command output on remote host 192.168.16.99:
sudo: no tty present and no askpass program specified
Error: run `/home/juzix/.tiup/components/cluster/v1.0.9/tiup-cluster` (wd:/home/juzix/.tiup/data/S8YDy9A) failed: exit status 1

请问，是不是因为操作系统ubuntu的创建用户命令不同导致？改如何完成我的扩容？

谢谢！

[来了老弟]

确认下，当前集群是否为 Ubuntu 系统。建议集群内 os 保持一致。请先预检一下

[bglmmz]

Linux version 4.15.0-106-generic (buildd@lcy01-amd64-016) (gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)) #107-Ubuntu SMP Thu Jun 4 11:27:52 UTC 2020

[bglmmz]

确认过，都是ubuntu系统，

[bglmmz]

能否解答下问题？谢谢！

[来了老弟]

感谢反馈，确认下部署用户和运维用户哈，
这边从一楼日志中看到创建 tidb 用户失败，最下面一行是在 /home/juzix 用户目录下创建信息，辛苦检查下。

[bglmmz]

为远程机器打开sudo免密后，扩容成功，谢谢！

[yilong (yi888long)]