我希望借助以下代码在不同的Google云计算实例上通过MPI显示“hello world”:
from mpi4py import MPI
size = MPI.COMM_WORLD.Get_size()
rank = MPI.COMM_WORLD.Get_rank()
name = MPI.Get_processor_name()
print("Hello, World! I am process/rank {} of {} on {}.\n".format(rank, size, name))
问题是,即便如此,我可以毫无问题地连接所有这些实例,当我尝试运行我的脚本时,我收到一条权限被拒绝的错误消息。我使用以下命令来调用我的脚本:
mpirun --host localhost,instance_1,instance_2 python hello_world.py
并收到以下错误消息:
Permission denied (publickey).
--------------------------------------------------------------------------
ORTE was unable to reliably start one or more daemons.
This usually is caused by:
* not finding the required libraries and/or binaries on
one or more nodes. Please check your PATH and LD_LIBRARY_PATH
settings, or configure OMPI with --enable-orterun-prefix-by-default
* lack of authority to execute on one or more specified nodes.
Please verify your allocation and authorities.
* the inability to write startup files into /tmp (--tmpdir/orte_tmpdir_base).
Please check with your sys admin to determine the correct location to use.
* compilation of the orted with dynamic libraries when static are required
(e.g., on Cray). Please check your configure cmd line and consider using
one of the contrib/platform definitions for your system type.
* an inability to create a connection back to mpirun due to a
lack of common network interfaces and/or no route found between
them. Please check network connectivity (including firewalls
and network routing requirements).
--------------------------------------------------------------------------
其他信息:
感谢您的帮助: - )
新信息:
(感谢@ Zulan指出我应该编辑我以前的帖子而不是为新信息创建新答案)
所以,我尝试用mpich而不是openmpi做同样的事情。但是,我遇到了类似的错误消息。
命令:
mpirun --host localhost,instance_1,instance_2 python hello_world.py
错误讯息:
Host key verification failed.
我可以毫无问题地连接我的两个实例,并且通过gcloud命令可以自动正确设置ssh-keys。
那么,有人知道问题可能是什么吗?我还检查了路径,防火墙规则以及我在temp-folder中编写启动脚本的能力。有人可以尝试重新创建这个问题吗? +我应该向谷歌提出这个问题吗? (从来没有做过这样的事情,我很不确定:S)
感谢您提供帮助:)
答案 0 :(得分:1)
所以我终于找到了解决方案。哇,问题让我疯了。
事实证明,我需要手动生成ssh-key才能使脚本正常工作。我不明白为什么,因为谷歌服务已经通过使用设置了密钥
gcloud compute ssh
,但是,它有效:)
我做的步骤:
instance_1 $ ssh-keygen -t rsa
instance_1 $ cd .ssh
instance_1 $ cat id_rsa.pub >> authorized_keys
instance_1 $ gcloud compute copy-files id_rsa.pub
instance_1 $ gcloud compute ssh instance_2
instance_2 $ cd .ssh
instance_2 $ cat id_rsa.pub >> authorized_keys
我将打开另一个主题并询问为什么我不能使用ssh instance_2
,即使如此gcloud compute ssh instance_2
正在运作。请参阅:Difference between the commands "gcloud compute ssh" and "ssh"