---
title: 指定主机名错误，报错：Name or service not known
description: "提交MPI作业时指定hostfile中的主机名错误导致mpirun命令运行失败。"
url: https://www.hikunpeng.com/document/detail/zh/kunpenghpcs/hpckit/devg/userg_huaweimpi_0045.html
sourcePath: /source/zh/kunpenghpcs/hpckit/devg/userg_huaweimpi_0045.html
indexId: 3d833d894361bb0d04c60ef944a176dc8605a350155371c5b735dafb79375ce460
---
# 指定主机名错误，报错：Name or service not known

#### 现象描述

提交MPI作业时指定hostfile中的主机名错误导致mpirun命令运行失败。

运行失败示例如下：

mpirun -np 16 -N 2 --hostfile ~/hmpifile_2021/hostfile/hf8 -x UCX_NET_DEVICES=mlx5_0:1 /home/hmpi_user/hmpifile_2021/allreduce/AllReduce

```
ssh: Could not resolve hostname arm-node056: Name or service not known
--------------------------------------------------------------------------
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).
--------------------------------------------------------------------------
--------------------------------------------------------------------------
ORTE does not know how to route a message to the specified daemon
located on the indicated node:
my node:   arm-node056
target node:  arm-node011
This is usually an internal programming error that should be
reported to the developers. In the meantime, a workaround may
be to set the MCA param routed=direct on the command line or
in your environment. We apologize for the problem.
--------------------------------------------------------------------------
[arm-node132:2640389] 5 more processes have sent help message help-errmgr-base.txt / no-path
[arm-node132:2640389] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages
```


#### 可能原因

运行mpirun命令时hf8文件中指定的主机名在局域网中不存在。


#### 恢复步骤

1. 使用PuTTY工具，以Hyper MPI普通用户（例如“hmpi_user”）登录至作业执行节点。
2. 执行以下命令，修改“hf8”文件。

  a. 打开“hf8”文件。
    vi ~/hmpifile_2021/hostfile/hf8

- ~/hmpifile_2021/hostfile：表示指定作业运行节点的文件路径。

- hf8：表示指定作业运行节点的文件。


  a. 按“i”进入编辑模式，根据错误提示将“arm-node056”改成“arm-node134”（局域网中存在此主机名）。

```
arm-node134
```


  b. 按“Esc”键，输入:wq!，按“Enter”保存并退出编辑。
3. 执行以下命令，验证“hf8”文件是否修改成功。
  mpirun -np 16 -N 2 --hostfile ~/hmpifile_2021/hostfile/hf8 -x UCX_NET_DEVICES=mlx5_0:1 ~/hmpifile_2021/allreduce/AllReduce

  ~/hmpifile_2021/allreduce：表示指定运行作业的路径。 AllReduce：表示指定的运行作业。

  出现以下回显信息，表示“hf8”文件修改成功。

```
All tests are success
```