The ssh agent cannot 'resolve hostname' when called from within a bash script

Marlo

11/25/22, 4:08 PM

I have a bash script

#!/bin/bash
scp -r some_directory remote_host:~

which I made executable with chmod u+x. The remote_host has been defined in my .ssh/config as follows:

Host remote_host
HostName ec2-x-xxx-xx-xxx.eu-central-1.compute.amazonaws.com
User ubuntu
IdentityFile ~/path_to_pem_file/pem_file.pem
IdentitiesOnly yes

when I call scp -r some_directory remote_host:~ or ssh remote_host it works without problems to access the remote machine via ssh. However inside the bash script it doesn't work. I get the following error:

ssh: Could not resolve hostname mochacle: Name or service not known
lost connection
ssh: Could not resolve hostname mochacle: Name or service not known
ssh: Could not resolve hostname mochacle: Name or service not known

irrespective of whether I sudo the execution of the script or not.

517

0 + 5

remote-access

ssh

bash

hostname

ssh-agent

Zac67

11/25/22, 5:22 PM

Have you tried the FQDN?

Gordon Davisson

11/25/22, 7:17 PM

When you run the script with `sudo`, it's running as root and hence will look in root's ~/.ssh/config file, not yours; if that doesn't have an entry for remote_host, you'll get this result. When you use the script without `sudo` and get this error, are you also running it as root (or some other user) via some other means?

Marlo

11/27/22, 12:58 AM

@Zac67: What is FQDN?

Marlo

11/27/22, 12:59 AM

@Gordon Davisson: I will try this tomorrow. I think this is the issue.

Gordon Davisson

11/27/22, 3:22 AM

@Marlo FQDN = Fully Qualified Domain Name, i.e. ec2-x-xxx-xx-xxx.eu-central-1.compute.amazonaws.com. That is, have you tried `sudo scp -r -i ~/path_to_pem_file/pem_file.pem some_directory -o IdentitiesOnly=yes [email protected]:~`

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: The ssh agent cannot 'resolve hostname' when called from within a bash script

TH: ตัวแทน ssh ไม่สามารถ 'แก้ไขชื่อโฮสต์' เมื่อเรียกจากภายในสคริปต์ทุบตี

RO: Agentul ssh nu poate „rezolva numele gazdei” atunci când este apelat dintr-un script bash

RU: Агент ssh не может «разрешить имя хоста» при вызове из сценария bash.

VI: Tác nhân ssh không thể 'phân giải tên máy chủ' khi được gọi từ bên trong tập lệnh bash

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