JupyterHub can’t find Config file and Bastion key file

[Robin Schelstraete]

Hi all,

I have been working on an experiment for some months now using FABRIC slices. First time working in the JupyterHub I ran the configure notebook without any problems. However, when coming back from a break a few moments ago, suddenly I get the error that no config file exists (error screenshot in attachment). I tried to fix this by running my config file again, but suddenly FABRIC is unable to find my bastion key file location (error screenshot also in attachment), even though I haven’t changed anything and the path should be right. I tried editing the path anyways, but nothing works.
Is there any way to resolve this?

Kind regards,

 

Robin

[Komal Thareja]

Hi Robin,

Config notebook has been updated to avoid such errors.

Could you please run the notebook: jupyter-examples-rel1.6.1/configure_and_validate.ipynb ?

This should update your bastion keys if expired or do not exist. Please try creating a slice and SSH access again after that from console as well as the notebook. Please restart the notebook kernel after the keys are updated.

Thanks,

Komal

[Robin Schelstraete]

Hi Komal,

Thank you for your quick response. In the meantime I have restarted my server via the control panel, now I have a new error (screenshot attached).

You said to run the jupyter-examples-rel1.6.1/configure_and_validate.ipynb notebook, does it matter that my files are all in jupyter-examples-rel1.5.4?

Thanks,

Robin

[Komal Thareja]

The error observed is because of the incomplete config. You can run the configure notebook from the path jupyter-examples-rel1.6.1/configure_and_validate.ipynb without impacting your experiments.

This only sets up your environment. Experiments from rel-1.5.4 would still work after the config.

Thanks,

Komal

1 user thanked author for this post.

Robin Schelstraete

[Robin Schelstraete]

I ran the notebook without any problems. Everything works as expected now. Thank you Komal!

Kind regards,

Robin

 

[Robin Schelstraete]

Hi Komal,

I now have an issue SSH’ing into my nodes (error in attachment) because of a bad configuration. Can this be because of the issue we just discussed?

Kind regards,

Robin

[Komal Thareja]

Could you please share the output of the command cat /home/fabric/work/fabric_config/ssh_config ?

If this file already existed, the notebook wouldn’t have made any changes to it. Looks like line 5 has some issues.

Sharing example contents of this file below with BASTION USERNAME MASKED:

UserKnownHostsFile /dev/null
StrictHostKeyChecking no
ServerAliveInterval 120
Host bastion.fabric-testbed.net
User YOUR_BASTION_USER_NAME
ForwardAgent yes
Hostname %h
IdentityFile /home/fabric/work/fabric_config/fabric_bastion_key
IdentitiesOnly yes
Host * !bastion.fabric-testbed.net
ProxyJump YOUR_BASTION_USER_NAME@bastion.fabric-testbed.net:22

• This reply was modified 1 month, 4 weeks ago by Komal Thareja.

[Robin Schelstraete]

The output of the command is the following:

UserKnownHostsFile /dev/null
StrictHostKeyChecking no
ServerAliveInterval 120
Host bastion-?.fabric-testbed.net
User <Update Bastion User Name>
ForwardAgent yes
Hostname %h
IdentityFile /home/fabric/work/fabric_config/fabric-bastion-key
IdentitiesOnly yes
Host * !bastion-?.fabric-testbed.net
ProxyJump <Update Bastion User Name>@bastion.fabric-testbed.net:22

[Komal Thareja]

Could you please remove the file /home/fabric/work/fabric_config/ssh_config and re-run the jupyter-examples-rel1.6.1/configure_and_validate.ipynb notebook? This shall fix the config issue.

Thanks,
Komal

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