To enable SSH agent forwarding when connecting to Slurm computation nodes, you need to ensure two things:

1. Your local SSH agent is running and has the relevant keys loaded.
2. The SSH connection to the Slurm master node forwards the agent.

1. Ensure ssh-agent is running and keys are loaded

On your local machine (not the Slurm nodes), make sure your SSH agent is running and your keys are loaded:

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eval $(ssh-agent -s)
ssh-add ~/.ssh/id_ed25519  # Replace with your key path if different

2. Configure SSH agent forwarding in ~/.ssh/config

On your local machine, edit or create ~/.ssh/config and add:

plaintext
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Host dalia.idris.fr
  ForwardAgent yes

If you connect to the Slurm master node via a bastion/jump host, you need to ensure the forwarding is set up for the entire chain:

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Host dalia.idris.fr
  ForwardAgent yes

Host *.idris.fr
  ForwardAgent yes

3. Connect to the Slurm master node with agent forwarding

When you SSH into the Slurm master node, use:

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ssh -A dalia.idris.fr

4. For Slurm jobs

When submitting a job or connecting to a computation node via srun or sbatch, ensure you use the -A flag:

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srun -A --jobid=<jobid> ssh <computation-node-ip>

Or, if you use sbatch:

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#SBATCH --get-user-env=1

This ensures the agent is forwarded to the computation node.

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Summary:

• Your ssh-add -L works on the master node because the agent is forwarded.
• On computation nodes, the agent is not forwarded by default unless you use -A or configure Slurm to forward it.