Lesson: Setting up SSH config

[mahesh-panchal]

Setting up ssh config

• How to set up ssh for Rackham, Dardel, NAC.
• How to use a jump host.
• How to use port forwarding (browsing webpages locally running on cluster, running jupyter/marimo on a cluster).
• Agent forwarding
• Dynamic forwarding: Use the login node as a jump host to the nodes.

Example:

# Example for your HPC cluster
Host hpc_cluster
    HostName cluster.example.com  # The actual hostname or IP address
    User your_username          # Your username on the cluster
    Port 22                     # SSH port (default is 22)
    IdentityFile ~/.ssh/id_rsa_hpc # Path to your private key for the cluster
    # Forward your local port 8888 to the cluster's port 8888 (for Jupyter)
    LocalForward 8888 localhost:8888  # If Jupyter running on the login node
    # OR, if Jupyter running on a worker node, and you know the worker node's internal IP:
    # LocalForward 8888 worker_node_internal_ip:8888
    # OR, for dynamic port forwarding to a worker node (more complex, see below):
    # DynamicForward 8888
    # If using a jump host to access worker nodes:
    # ProxyJump jump_host_user@jump_host:port


# Example for a specific worker node (if you connect directly)
Host worker1
    HostName worker1.internal.cluster  # Internal IP or hostname
    User your_username
    IdentityFile ~/.ssh/id_rsa_hpc
    # No ProxyJump needed if connecting directly

# Example for a jump host (if needed for worker node access)
Host jump_host
    HostName jump_host.example.com
    User jump_host_user
    IdentityFile ~/.ssh/id_rsa_jump


# Example for your local machine (less common, but can be useful)
Host localhost
    User your_local_username  # Useful if different from your system username
    IdentityFile ~/.ssh/id_rsa_local # Optional, if you use a specific key for local

Extra: sshfs to mount remote directories locally.