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6. Configure SSH Access

Enable secure, limited SSH access for node maintenance and define which ports and package repositories FluxOS should block.

Configuration Overview​

SettingDescription
SSH AccessGrant the operator user limited SSH permissions
Blocked PortsSpecify TCP/UDP ports that FluxOS will refuse to open or use
Blocked RepositoriesList package repositories (URLs or hostnames) to block from updates or installs

SSH Access Options​

You can choose one of three modes for SSH access to the built‑in operator account, which has restricted command capabilities:

  1. Disabled
    No SSH access permitted.
  2. Use Existing Public Key
    Paste an ed25519 public key you already generated elsewhere.
  3. Generate New Keypair
    Arcane OS will create a fresh ed25519 keypair and package it for you to download.

Step-by-Step: Generate a New SSH Keypair​

  1. Select “Generate New Keypair”
    Click the Generate New Keypair button in the SSH settings screen.
  1. Automatic Download
  • A .zip bundle is generated and downloaded automatically.
  • The filename matches your hostname (e.g., fluxnode-cumulus-01.zip).
  1. Review Bundle Contents

  • 🔑 Use operator_key when connecting:

    ssh -i operator_key operator@<node-ip>
  1. Store Keys Securely
    Move the private key into a safe location
  2. Finish SSH Setup
    After downloading and securing your keys, click Finish to apply SSH access and move on.