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Every simulated node has full SSH access, just like a real server.

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Default Credentials

FieldValue
Userroot
Passwordkombisim
Port Range30000-39999

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Connecting

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Find Your Node’s Port

Each node gets a unique SSH port: 
# List nodes with SSH ports
curl -s http://localhost:5270/api/v1/nodes | jq '.[] | {name, ssh_port}'
Output: 
{"name": "node-1", "ssh_port": 30001}
{"name": "node-2", "ssh_port": 30002}
{"name": "node-3", "ssh_port": 30003}

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Connect via SSH

ssh -p 30001 root@localhost
# Password: kombisim
Add to ~/.ssh/config: 
Host sim-node-1
    HostName localhost
    Port 30001
    User root
    StrictHostKeyChecking no
    UserKnownHostsFile /dev/null

Host sim-node-2
    HostName localhost
    Port 30002
    User root
    StrictHostKeyChecking no
    UserKnownHostsFile /dev/null
Now connect with: 
ssh sim-node-1

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SSH Keys

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Using Your Own Key

# Copy your key to the node
ssh-copy-id -p 30001 root@localhost

# Or manually
cat ~/.ssh/id_rsa.pub | ssh -p 30001 root@localhost \
  "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys"

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Pre-provisioning Keys

When creating a node, include your public key: 
curl -X POST http://localhost:5270/api/v1/nodes \
  -H "Content-Type: application/json" \
  -d '{
    "name": "secure-node",
    "os": "ubuntu-22.04",
    "ssh_keys": ["ssh-rsa AAAA... your-key"]
  }'

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File Transfer

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SCP

# Upload
scp -P 30001 local-file.txt root@localhost:/tmp/

# Download
scp -P 30001 root@localhost:/var/log/syslog ./

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rsync

rsync -avz -e "ssh -p 30001" ./myapp/ root@localhost:/opt/myapp/

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Port Forwarding

Access services inside nodes: 
# Forward node's port 80 to local 8080
ssh -p 30001 -L 8080:localhost:80 root@localhost
Now access http://localhost:8080 to reach the node’s web server.

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Troubleshooting

  1. Check the node is running: curl http://localhost:5270/api/v1/nodes
  2. Verify the port: node may be on different port
  3. Wait a few seconds after node creation
Sim nodes are ephemeral, so host keys change:
ssh-keygen -R "[localhost]:30001"