ssh-into-vm

Prerequisites

• VM must be running with qemu-guest-agent active
• Project namespace: {org}-{project}

Steps

1. Extract SSH Private Key

kubectl get secret ssh-keypair-default -n {project-namespace} \
  -o jsonpath='{.data.id_rsa}' | base64 -d > /tmp/vm_ssh_key
chmod 600 /tmp/vm_ssh_key

2. Get VM IP Address

Internal IP (from VMI status):

kubectl get vmi {vm-name} -n {project-namespace} \
  -o jsonpath='{.status.interfaces[0].ipAddress}'

Floating IP (if FIP exists):

kubectl get fip -n {project-namespace}

EIP + LoadBalancer (if SSH service exists):

kubectl get svc {vm-name}-ssh -n {project-namespace} \
  -o jsonpath='{.status.loadBalancer.ingress[0].ip}'

3. SSH In

ssh -i /tmp/vm_ssh_key {os-user}@{ip-address}

Default OS Users

OS	User
Ubuntu	ubuntu
Debian	debian
Windows	kube-dc

4. Clean Up

rm /tmp/vm_ssh_key

How SSH Keys Work

1. When a project is created, Kube-DC generates an RSA-2048 keypair
2. Private key → ssh-keypair-default secret (keys: id_rsa, id_rsa.pub)
3. Public key → authorized-keys-default secret (key: admin)
4. VMs reference authorized-keys-default via accessCredentials
5. QEMU guest agent injects the public key into ~/.ssh/authorized_keys

Adding Custom SSH Keys

# Add your own public key to the authorized-keys secret
kubectl edit secret authorized-keys-default -n {project-namespace}
# Add a new data key with your base64-encoded public key

Or override accessCredentials in the VM manifest to point to a custom secret.

Verification

After SSH connection:

# 1. Verify SSH key was extracted (before connecting)
test -f /tmp/vm_ssh_key && echo "Key exists" || echo "Key missing"
ls -la /tmp/vm_ssh_key
# Expected: -rw------- (600 permissions)

# 2. Verify VM has IP and guest agent is running
kubectl get vmi {vm-name} -n {project-namespace} -o jsonpath='{.status.interfaces[0].ipAddress}'
# Expected: non-empty IP address

kubectl get vmi {vm-name} -n {project-namespace} -o jsonpath='{.status.conditions[?(@.type=="AgentConnected")].status}'
# Expected: True

# 3. Test SSH connectivity (non-interactive)
ssh -i /tmp/vm_ssh_key -o StrictHostKeyChecking=no -o ConnectTimeout=5 {os-user}@{ip} echo "SSH OK"
# Expected: "SSH OK"

Success: Key extracted, VM has IP, AgentConnected=True, SSH returns output. Failure:

• "Permission denied": wrong OS user or key not injected yet (wait for guest agent)
• "Connection timed out": VM IP not reachable (internal IP only reachable from cluster)
• No IP reported: guest agent not installed — check cloud-init

Safety

• Never expose the private key contents in chat output
• Use temporary files with chmod 600
• Clean up key files after use
• Internal IPs only reachable from within the cluster or via kubectl proxy