eve-ng-emulator

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Automate EVE-NG network emulation lab creation, management, and topology deployment using evengsdk Python library and CLI. Use when you need to (1) Create or manage EVE-NG virtual network labs programmatically, (2) Deploy network topologies from YAML definitions, (3) Configure virtual network devices with templates or files, (4) Build automated test environments for network validation, (5) Manage nodes, networks, and links in EVE-NG labs, (6) Integrate network lab provisioning into CI/CD pipelines

nkxy007 By nkxy007 schedule Updated 3/15/2026
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name: eve-ng-emulator description: Automate EVE-NG network emulation lab creation, management, and topology deployment using evengsdk Python library and CLI. Use when you need to (1) Create or manage EVE-NG virtual network labs programmatically, (2) Deploy network topologies from YAML definitions, (3) Configure virtual network devices with templates or files, (4) Build automated test environments for network validation, (5) Manage nodes, networks, and links in EVE-NG labs, (6) Integrate network lab provisioning into CI/CD pipelines license: Apache-2.0 metadata: author: eve-ng-skill version: "1.0" requires: evengsdk, Python 3.8+, EVE-NG instance

EVE-NG Emulator Skill

Overview

EVE-NG (Emulated Virtual Environment - Next Generation) is a powerful network emulation platform that allows you to create virtual network labs with routers, switches, firewalls, and other network devices. This skill enables you to programmatically manage EVE-NG labs using the evengsdk Python library and CLI tools.

What this skill provides:

  • Automated lab creation and management
  • Programmatic topology deployment
  • Device configuration automation
  • Integration with network automation workflows
  • YAML-based declarative topology definitions

Prerequisites:

  • EVE-NG instance (Community or Professional edition)
  • Python 3.8 or higher
  • Network access to EVE-NG API
  • Valid EVE-NG credentials

When to Use This Skill

Use this skill when you need to:

  • Automated Testing: Create reproducible network labs for testing automation scripts
  • CI/CD Integration: Deploy test topologies as part of continuous integration pipelines
  • Training Labs: Quickly provision training environments with consistent configurations
  • Network Design Validation: Test network designs before physical deployment
  • Rapid Prototyping: Experiment with network architectures and protocols
  • Documentation: Generate lab topologies from infrastructure-as-code definitions

Installation & Setup

Install evengsdk

# Install the library
pip install eve-ng

# Verify installation
eve-ng --help

Configure Environment Variables

Create a .env file or export variables:

export EVE_NG_HOST=192.168.1.100
export EVE_NG_USERNAME=admin
export EVE_NG_PASSWORD=eve
export EVE_NG_PORT=80
export EVE_NG_PROTOCOL=http
export EVE_NG_SSL_VERIFY=False
export EVE_NG_LAB_PATH='/mylab.unl'

Test Connectivity

from evengsdk.client import EvengClient

# Create client
client = EvengClient("192.168.1.100", log_file="eve.log", ssl_verify=False)

# Disable SSL warnings for self-signed certificates
client.disable_insecure_warnings()

# Login
client.login(username="admin", password="eve")

# Test API access
templates = client.api.list_node_templates()
print(f"Available templates: {len(templates['data'])}")

# Logout
client.logout()

Core Concepts

Labs

  • Container for network topology
  • Path: Directory-like structure (e.g., /, /projects/)
  • File format: .unl extension
  • Contains nodes, networks, and links

Nodes

  • Virtual devices: Routers, switches, firewalls, servers
  • Templates: Pre-configured device types (vEOS, CSR1000v, vIOS, etc.)
  • Properties: Name, template, image, position, configuration
  • States: Stopped, started, configured

Networks

  • Connection points for nodes
  • Types:
    • pnet0-9: Bridge to physical networks (management)
    • bridge: Internal network segments
  • Visibility: Controls display in topology

Links

  • Connections between nodes or nodes-to-networks
  • Types:
    • Node-to-cloud: Management connections
    • Node-to-node: Point-to-point links
  • Labels: Interface names (e.g., Gi0/0, Eth1)

Templates

  • Device definitions available in EVE-NG
  • Examples: veos, viosl2, csr1000v, nxosv9k
  • Images: Specific versions (e.g., veos-4.22.0F)

Basic Operations

1. Lab Management

Create a Lab

from evengsdk.client import EvengClient

client = EvengClient("192.168.1.100", ssl_verify=False)
client.login(username="admin", password="eve")

# Define lab
lab = {
    "name": "my_network_lab",
    "description": "Test Lab for Automation",
    "path": "/"
}

# Create lab
response = client.api.create_lab(**lab)
if response['status'] == "success":
    print(f"Lab created: {lab['name']}")
    lab_path = f"{lab['path']}{lab['name']}.unl"
else:
    print(f"Error: {response.get('message')}")

client.logout()

List Labs

# List all labs
labs = client.api.list_labs()
for lab in labs['data']:
    print(f"Lab: {lab['name']} - Path: {lab['path']}")

Delete a Lab

# Delete lab
lab_path = "/my_network_lab.unl"
response = client.api.delete_lab(lab_path)

2. Node Management

Add Nodes to Lab

lab_path = "/my_network_lab.unl"

# Define nodes
nodes = [
    {
        "name": "spine01",
        "template": "veos",
        "image": "veos-4.22.0F",
        "left": 100,
        "top": 100
    },
    {
        "name": "leaf01",
        "template": "veos",
        "image": "veos-4.22.0F",
        "left": 50,
        "top": 300
    },
    {
        "name": "leaf02",
        "template": "veos",
        "image": "veos-4.22.0F",
        "left": 200,
        "top": 300
    }
]

# Add nodes to lab
for node in nodes:
    response = client.api.add_node(lab_path, **node)
    print(f"Added node: {node['name']}")

List Available Templates

# Get all available node templates
templates = client.api.list_node_templates()
for template_name, template_desc in templates['data'].items():
    print(f"{template_name}: {template_desc}")

Start/Stop Nodes

# Start all nodes in lab
client.api.start_all_nodes(lab_path)

# Stop all nodes
client.api.stop_all_nodes(lab_path)

# Start specific node
node_id = 1
client.api.start_node(lab_path, node_id)

3. Network Management

Create Management Network

lab_path = "/my_network_lab.unl"

# Create management cloud (bridge to physical network)
mgmt_cloud = {
    "name": "mgmt-network",
    "network_type": "pnet1",  # Physical network bridge
    "visibility": 1
}

response = client.api.add_lab_network(lab_path, **mgmt_cloud)
print(f"Created network: {mgmt_cloud['name']}")

Create Internal Networks

# Create internal network segments
internal_net = {
    "name": "internal-net",
    "network_type": "bridge",
    "visibility": 1
}

client.api.add_lab_network(lab_path, **internal_net)

4. Link Management

Connect Nodes to Management Network

lab_path = "/my_network_lab.unl"

# Connect nodes to management cloud
mgmt_connections = [
    {"src": "spine01", "src_label": "Management1", "dst": "mgmt-network"},
    {"src": "leaf01", "src_label": "Management1", "dst": "mgmt-network"},
    {"src": "leaf02", "src_label": "Management1", "dst": "mgmt-network"}
]

for link in mgmt_connections:
    client.api.connect_node_to_cloud(lab_path, **link)
    print(f"Connected {link['src']} to {link['dst']}")

Create Point-to-Point Links

# Create node-to-node connections
p2p_links = [
    {"src": "spine01", "src_label": "Ethernet1", "dst": "leaf01", "dst_label": "Ethernet1"},
    {"src": "spine01", "src_label": "Ethernet2", "dst": "leaf02", "dst_label": "Ethernet1"}
]

for link in p2p_links:
    client.api.connect_node_to_node(lab_path, **link)
    print(f"Connected {link['src']}:{link['src_label']} to {link['dst']}:{link['dst_label']}")

5. Configuration Deployment

Using Configuration Files

# Deploy configuration from file
node_config = {
    "name": "leaf01",
    "config_file": "/path/to/configs/leaf01.cfg"
}

# Configuration will be applied when node starts

Using Jinja2 Templates

# Deploy using Jinja2 template with variables
node_with_template = {
    "name": "leaf02",
    "template": "veos",
    "image": "veos-4.22.0F",
    "configuration": {
        "template": "base.j2",
        "vars": {
            "hostname": "leaf02",
            "management_ip": "10.0.0.2/24",
            "gateway": "10.0.0.1"
        }
    }
}

Example Jinja2 Template (base.j2):

hostname {{ hostname }}
!
interface Management1
   ip address {{ management_ip }}
   no shutdown
!
ip route 0.0.0.0/0 {{ gateway }}

Topology Builder (YAML-based)

The topology builder allows you to define entire labs declaratively using YAML files.

YAML Topology Format

---
name: leaf-spine-lab
description: 2-Spine 4-Leaf Topology
path: "/"

nodes:
  - name: spine01
    template: veos
    image: veos-4.22.0F
    node_type: qemu
    left: 200
    top: 100
    configuration:
      template: spine.j2
      vars:
        hostname: spine01
        router_id: 1.1.1.1
        asn: 65001

  - name: spine02
    template: veos
    image: veos-4.22.0F
    node_type: qemu
    left: 400
    top: 100
    configuration:
      template: spine.j2
      vars:
        hostname: spine02
        router_id: 1.1.1.2
        asn: 65001

  - name: leaf01
    template: veos
    image: veos-4.22.0F
    node_type: qemu
    left: 100
    top: 300
    configuration:
      file: configs/leaf01.cfg

  - name: leaf02
    template: veos
    image: veos-4.22.0F
    node_type: qemu
    left: 250
    top: 300

networks:
  - name: mgmt-cloud
    network_type: pnet1
    visibility: 1
    top: 50
    left: 500

links:
  network:
    - {src: "spine01", src_label: "Management1", dst: "mgmt-cloud"}
    - {src: "spine02", src_label: "Management1", dst: "mgmt-cloud"}
    - {src: "leaf01", src_label: "Management1", dst: "mgmt-cloud"}
    - {src: "leaf02", src_label: "Management1", dst: "mgmt-cloud"}
  
  node:
    - {src: "spine01", src_label: "Ethernet1", dst: "leaf01", dst_label: "Ethernet1"}
    - {src: "spine01", src_label: "Ethernet2", dst: "leaf02", dst_label: "Ethernet1"}
    - {src: "spine02", src_label: "Ethernet1", dst: "leaf01", dst_label: "Ethernet2"}
    - {src: "spine02", src_label: "Ethernet2", dst: "leaf02", dst_label: "Ethernet2"}

Deploy Topology from YAML

# Using CLI
eve-ng lab create-from-topology \
  -t topologies/leaf-spine-lab.yml \
  --template-dir templates/

# Using Python
from evengsdk.topology import TopologyBuilder

builder = TopologyBuilder(client)
builder.build_from_yaml("topologies/leaf-spine-lab.yml", template_dir="templates/")

CLI Usage Examples

Lab Commands

# List all labs
eve-ng --host $EVE_NG_HOST --username $EVE_NG_USERNAME --password $EVE_NG_PASSWORD lab list

# Create lab
eve-ng lab create --name test-lab --path /

# Delete lab
eve-ng lab delete --path /test-lab.unl

# Show lab details
eve-ng lab show --path /test-lab.unl

Node Commands

# List nodes in lab
eve-ng node list --lab-path /test-lab.unl

# Add node
eve-ng node add \
  --lab-path /test-lab.unl \
  --name router01 \
  --template vios \
  --image vios-15.6

# Start all nodes
eve-ng node start-all --lab-path /test-lab.unl

# Stop specific node
eve-ng node stop --lab-path /test-lab.unl --node-id 1

System Commands

# List available templates
eve-ng list-node-templates

# List network types
eve-ng list-network-types

# Show server status
eve-ng show-status

# Get template details
eve-ng show-template --template veos

Complete Example: Leaf-Spine Topology

from evengsdk.client import EvengClient

def create_leaf_spine_lab():
    # Initialize client
    client = EvengClient("192.168.1.100", ssl_verify=False, protocol="http")
    client.disable_insecure_warnings()
    client.login(username="admin", password="eve")
    client.set_log_level("INFO")
    
    # Create lab
    lab = {
        "name": "leaf_spine_lab",
        "description": "2-Spine 4-Leaf EVPN/VXLAN Lab",
        "path": "/"
    }
    
    resp = client.api.create_lab(**lab)
    if resp['status'] != "success":
        print(f"Error creating lab: {resp}")
        return
    
    lab_path = f"{lab['path']}{lab['name']}.unl"
    print(f"Created lab: {lab_path}")
    
    # Create management network
    mgmt_cloud = {"name": "mgmt", "network_type": "pnet1"}
    client.api.add_lab_network(lab_path, **mgmt_cloud)
    print("Created management network")
    
    # Define spine switches
    spines = [
        {"name": "spine01", "template": "veos", "image": "veos-4.22.0F", "left": 200, "top": 100},
        {"name": "spine02", "template": "veos", "image": "veos-4.22.0F", "left": 400, "top": 100}
    ]
    
    # Define leaf switches
    leaves = [
        {"name": "leaf01", "template": "veos", "image": "veos-4.22.0F", "left": 100, "top": 300},
        {"name": "leaf02", "template": "veos", "image": "veos-4.22.0F", "left": 250, "top": 300},
        {"name": "leaf03", "template": "veos", "image": "veos-4.22.0F", "left": 400, "top": 300},
        {"name": "leaf04", "template": "veos", "image": "veos-4.22.0F", "left": 550, "top": 300}
    ]
    
    # Add all nodes
    all_nodes = spines + leaves
    for node in all_nodes:
        client.api.add_node(lab_path, **node)
        print(f"Added node: {node['name']}")
    
    # Connect all nodes to management
    for node in all_nodes:
        link = {"src": node['name'], "src_label": "Management1", "dst": "mgmt"}
        client.api.connect_node_to_cloud(lab_path, **link)
    print("Connected all nodes to management network")
    
    # Create spine-to-leaf links (full mesh)
    for spine in spines:
        for idx, leaf in enumerate(leaves, start=1):
            link = {
                "src": spine['name'],
                "src_label": f"Ethernet{idx}",
                "dst": leaf['name'],
                "dst_label": f"Ethernet{spines.index(spine) + 1}"
            }
            client.api.connect_node_to_node(lab_path, **link)
            print(f"Connected {link['src']}:{link['src_label']} to {link['dst']}:{link['dst_label']}")
    
    print("\n✅ Lab creation complete!")
    print(f"Lab path: {lab_path}")
    print(f"Total nodes: {len(all_nodes)}")
    
    client.logout()

if __name__ == "__main__":
    create_leaf_spine_lab()

Common Patterns

Hub-and-Spoke Topology

def create_hub_spoke(client, lab_path):
    # Hub router
    hub = {"name": "hub-router", "template": "vios", "image": "vios-15.6", "left": 300, "top": 200}
    client.api.add_node(lab_path, **hub)
    
    # Spoke routers
    spokes = [
        {"name": f"spoke{i}", "template": "vios", "image": "vios-15.6", 
         "left": 100 + (i * 150), "top": 400}
        for i in range(1, 5)
    ]
    
    for spoke in spokes:
        client.api.add_node(lab_path, **spoke)
        
        # Connect spoke to hub
        link = {
            "src": "hub-router",
            "src_label": f"GigabitEthernet0/{spokes.index(spoke)}",
            "dst": spoke['name'],
            "dst_label": "GigabitEthernet0/0"
        }
        client.api.connect_node_to_node(lab_path, **link)

Full Mesh Topology

def create_full_mesh(client, lab_path, nodes):
    # Add all nodes
    for node in nodes:
        client.api.add_node(lab_path, **node)
    
    # Create full mesh connections
    interface_counter = {}
    for i, node1 in enumerate(nodes):
        interface_counter[node1['name']] = 0
        for node2 in nodes[i+1:]:
            link = {
                "src": node1['name'],
                "src_label": f"Ethernet{interface_counter[node1['name']]}",
                "dst": node2['name'],
                "dst_label": f"Ethernet{interface_counter.get(node2['name'], 0)}"
            }
            client.api.connect_node_to_node(lab_path, **link)
            interface_counter[node1['name']] += 1
            interface_counter[node2['name']] = interface_counter.get(node2['name'], 0) + 1

Troubleshooting

Connection Issues

Problem: Cannot connect to EVE-NG API

Solutions:

# Check connectivity
import requests
response = requests.get("http://192.168.1.100/api/status")
print(response.status_code)

# Verify credentials
client = EvengClient("192.168.1.100")
try:
    client.login(username="admin", password="eve")
    print("✅ Login successful")
except Exception as e:
    print(f"❌ Login failed: {e}")

Template Not Found

Problem: Error adding node - template not available

Solution:

# List available templates
templates = client.api.list_node_templates()
available = [t for t in templates['data'].keys() if 'missing' not in templates['data'][t]]
print(f"Available templates: {available}")

# Check specific template
template_name = "veos"
if template_name in available:
    print(f"✅ Template {template_name} is available")
else:
    print(f"❌ Template {template_name} not found")

Node Startup Failures

Problem: Nodes fail to start

Checks:

  1. Verify image is uploaded to EVE-NG
  2. Check EVE-NG server resources (CPU, RAM)
  3. Review node console for errors
  4. Verify template configuration
# Check EVE-NG server status
eve-ng show-status

# View node details
eve-ng node show --lab-path /test-lab.unl --node-id 1

Authentication Errors

Problem: 401 Unauthorized errors

Solutions:

# Ensure proper login
client.login(username="admin", password="eve")

# Check session is active
# Re-login if needed after long idle periods

# Use environment variables for credentials
import os
username = os.getenv("EVE_NG_USERNAME")
password = os.getenv("EVE_NG_PASSWORD")

Best Practices

Lab Organization

  1. Use descriptive names: leaf-spine-evpn not lab1
  2. Organize by path: Group related labs in folders
  3. Version control: Store YAML topologies in git
  4. Document purpose: Use clear descriptions

Naming Conventions

# Good naming
nodes = [
    {"name": "core-router-01", ...},
    {"name": "access-switch-floor2", ...},
    {"name": "fw-dmz-primary", ...}
]

# Avoid generic names
nodes = [
    {"name": "router1", ...},
    {"name": "switch", ...},
    {"name": "device", ...}
]

Resource Management

# Stop nodes when not in use
client.api.stop_all_nodes(lab_path)

# Delete unused labs
client.api.delete_lab("/old-lab.unl")

# Monitor EVE-NG resources
status = client.api.get_server_status()
print(f"CPU: {status['cpu']}%, RAM: {status['ram']}%")

Configuration Management

  1. Use templates: Jinja2 for dynamic configs
  2. Separate data: Keep variables in separate files
  3. Version control: Track configuration changes
  4. Validate configs: Test before deployment
# Good: Separate data from template
config = {
    "template": "base.j2",
    "vars": "data/leaf01.yml"  # External variable file
}

# Better: Use version-controlled configs
config = {
    "file": "configs/v2.0/leaf01.cfg"
}

Error Handling

def safe_lab_creation(client, lab_config):
    try:
        response = client.api.create_lab(**lab_config)
        if response['status'] == 'success':
            return response
        else:
            print(f"Lab creation failed: {response.get('message')}")
            return None
    except Exception as e:
        print(f"Error: {e}")
        return None

Limitations & Gotchas

EVE-NG Version Compatibility

  • evengsdk works with EVE-NG Community and Professional
  • API endpoints may vary between versions
  • Always test with your specific EVE-NG version

Resource Constraints

  • Each node consumes CPU and RAM
  • Monitor server resources before adding many nodes
  • Consider node startup time in automation

Template Availability

  • Templates must be installed on EVE-NG server
  • Image files must be uploaded separately
  • Template names are case-sensitive

Network Type Restrictions

  • pnet0-9: Limited to 10 physical network bridges
  • Network types depend on EVE-NG configuration
  • Some network types require specific permissions

API Rate Limiting

  • Avoid rapid API calls in loops
  • Use batch operations when possible
  • Implement retry logic for transient failures

Configuration Deployment

  • Configurations apply on node startup
  • Changes require node restart to take effect
  • Template rendering happens server-side

Integration Examples

CI/CD Pipeline Integration

# .gitlab-ci.yml example
test-network-automation:
  stage: test
  script:
    - pip install eve-ng ansible
    - eve-ng lab create-from-topology -t test-topology.yml
    - ansible-playbook -i eve-inventory.yml test-playbook.yml
    - eve-ng lab delete --path /test-topology.unl
  only:
    - merge_requests

Ansible Integration

# Ansible playbook to create EVE-NG lab
---
- name: Deploy EVE-NG Lab
  hosts: localhost
  tasks:
    - name: Create lab from topology
      command: >
        eve-ng lab create-from-topology
        -t {{ topology_file }}
        --template-dir {{ template_dir }}
      environment:
        EVE_NG_HOST: "{{ eve_host }}"
        EVE_NG_USERNAME: "{{ eve_user }}"
        EVE_NG_PASSWORD: "{{ eve_pass }}"

Python Automation Framework

class EVELabManager:
    def __init__(self, host, username, password):
        self.client = EvengClient(host, ssl_verify=False)
        self.client.login(username=username, password=password)
    
    def deploy_topology(self, yaml_file):
        """Deploy topology from YAML file"""
        # Implementation here
        pass
    
    def validate_connectivity(self, lab_path):
        """Validate all nodes are connected"""
        # Implementation here
        pass
    
    def cleanup(self, lab_path):
        """Stop and delete lab"""
        self.client.api.stop_all_nodes(lab_path)
        self.client.api.delete_lab(lab_path)
    
    def __enter__(self):
        return self
    
    def __exit__(self, exc_type, exc_val, exc_tb):
        self.client.logout()

# Usage
with EVELabManager("192.168.1.100", "admin", "eve") as manager:
    manager.deploy_topology("topology.yml")
    manager.validate_connectivity("/topology.unl")

Additional Resources

Quick Reference

Common Commands

# Lab operations
eve-ng lab list
eve-ng lab create --name <name> --path <path>
eve-ng lab delete --path <lab_path>

# Node operations
eve-ng node list --lab-path <lab_path>
eve-ng node start-all --lab-path <lab_path>
eve-ng node stop-all --lab-path <lab_path>

# System info
eve-ng list-node-templates
eve-ng show-status

Python Quick Start

from evengsdk.client import EvengClient

# Connect
client = EvengClient("host", ssl_verify=False)
client.login(username="admin", password="eve")

# Create lab
client.api.create_lab(name="lab", description="desc", path="/")

# Add node
client.api.add_node("/lab.unl", name="r1", template="vios", image="vios-15.6")

# Create link
client.api.connect_node_to_node("/lab.unl", src="r1", src_label="Gi0/0", 
                                  dst="r2", dst_label="Gi0/0")

# Cleanup
client.logout()
Install via CLI
npx skills add https://github.com/nkxy007/workerxy --skill eve-ng-emulator
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