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Day13.md

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Day 13 Setting up the Lab and First Connection**

Prerequisites:

  • Linux Environment: A Linux machine (VM or bare metal) with Docker installed. Ubuntu 22.04 LTS or later is recommended.
  • Docker: Ensure Docker is installed and your user can run Docker commands without sudo. Refer to Docker's official documentation for installation.
  • Containerlab: Install Containerlab. The quick setup script curl -sL https://containerlab.dev/setup | sudo -E bash -s "all" is highly recommended.
  • Arista cEOS-lab Image: Download the Arista cEOS-lab image (a .tar.gz or .tar.xz file) from the Arista support portal. You'll need an Arista account to access this. Import the image into Docker: 
    docker import cEOS-lab-<VERSION>.tar.xz ceos:latest 
# Or specify the exact version, e.g., docker import cEOS-lab-4.30.6M.tar.xz ceos:4.30.6M
  • Python 3.9+: Ensure you have Python 3.9 or higher installed.
  • NAPALM: Install NAPALM: pip install napalm
  • Basic Python Knowledge: Familiarity with Python syntax, data structures (dictionaries, lists), and functions.

Tasks

Objective:

Get your Containerlab environment running with an Arista cEOS router and establish a basic NAPALM connection.

Concepts:

  • Containerlab topology definition (.clab.yml)
  • Arista cEOS basic configuration (eAPI, SSH)
  • NAPALM get_network_driver and open() method

Challenge:

Deploy a single cEOS router, configure its management interface, and verify SSH/eAPI access.

Code Examples:

  1. day1_topology.clab.yml:
name: arista-napalm-lab
topology:
  nodes:
    arista1:
      kind: ceos
      image: ceos:4.32.0F # Use the tag you imported your cEOS image with
      # You might need to add startup-config to enable eAPI and SSH, 
      # or configure it manually after the container starts.
      # For simplicity, we'll assume default cEOS enables SSH with admin/admin.
      # For eAPI, you might need to add:
      startup-config: |
        management api http-commands
          no shutdown
          protocol https port 443
          protocol http port 80
        username admin secret admin
  1. Deploy Containerlab lab:
sudo containerlab deploy -t day1_topology.clab.yml --reconfigure
  • Note: Containerlab automatically assigns IP addresses to the management interface (eth0) of cEOS containers within its clab Docker network. You'll need to find this IP.
  • To find the IP: docker inspect -f '{{ .NetworkSettings.Networks.clab.IPAddress }}' clab-arista-napalm-lab-arista1 (replace clab-arista-napalm-lab-arista1 with your container's full name if it's different).
  1. day1_connect.py:
from napalm import get_network_driver
import json

# Replace with the actual IP address of your arista1 cEOS container
# You can get this by running: 
# docker inspect -f '{{ .NetworkSettings.Networks.clab.IPAddress }}' clab-arista-napalm-lab-arista1
DEVICE_IP = "YOUR_ARISTA1_IP" 
USERNAME = "admin"
PASSWORD = "admin" # Default password for cEOS lab

# Arista EOS uses 'eos' driver
driver = get_network_driver("eos")
device = driver(
    hostname=DEVICE_IP,
    username=USERNAME,
    password=PASSWORD,
    optional_args={"secret": PASSWORD} # Required for Arista eAPI
)

print(f"Connecting to device {DEVICE_IP}...")
try:
    device.open()
    print("Connection successful!")

    # Example: Get device facts
    facts = device.get_facts()
    print("\n--- Device Facts ---")
    print(json.dumps(facts, indent=2))

except Exception as e:
    print(f"Error connecting or retrieving facts: {e}")
finally:
    if device.is_alive():
        device.close()
        print("Connection closed.")