Day-06.md

Day 6: Introduction to Containerlab

Introduction:

• What is Containerlab?
• Why use it for network labs?
• Basic topology definition (YAML). Deploying and destroying labs.

Pre-requisite:

Ensure Docker is installed and arista/ceos image is imported.

Code Example Nokia (Containerlab Topology):

# srl_single.clab.yaml
name: srl-single
topology:
  nodes:
    srl1:
      kind: srl
      image: ghcr.io/nokia/srlinux # Use an appropriate SR Linux image version
      startup-config: |
        system {
            name {
            host-name srl1
            }
        }
      ports:
      - 57400:57400 # gNMI/gRPC
      - 830:830 # NETCONF over SSH
      - 22:22 # SSH

Instructions:

1. Save the YAML as srl_single.clab.yaml.
2. Deploy the lab: sudo containerlab deploy -t srl_single.clab.yaml.
3. Access the CLI: docker exec -it clab-srl-single-srl1 sr_cli.
4. Check status: show system information.
5. Destroy the lab when done: sudo containerlab destroy -t srl_single.clab.yaml.

Code Example Arista: Simple Containerlab Topology (YAML)

• Create simple_lab.clab.yaml:

name: simple-arista-lab
topology:
  nodes:
    ceos1:
      kind: arista_ceos
      image: ceos:4.34.0F # e.g., ceos:4.30.6M
    ceos2:
      kind: arista_ceos
      image: ceos:4.34.0F
  links:
    - endpoints: ["ceos1:eth1", "ceos2:eth1"]

• Deploy: sudo containerlab deploy -t simple_lab.clab.yaml --reconfigure
• Destroy: sudo containerlab destroy -t simple_lab.clab.yaml --cleanup

Challenge 6:

Deploy the simple_lab.yaml. Use sudo containerlab graph -t simple_lab.clab.yaml to visualize the lab. Log into ceos1 via docker exec -it clab-simple-arista-lab-ceos1 Cli and verify interfaces. Then destroy the lab.