Day-11.md

Day 11: Introduction to Arista eAPI and GoeAPI Library

Introduction:

eAPI as a JSON-RPC based API. Understanding the request and response structure. Introducing goeapi, the official Go client library for Arista eAPI.

Installation:

mkdir Day11 && cd Day11
go mod init 
go mod init example.com/m
go get github.com/aristanetworks/goeapi

Code Example: Basic goeapi show version

// show_version.go
package main

import (
	"fmt"
	"os"

	"github.com/aristanetworks/goeapi"
)

func main() {

	node, err := goeapi.Connect("http", "172.20.20.2", "admin", "admin", 80) 
	if err != nil {
		fmt.Printf("Error connecting to node: %v\n", err)
		os.Exit(1)
	}

	cmds := []string{"show version"}
	response, err := node.RunCommands(cmds, "text")
	if err != nil {
		fmt.Printf("Error running commands: %v\n", err)
		os.Exit(1)
	}

	// The response is a slice of maps (interface{} for dynamic JSON)
	// You'll typically unmarshal this into a specific struct for better handling
	fmt.Printf("Show Version Response: %+v\n", response)

	// For now, let's just print the raw response. Later we'll parse it.
}

Challenge 11:

Deploy a Containerlab topology with one cEOS device with eAPI enabled. Create the ~/.eapi.conf file with the correct IP and credentials. Run the show_version.go example and observe the raw JSON output.