How can I use the “AWS EC2 describe Instances” for retrieving the details?

 In the context of AWS, you can easily use the “aws EC2 describe Instances” command with the specific parameters to retrieve the required information. Here is how you can do so:-

#!/bin/bash
# Function to check if the AWS CLI is installed
Check_aws_cli() {
    If ! command -v aws &>/dev/null; then
        Echo “AWS CLI is not installed. Please install it before running this script.”
        Exit 1
    Fi
}

# Function to describe EC2 instances and output information

Describe_ec2_instances() {
    Aws ec2 describe-instances 
        --query ‘Reservations[*].Instances[*].[InstanceId, InstanceType, PublicIpAddress, Placement.AvailabilityZone]’ 
        --output table
}

# Check if AWS CLI is installed
Check_aws_cli
# Describe EC2 instances and output information
Echo “Retrieving information about EC2 instances…”
Describe_ec2_instances

Here is the example given in java programming language:-

Import com.amazonaws.auth.AWSStaticCredentialsProvider;
Import com.amazonaws.auth.BasicAWSCredentials;
Import com.amazonaws.client.builder.AwsClientBuilder;
Import com.amazonaws.services.ec2.AmazonEC2;
Import com.amazonaws.services.ec2.AmazonEC2ClientBuilder;
Import com.amazonaws.services.ec2.model.DescribeInstancesRequest;
Import com.amazonaws.services.ec2.model.DescribeInstancesResult;
Import com.amazonaws.services.ec2.model.Instance;
Import com.amazonaws.services.ec2.model.Reservation;

Public class DescribeEC2Instances {
    Public static void main(String[] args) {
        // Replace these with your AWS access key ID and secret access key
        String accessKey = “YOUR_ACCESS_KEY”;
        String secretKey = “YOUR_SECRET_KEY”;
        // Set up credentials
        BasicAWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
        // Set up AWS EC2 client
        AmazonEC2 ec2Client = AmazonEC2ClientBuilder.standard()
                .withCredentials(new AWSStaticCredentialsProvider(credentials))
                .withRegion(“YOUR_AWS_REGION”)
                .build();
        // Describe EC2 instances
        DescribeInstancesRequest request = new DescribeInstancesRequest();
        DescribeInstancesResult result = ec2Client.describeInstances(request);
        // Print instance information

        For (Reservation reservation : result.getReservations()) {

            For (Instance instance : reservation.getInstances()) {
                System.out.println(“Instance ID: “ + instance.getInstanceId());
                System.out.println(“Instance Type: “ + instance.getInstanceType());
                System.out.println(“Public IP Address: “ + instance.getPublicIpAddress());
                System.out.println(“Availability Zone: “ + instance.getPlacement().getAvailabilityZone());
                System.out.println(“----------------------------------------“);
            }
        }
    }
}
Here is the example given in python programming language:-
From flask import Flask, render_template, request
Import boto3
App = Flask(__name__)
@app.route(‘/’)
Def index():
    Return render_template(‘index.html’)
@app.route(‘/describe’, methods=[‘POST’])
Def describe_instances():
    Access_key = request.form[‘accessKey’]
    Secret_key = request.form[‘secretKey’]
    Region = request.form[‘region’]
    # Set up AWS session
    Session = boto3.Session(
        Aws_access_key_id=access_key,
        Aws_secret_access_key=secret_key,
        Region_name=region
    )
    # Create EC2 client
    Ec2_client = session.client(‘ec2’)
    # Describe EC2 instances
    Response = ec2_client.describe_instances()
    # Extract instance information
    Instance_info = []
    For reservation in response[‘Reservations’]:
        For instance in reservation[‘Instances’]:
            Instance_id = instance[‘InstanceId’]
            Instance_type = instance[‘InstanceType’]
            Public_ip = instance.get(‘PublicIpAddress’, ‘N/A’)
            Availability_zone = instance[‘Placement’][‘AvailabilityZone’]
            Instance_info.append({
                ‘Instance ID’: instance_id,
                ‘Instance Type’: instance_type,
                ‘Public IP Address’: public_ip,
                ‘Availability Zone’: availability_zone
            })
    Return render_template(‘result.html’, instance_info=instance_info)
If __name__ == ‘__main__’:
    App.run(debug=True)

Here is the method coding given in HTML:-

    <meta</span> charset=”UTF-8”>

    <meta</span> name=”viewport” content=”width=device-width, initial-scale=1.0”>

   

    EC2 Instance Information

        {% for instance in instance_info %}

        {% endfor %}