Using AWS CLI Cmd How To Get Only Loadbalancer 443 Listener ID ARN?

Mar 12, 2025 by ADMIN 68 views

**Using AWS CLI cmd to Get Only Load Balancer 443 Listener ID ARN**

Introduction

Amazon Web Services (AWS) provides a comprehensive set of tools and services for managing and scaling applications. One of the key services offered by AWS is the Elastic Load Balancer (ELB), which helps distribute traffic across multiple instances of an application. In this article, we will explore how to use the AWS Command Line Interface (CLI) to retrieve the Listener ID and ARN of a Load Balancer that is listening on port 443.

Prerequisites

Before we dive into the AWS CLI commands, make sure you have the following:

An AWS account with the necessary permissions to access the Load Balancer.
The AWS CLI installed and configured on your machine.
The AWS CLI version 2 or later.

Understanding Load Balancer Listeners

A Load Balancer can have multiple listeners, each of which can be configured to listen on a specific port and protocol (e.g., HTTP, HTTPS, TCP). In this case, we are interested in retrieving the Listener ID and ARN of a Load Balancer that is listening on port 443 (HTTPS).

Using AWS CLI to Get Load Balancer Listeners

To retrieve the Listeners of a Load Balancer, you can use the following AWS CLI command:

aws elbv2 describe-listeners --load-balancer-arn <load-balancer-arn>

Replace <load-balancer-arn> with the ARN of the Load Balancer you are interested in.

Filtering Listeners by Port

To filter the Listeners by port, you can use the --query option with the describe-listeners command. For example, to retrieve only the Listeners that are listening on port 443, you can use the following command:

aws elbv2 describe-listeners --load-balancer-arn <load-balancer-arn> --query 'Listeners[?Protocol == `HTTPS` && Port == 443].ListenerArn'

This command will return the ARN of the Listener that is listening on port 443.

Getting the Listener ID

To get the Listener ID, you can use the describe-listeners command with the --query option. For example:

aws elbv2 describe-listeners --load-balancer-arn <load-balancer-arn> --query 'Listeners[?Protocol == `HTTPS` && Port == 443].ListenerArn | [0]'

This command will return the Listener ID of the Listener that is listening on port 443.

Example Use Case

Let's say you have a Load Balancer with the ARN arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-lb/123456789012. You want to retrieve the Listener ID and ARN of the Listener that is listening on port 443. You can use the following commands:

aws elbv2 describe-listeners --load-balancer-arn arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-lb/123456789012
aws elbv2 describe-listeners --load-balancer-arn arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-lb/123456789012 --query 'Listeners[?Protocol == `HTTPS` && Port == 443].ListenerArn'
aws elbv2 describe-listeners --load-balancer-arn arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-lb/123456789012 --query 'Listeners[?Protocol == `HTTPS` && Port == 443].ListenerArn | [0]'

These commands will return the Listeners of the Load Balancer, the ARN of the Listener that is listening on port 443, and the Listener ID of the Listener that is listening on port 443, respectively.

Conclusion

Introduction

In our previous article, we explored how to use the AWS Command Line Interface (CLI) to retrieve the Listener ID and ARN of a Load Balancer that is listening on port 443. In this article, we will answer some frequently asked questions (FAQs) related to this topic.

Q: What is the difference between a Load Balancer and a Listener?

A: A Load Balancer is a resource that distributes traffic across multiple instances of an application. A Listener, on the other hand, is a component of a Load Balancer that listens on a specific port and protocol (e.g., HTTP, HTTPS, TCP).

Q: How do I get the ARN of a Load Balancer using the AWS CLI?

A: You can use the describe-load-balancers command with the --query option to get the ARN of a Load Balancer. For example:

aws elbv2 describe-load-balancers --query 'LoadBalancers[0].LoadBalancerArn'

This command will return the ARN of the first Load Balancer in the list.

Q: How do I filter Listeners by port using the AWS CLI?

A: You can use the --query option with the describe-listeners command to filter Listeners by port. For example, to retrieve only the Listeners that are listening on port 443, you can use the following command:

aws elbv2 describe-listeners --load-balancer-arn <load-balancer-arn> --query 'Listeners[?Protocol == `HTTPS` && Port == 443].ListenerArn'

This command will return the ARN of the Listener that is listening on port 443.

Q: How do I get the Listener ID using the AWS CLI?

A: You can use the describe-listeners command with the --query option to get the Listener ID. For example:

aws elbv2 describe-listeners --load-balancer-arn <load-balancer-arn> --query 'Listeners[?Protocol == `HTTPS` && Port == 443].ListenerArn | [0]'

This command will return the Listener ID of the Listener that is listening on port 443.

Q: What if I have multiple Listeners listening on port 443?

A: If you have multiple Listeners listening on port 443, the describe-listeners command will return a list of Listeners. You can use the --query option to filter the Listeners by protocol and port. For example:

aws elbv2 describe-listeners --load-balancer-arn <load-balancer-arn> --query 'Listeners[?Protocol == `HTTPS` && Port == 443]'

This command will return a list of Listeners that are listening on port 443 and using the HTTPS protocol.

Q: Can I use the AWS CLI to update a Listener?

A: Yes, you can use the update-listener command to update a Listener. For example:

aws elbv2 update-listener --listener-arn <listener-arn> --protocol HTTPS --port 443

This command will update the Listener with the specified ARN to use the HTTPS protocol and listen on port 443.

Conclusion

In this article, we answered some frequently asked questions related to using the AWS CLI to retrieve the Listener ID and ARN of a Load Balancer that is listening on port 443. We covered topics such as the difference between a Load Balancer and a Listener, getting the ARN of a Load Balancer, filtering Listeners by port, getting the Listener ID, and updating a Listener. By following these steps, you can easily manage your Load Balancers and Listeners using the AWS CLI.