Lambda whois Layer

Adds support for the whois (jwhois) tool to your Lambda function.

Installation

• Going to your AWS console
• Navigate to Lambda > Layers > Create layer
• Upload this zip and use the ARN in your Lambda function

---

TLD Conf

It may be helpful to bundle a jwhois.conf file with your Lambda function, to enable you to each adjust which data provider is used for each TLD. You can download an example here.

To use the conf file: whois -c backend/conf/jwhois.conf (note that the path is from the Lambda function root).

---

Building a new version

Please see the (AWS guide to create a deployment package](https://aws.amazon.com/premiumsupport/knowledge-center/lambda-linux-binary-package/). The following steps are tailored to whois.

1. Launch an Amazon EC2 instance from the latest Amazon Linux AMI
2. Connect to the instance, and then install tools to extract the packages:
   • sudo yum install -y jwhois rpmdevtools
3. Download and extract the libraries and the dependencies:
   • cd /tmp
   • yumdownloader jwhois.x86_64
   • rpmdev-extract *rpm
4. Copy the libraries into a directory for the Lambda deployment package:
   • sudo mkdir -p /var/task
   • sudo chown ec2-user:ec2-user /var/task
   • cd /var/task
   • /bin/cp /tmp/jwhois-4.0-19.7.amzn1.x86_64/usr/* /var/task -R (note: replace jwhois-4.0-19.7.amzn1.x86_64 with the respective directory name)
5. Copy all dependencies into the Lambda deployment package:
   • mkdir /var/task/lib
   • Get a list of all dependencies - ldd /usr/bin/jwhois
   • Copy each of the listed dependencies into your deployment package lib folder: eg. sudo /bin/cp /lib64/libidn.so.11 /var/task/lib/libidn.so.11
6. Create a deployment package ZIP:
   • cd /var/task
   • zip -r9 /tmp/jwhois-layer.zip *
7. Download a copy of jwhois-layer.zip (eg. via SFTP) and upload as a new layer in your Lambda console