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IAM Role
- First, you need to Create an IAM Role for Amazon EC2 and attach the AWS managed permissions "AWSLambdaFullAccess" and "AmazonS3FullAccess".
- You will need this role to interact with AWS services using the AWS CLI later on in this post.
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EC2 Instance
- Next, Launch an Amazon EC2 Instance with Amazon Linux 2 AMI from AWS Lambda Runtimes and attach the recently created IAM Role to the instance [https://docs.aws.amazon.com/quickstarts/latest/vmlaunch/step-1-launch-instance.html].
- If you already have an Amazon EC2 instance you can Attach the IAM Role to the existing Instance.
- The reason for using Amazon Linux 2 is that it comes with Python 3.7 available in the repositories.
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Now you can connect to your Linux Instance using an SSH Client and start building the AWS Lambda Layer.
a. Install and configure the AWS CLI [https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2-linux.html].
b. Update the existing system packages and install Python 3.7
$ sudo yum update -y $ sudo yum install python3 -y
c. Create a working directory and structure it by creating the "python" and "lib" folders which are required for a Python Layer.
$ mkdir ~/my_layer $ cd ~/my_layer $ mkdir python/ lib/
d. Install the "cx_Oracle" module using "pip-3.7" under "python/" directory. The function code will access it without additional configuration.
$ pip-3.7 install cx_Oracle -t python/
e. Download the latest version of "Oracle Client" libraries and extract the contents to the "lib/" directory [https://www.oracle.com/database/technologies/instant-client/linux-x86-64-downloads.html]
$ wget https://download.oracle.com/otn_software/linux/instantclient/193000/instantclient-basic-linux.x64-19.3.0.0.0dbru.zip -O oracle.zip $ unzip -j oracle.zip -d lib/
f. Install the "libaio" library and copy it to the "lib/" folder of the layer. This library is preinstalled in Amazon Linux 2, if you are using it ycan skip the installation.
$ (optional) sudo yum install libaio -y $ cp /lib64/libaio.so.1 lib/libaio.so.1
g. Create a ZIP archive with "python/" and "lib/" folders.
$ zip -r -y layer.zip python/ lib/
h. Copy the local archive to an Amazon S3 bucket. Make sure the bucket exists first. I created a bucket called awsexamplebucket.
$ aws s3 cp layer.zip s3://awsexamplebucket/layer.zip --region us-west-2
i. Create an AWS Lambda Layer using the uploaded archive as the source [https://docs.aws.amazon.com/cli/latest/reference/lambda/publish-layer-version.html].
$ aws lambda publish-layer-version --layer-name cx_Oracle --description "My cx_Oracle layer" --content S3Bucket=awsexamplebucket,S3Key=layer.zipcompatible-runtimes python3.7 --region us-west-2
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