Deploying Lambda Functions as Container Images

Correct Answer: D.

Option A is incorrect because there is no need to assume the IAM role in the Dockerfile.

Users should configure the IAM role when creating the Lambda function.

Option B is incorrect because Lambda automatically forwards logs to CloudWatch Logs.

Users do not need to install the CloudWatch agent in Dockerfile.

Option C is incorrect because after the Docker image has been built, users should push the image to ECR.

There is no ECR agent that needs to be installed in the Docker image.

Option D is CORRECT because the container image for Lambda must implement the Lambda Runtime API that is added by the open-source runtime interface client.

References:

https://aws.amazon.com/blogs/aws/new-for-aws-lambda-container-image-support/ https://docs.aws.amazon.com/lambda/latest/dg/images-create.html

To package and deploy a Lambda function as a container image, you will need to follow the steps below:

1. Create a Dockerfile: A Dockerfile is a script that contains a set of instructions for building a Docker image. In this case, you will need to start with the python:buster image and add any dependencies or libraries that your Lambda function requires. You can use any package manager such as pip, conda or apt-get to install the dependencies.

2. Build the Docker image: Once you have created the Dockerfile, you can use it to build a Docker image using the "docker build" command. This will create a Docker image that contains your Lambda function code and all its dependencies.

3. Push the Docker image to a container registry: To use the Docker image for your Lambda function, you will need to push it to a container registry such as Amazon Elastic Container Registry (ECR). This will allow Lambda to fetch the image and create a container from it.

Now, let's review the answer options to determine which is required:

A. In the Dockerfile, assume the IAM role through the “aws sts assume-role” CLI for the Lambda function during runtime. This is not required to package and deploy the Lambda function as a container image. Assuming the IAM role through the “aws sts assume-role” CLI is required if the Lambda function needs to access AWS resources, but it does not apply to building and deploying the container image.

B. Install the CloudWatch Log agent in the container image for the Lambda function to forward its logs to a CloudWatch Log group. This is not required to package and deploy the Lambda function as a container image. The CloudWatch Log agent is used to forward logs from the container to CloudWatch Logs, but it is not necessary for building and deploying the container image.

C. Install the Amazon Elastic Container Registry (Amazon ECR) agent for the Lambda function to interact with ECR to fetch the Docker image. This is not required because Amazon ECR is a container registry service that manages Docker images and makes them available to services like Lambda. Lambda can fetch the Docker image directly from Amazon ECR without any additional agent.

D. Install the runtime interface client in the container image to make it compatible with Lambda. This is the correct answer. The runtime interface client is a piece of software that provides the interface between the Lambda service and the container. When Lambda creates a container from the Docker image, it will use the runtime interface client to communicate with the container and invoke the Lambda function code.

Therefore, the action required to use the container image properly for the Lambda function is to install the runtime interface client in the container image to make it compatible with Lambda.