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Import existing AWS Lambda functions

The fnctl tool includes a set of commands to act on Lambda functions. Most of these are described in getting-started. One more subcommand is aws-import.

If you have an existing AWS Lambda function, you can use this command to automatically convert it to a Docker image that is ready to be deployed on other platforms.

Credentials

To use this, either have your AWS access key and secret key set in config files, or in environment variables. In addition, you'll want to set a default region. You can use the aws tool to set this up. Full instructions are in the AWS documentation.

Importing

The aws-import command is constructed as follows:

fnctl lambda aws-import <arn> <region> <image>
  • arn: describes the ARN formats which uniquely identify the AWS lambda resource
  • region: region on which the lambda is hosted
  • image: the name of the created docker image which should have the format /

Assuming you have a lambda with the following arn arn:aws:lambda:us-west-2:123141564251:function:my-function, the following command:

fnctl lambda aws-import arn:aws:lambda:us-west-2:123141564251:function:my-function us-east-1 user/my-function

will import the function code from the region us-east-1 to a directory called ./user/my-function. Inside the directory you will find the function.yml, Dockerfile, and all the files needed for running the function.

Using Lambda with Docker Hub and IronFunctions requires that the Docker image be named <Docker Hub username>/<image name>. This is used to uniquely identify images on Docker Hub. Please use the <Docker Hub username>/<image name> as the image name with aws-import to create a correctly named image.

If you only want to download the code, pass the --download-only flag. The --profile flag is available similar to the aws tool to help you tweak the settings on a command level. Finally, you can import a different version of your lambda function than the latest one by passing --version <version>.

You can then publish the imported lambda as follows:

./fnctl publish -d ./user/my-function

Now the function can be reached via http://$HOSTNAME/r/user/my-function