Import existing AWS Lambda functions

The ironcli 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

Assuming you have a lambda function named my-function, the following command:

ironcli lambda aws-import my-function

will import the function code to a directory called ./my-function. It will then create a docker image called my-function.

Using Lambda with Docker Hub and Iron Worker 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 -image <Docker Hub username>/<image name> flag to aws-import to create a correctly named image.

If you only want to download the code, pass the -download-only flag. The -region and -profile flags are available similar to the aws tool to help you tweak the settings on a command level. If you want to call the docker image something other than my-function, pass the -image <new name> flag. Finally, you can import a different version of your lambda function than the latest one by passing -version <version>.