deploy zip to aws lambda automatically

Question

I have zipped my source code using python and moved Zip file to S3 bucket. And how can I automatically deploy this zip file to my already existing Lambda function. could you please give an idea on this. Thanks in advance.

Answer 1

• first install serverless.

npm install -g serverless

• check this repo for examples. I am providing a simple python lambda function example. serverless examples
• You can reference your lambda function from the files and also create necessary roles and invoke permissions and mention your resources in serverless.yml.
• To deploy the cloud formation script simply use below command from the directory of serverless.yml file

serverless deploy

• To delete the resources you deployed simply use following command from serverless.yml file's directory.

serverless remove

• This saves you a lot of time than creating your resources through console.
• You can also see different examples of nodejs etc in that repo.

Answer 2

• You can setup S3 to trigger a different lambda function whenever a code is uploaded in the s3 bucket and configure this lambda function to upload that zip in s3 to your desired lambda function.
• If your usecase is you only have to do changes and update the code from bucket. You can use serverless instead of paying for another lambda function.
• Serverless uses cloudformation underlyingly.
• see this reference on how to setup a s3 trigger create s3 trigger . Write your logic using boto3 client in this triggered lambda to upload the code to other lambda.