aws-lambda-layers-example's Introduction

AWS Layers Walk-through

Docs: https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html

Aim: Make a lambda whose job is to just call code from the layer

brew bundle
yarn install
cd layer; yarn install; cd ..

Set up the Peril aws cli env (make sure to set the region)

aws configure --profile peril

AWS Access Key ID [****************L7UA]:
AWS Secret Access Key [****************HH9A]:
Default region name [us-east-1]:
Default output format [json]:

Make and bundle app code

touch index.js
# edit it
rm dist/function.zip; cd app; zip ../dist/function.zip index.js; cd ..

Make (or get) AWS Role - https://console.aws.amazon.com/iam/home?#/roles

aws lambda create-function --function-name helloworld \
--zip-file fileb://./dist/function.zip --handler index.handler --runtime nodejs8.10 \
--role arn:aws:iam::656992703780:role/lambda-cli-role --profile peril

This makes a lambda. Add a layer runtime:

rm dist/layer.zip; cd layer; zip ../dist/layer.zip -r *; cd ..
aws lambda publish-layer-version --layer-name underscore-runtime --zip-file fileb://dist/layer.zip --profile peril

Now add it to the helloworld lambda:

aws lambda update-function-configuration --function-name helloworld --layers arn:aws:lambda:us-east-1:656992703780:layer:underscore-runtime:1 --profile peril

Now to update your lambda:

aws lambda update-function-code --function-name helloworld --zip-file fileb://./dist/function.zip  --profile peril

Invoke it:

aws lambda invoke --function-name helloworld dist/output.log --profile peril

From there, any updates to the layers will need to be re-applied to the functions. This is kinda cool, because in theory different folks could have different Peril runtimes.

You should be able to see:

In the Dashboard.

Misc notes: