AWS Lambda Beginner

When to use

Run for up to 15 mins per invocation → short program, such as event-driven workloads

Don’t want to manage servers and don’t need to manager servers

💡

Other alternatives: but you need to manage your own instance: EC2, ELB

Cost

Based on compute time

How to deploy

Two types of deployment packages: zip and image. Here, I only care about scalable solutions.

zip

AWS CLI to Lambda

go get github.com/aws/aws-lambda-go/lambda
GOOS=linux CGO_ENABLED=0 go build main.go
zip function.zip main
aws lambda update-function-code --function-name my-function --zip-file fileb://function.zip

AWS CLI → S3 → Lambda

go get github.com/aws/aws-lambda-go/lambda
GOOS=linux CGO_ENABLED=0 go build main.go
aws s3 cp local_path s3_uri
aws lambda update-function-code --function-name my-function --s3-bucket s3_bucket --s3-key s3_key

💡

Most of the time, you will use the build tool, but underlying steps should look like the codes above.

Container image

TBD

How to test

Sync

aws lambda invoke --function-name my-function --payload '{ "key": "value" }' response.json

Async

aws lambda invoke \
  --function-name my-function  \
      --invocation-type Event \
          --cli-binary-format raw-in-base64-out \
              --payload '{ "key": "value" }' response.json

Invocation Concurrency Error Handling

Source

https://docs.aws.amazon.com/lambda/latest/dg/welcome.html