Deploying Serverless Apps With Terraform

whoami

James Strong

Technical Principal @ Contino

@strongjz

https://jamesstrong.dev

Agenda

Serverless
AWS Serverless Application Model (SAM)
Development
Terraform deployment
Demo Slack Bucks

Architecture

Slack Bucks Architecture

Serverless

Image Credit

AWS Serverless Application Model (SAM)

AWS SAM

AWS SAM template specification

   Transform: 'AWS::Serverless-2016-10-31'
   Resources:
   
     ThumbnailFunction:
       # This resource creates a Lambda function.
       Type: 'AWS::Serverless::Function'
       
       Properties:
         
         # This function uses the Nodejs v6.10 runtime.
         Runtime: nodejs6.10
           
         # This is the Lambda function's handler.
         Handler: index.handler
         
         # The location of the Lambda function code.
         CodeUri: ./src
         
         # Event sources to attach to this function. In this case, we are attaching
         # one API Gateway endpoint to the Lambda function. The function is
         # called when a HTTP request is made to the API Gateway endpoint.
         Events:
   
           ThumbnailApi:
               # Define an API Gateway endpoint that responds to HTTP GET at /thumbnail
               Type: Api
               Properties:
                   Path: /thumbnail
                   Method: GET

AWS SAM CLI

Reference

sam build
sam deploy
sam init
sam local generate-event
sam local invoke
sam local start-api
sam local start-lambda
sam logs
sam package
sam publish
sam validate

AWS SAM CLI

sam local generate-event
sam local invoke
sam local start-api
sam local start-lambda

Lambda

“AWS Lambda is a compute resource that runs your code in response to events and automatically manages the compute resources for you, making it easy to build applications that respond quickly to new information”

Lambda

Code: s3
Metadata: DynamoDB
Execution: EC2 instances
Permissions: IAM Roles

Lambda

Function
Resources Allocation
Code
Event
Trigger

Limits

Lambda

“Run and forget”

Lambda

Drawback: Does NOT respond to HTTP Events

AWS API Gateway

Create REST APIs
Create WebSocket APIs

AWS API Gateway

Endpoint
Methods
Integration - Backend

AWS API Gateway Integrations

Lambda
HTTP
S3 Proxy
Kinesis Proxy

AWS API Gateway Endpoints

Edge Optimized
Regional
Private API

AWS API Gateway Methods

HTTP Method
Request Parameters
Request Model
Request Authorization
Request Validation

AWS API Gateway Authorization

IAM roles and policies (AWS_IAM)
Amazon Cognito user pool (COGNITO_USER_POOLS)
A Lambda authorizer (CUSTOM)

Dynamodb

Serverless Web scale NOSQL AWS managed database.

S3

s3

Web Scale Storage

Serverless Development

Lambda setup

There’s three basic options for structuring this using AWS Lambda:

Monolith — One lambda function manages all the API actions.
Service — A single lambda function is responsible for a group of related actions.
Microservice — A single lambda function is responsible for only one action.

Lambda setup - Monolith

Lambda setup - Service

Lambda setup - Microservice

Ngrok

Spend more time programming. One command for an instant, secure URL to your localhost server through any NAT or firewall.

https://ngrok.com/product

Ngrok

AWS SAM

Install Guide

brew upgrade
brew update
brew tap aws/tap
brew install aws-sam-cli

First, we install the Lambda go libraries

go get github.com/aws/aws-sdk-go

go get github.com/aws/aws-lambda-go/events

go get github.com/aws/aws-lambda-go/lambda

Next, we install the core library

go get github.com/awslabs/aws-lambda-go-api-proxy

go get github.com/awslabs/aws-lambda-go-api-proxy/gin

AWS Dynamodb Local

AWS Dynamodb Local Running

docker run -p 8000:8000 amazon/dynamodb-local:1.11.477

Deployment

AWS Serverless Application Model

This is great if we stick to the AWS Cloudformation

Slack Bucks Architecture

Terraform code

https://github.com/strongjz/slack-bucks/blob/master/terraform/

Demo

https://github.com/strongjz/slack-bucks

Closing remarks

@strongjz

strong.james.e@gmail.com

https://jamesstrong.dev