When it comes to writing IAC (Infrastructure as Code) for AWS (Amazon Web Services) there are numerous ways to accomplish the same thing. In this talk, we will weigh the following options, native AWS CloudFormation, AWS SAM (Serverless Application Model), and the Serverless Framework. We’ll also explore the benefits and trade-offs of each option.

1. How to Write IAC for
Serverless
Ryan Jones
Founder & CEO
Serverless Guru
Yann Stoneman
Full Stack Cloud Developer
Serverless Guru

2. Serverless Guru
serverlessguru.com
Training, Consulting, Developing

3. IAC (Infrastructure as Code)
AWS CloudFormation
AWS SAM (Serverless Application Model)
Serverless Framework
Terraform
What is…?

4. AWS CloudFormation

5. AWSTemplateFormatVersion: "2010-09-09"
Description: "My API Gateway and Lambda function"
Parameters:
apiGatewayStageName:
Type: "String"
AllowedPattern: "^[a-z0-9]+$"
Default: "call"
lambdaFunctionName:
Type: "String"
AllowedPattern: "^[a-zA-Z0-9]+[a-zA-Z0-9-]+[a-zA-Z0-
9]+$"
Default: "my-function"
Resources:
apiGateway:
Type: "AWS::ApiGateway::RestApi"
Properties:
Name: "my-api"
Description: "My API"
apiGatewayRootMethod:
Type: "AWS::ApiGateway::Method"
Properties:
AuthorizationType: "NONE"
HttpMethod: "POST"
Integration:
IntegrationHttpMethod: "POST"
Type: "AWS_PROXY"
Uri: !Sub
- "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-
31/functions/${lambdaArn}/invocations"
- lambdaArn: !GetAtt "lambdaFunction.Arn"
ResourceId: !GetAtt "apiGateway.RootResourceId"
RestApiId: !Ref "apiGateway"
apiGatewayDeployment:
Type: "AWS::ApiGateway::Deployment"
DependsOn:
- "apiGatewayRootMethod"
Properties:
RestApiId: !Ref "apiGateway"
StageName: !Ref "apiGatewayStageName"
lambdaFunction:
Type: "AWS::Lambda::Function"
Properties:
Code:
ZipFile: |
def handler(event,context):
return {
'body': 'Hello there {0}'.format(event['requestContext']['identity']['sourceIp']),
'headers': {
'Content-Type': 'text/plain'
},
'statusCode': 200
}
Description: "My function"
FunctionName: !Ref "lambdaFunctionName"
Handler: "index.handler"
MemorySize: 128
Role: !GetAtt "lambdaIAMRole.Arn"
Runtime: "python2.7"
Timeout: 10
lambdaApiGatewayInvoke:
Type: "AWS::Lambda::Permission"
Properties:
Action: "lambda:InvokeFunction"
FunctionName: !GetAtt "lambdaFunction.Arn"
Principal: "apigateway.amazonaws.com"
SourceArn: !Sub "arn:aws:execute-
api:${AWS::Region}:${AWS::AccountId}:${apiGateway}/*/POST/"
lambdaIAMRole:
Type: "AWS::IAM::Role"
Properties:
AssumeRolePolicyDocument:
Version: "2012-10-17"
Statement:
- Action:
- "sts:AssumeRole"
Effect: "Allow"
Principal:
Service:
- "lambda.amazonaws.com"
Policies:
- PolicyDocument:
Version: "2012-10-17"
Statement:
- Action:
- "logs:CreateLogGroup"
- "logs:CreateLogStream"
- "logs:PutLogEvents"
Effect: "Allow"
Resource:
- !Sub "arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-
group:/aws/lambda/${lambdaFunctionName}:*"
PolicyName: "lambda"
lambdaLogGroup:
Type: "AWS::Logs::LogGroup"
Properties:
LogGroupName: !Sub "/aws/lambda/${lambdaFunctionName}"
RetentionInDays: 90
Outputs:
apiGatewayInvokeURL:
Value: !Sub "https://${apiGateway}.execute-
api.${AWS::Region}.amazonaws.com/${apiGatewayStageName}"
lambdaArn:
Value: !GetAtt "lambdaFunction.Arn"

6. Serverless Framework

8. AWS SAM

10. Terraform

12. Pick a Question!
Why use AWS
SAM?
Why use the Serverless
Framework?
Where to learn?
Why not write raw AWS
CloudFormation?
What do our clients use?
How do we handle
deployments?
What are the benefits of
IAC?
Why not just use the AWS
console?

13. Pick a Question!
How does the serverless
framework deploy
resources?
When to use IAC?
How do I build multiple
stage environments?
When to not use IAC?
How do you debug?
What are some best
practices?
What is a full stack
cloud developer?

14. Pick a Question!
Which IAC solution
gets updates first?
What IAC solution do yall
use and why?
What are Serverless
Framework Components?
What traps should I avoid
when writing IAC?
Which solution is
best for testing?

15. Ryan Jones
ryanjonesirl
ryanjonesirl
Founder & CEO
Yann Stoneman
ystoneman
yannstonman
Full Stack Cloud Developer