The Serverless Application Model (SAM) comes in two parts: SAM templates and the SAM CLI. SAM templates use shorthand syntax to define serverless resources and functions in infrastructure as code templates, while the SAM CLI provides tooling for local development, packaging, and deploying serverless applications. The latest version of the SAM CLI streamlines the deployment process, removes the need for developers to manage their own S3 buckets, and provides clearer deployment feedback and outputs.

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What’s NewWith SAM?
Ben Smith
Senior Developer Advocate, AWS Serverless
@benjamin_l_s

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S
A
M

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Serverless
Application
Model

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SAM comes in 2 parts

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SAM comes in 2 parts
SAM templates SAM CLI
Using shorthand syntax to
express resources and event
source mappings, it provides
infrastructure as code (IaC)
for serverless applications.
Provides tooling for local
development, debugging,
build, packaging, and
deployment for serverless
applications

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SAMTemplates
• Can mix in other CloudFormation resources
• i.e. Amazon S3, Amazon Kinesis, AWS Step
Functions
• Supports use of Parameters, Mappings, Outputs,
• Supports Intrinsic Functions
• ie: Ref, Sub, Join, Select, Split
• YAML or JSON

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AWSTemplateFormatVersion: '2010-09-09’
Transform: AWS::Serverless-2016-10-31
Resources:
GetProductsFunction:
Type: AWS::Serverless::Function
Properties:
Handler: index.getProducts
Runtime: nodejs10.x
CodeUri: src/
Policies:
- DynamoDBReadPolicy:
TableName: !Ref ProductTable
Events:
GetResource:
Type: Api
Properties:
Path: /products/{productId}
Method: get
ProductTable:
Type: AWS::Serverless::SimpleTable
In just 20 lines:
• Lambda function
• IAM role
• API Gateway
• DynamoDB table
SAMTemplates

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AWSTemplateFormatVersion: '2010-09-09’
Transform: AWS::Serverless-2016-10-31
Resources:
GetProductsFunction:
Type: AWS::Serverless::Function
Properties:
Handler: index.getProducts
Runtime: nodejs10.x
CodeUri: src/
Policies:
- DynamoDBReadPolicy:
TableName: !Ref ProductTable
Events:
GetResource:
Type: Api
Properties:
Path: /products/{productId}
Method: get
ProductTable:
Type: AWS::Serverless::SimpleTable
SAMTemplates
AWS Cloud
Amazon API Gateway
Lambda function
Table Role

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SAM Command
Line Interface
CLI tool for local development, debugging,
testing, deploying, and monitoring of serverless
applications

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SAM CLI
Minimized Deployment
Commands
This:
sam package --s3-bucket my-regional-bucket --
output-template-file out.yaml
sam deploy --template-file out.yaml --capabilities
CAPABILITY_IAM --stack-name MyStackName
> sam deploy
Is now this:

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SAM CLI
S3 Bucket Management
• SAM CLI now automatically creates a Bucket
> sam deploy

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SAM CLI
The Guided Deployment
• A new Interactive deployment process
> sam deploy –g (--guided)

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SAM CLI
The Guided Deployment
• Deployment config saved in samconfig.toml.

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SAM CLI
The Guided Deployment
• Deployment config saved in samconfig.toml.

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SAM CLI
The Guided Deployment
• Deployment config saved in samconfig.toml.

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SAM CLI
The Guided Deployment
• Deployment config saved in samconfig.toml.

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SAM CLI
The Guided Deployment
• Deployment config saved in samconfig.toml.

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SAM CLI
The Guided Deployment
• Deployment config saved in samconfig.toml.

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SAM CLI
Updated User Interface
• More feedback and validation choices

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SAM CLI
Updated User Interface
• Developers can confirm changeset before
deploying

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SAM CLI
Updated User Interface
• Console displays changes and outputs

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• SAM CLI outputs example

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SAM CLI - FAQ
Backwards Compatibility ?
• SAM package still exists

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SAM CLI - FAQ
Backwards Compatibility ?
• Parameters can be passed in for CICD
deployments
sam package --s3-bucket aws-sam-cli-managed-default-
samclisourcebucket-xic3fipuh9n9 --output-template-file
out.yaml
sam deploy --template-file out.yaml --capabilities
CAPABILITY_IAM --stack-name sam-app --region us-west-2

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SAM CLI - FAQ
How many buckets are
Created ?
1 bucket per Region for a root level account

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SAM CLI - FAQ
What if samconfig.toml
is deleted ?
• SAM treats the application as new.
• Use the -g flag to reconfigure the application.

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Summary
• Streamlining the deployment process
• Removing the need to manage an S3 bucket
• Providing clear deployment feedback and data
Latest version of SAM CLI makes serverless development easier for developers by:

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Thank you
Ben Smith
Senior Developer Advocate, AWS Serverless
@benjamin_l_s