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DevOps on Serverless
Sébastien Stormacq, Developer Evangelist
@sebsto

Serverless means

Serverless means
No Server to Provision or Manage Scale with Usage
Availability and Fault Tolerance Built-in No Idle Capacity to Pay for

Serverless across the stack
Database
AccessCompute
Developer Workflow

AWS Lambda
Changes in data state
Requests to endpoints
Changes in resource state
Event Source Functions
Node.js
Python
Java
C#
Go
Ruby
(*)

Typical Use Cases
Web applications
• Static websites
• Complex web
apps
• Packages for
Flask and
Express
Data processing
• Real-time
• MapReduce
• Batch
Chatbots
• Powering
chatbot
logic
Backends
• Apps & services
• Mobile
• IoT
</></>
Amazon Alexa
• Powering
voice-
enabled
apps
• Alexa Skills
Kit
IT automation
• Policy engines
• Extending AWS
services
• Infrastructure
management

Hello
AWS Lambda World
KEEP
CALM
and
WATCH
the
DEMO

How do you …
Automatically Provision & Configure
your serverless Infrastructure ?
(a.k.a. DevOps on Serverless)

Meet SAM !

Serverless Application Model
• CloudFormation extension optimized for serverless
• Serverless resource types: functions, APIs, tables
• Supports anything CloudFormation supports
• Open specification (Apache 2.0)
https://github.com/awslabs/serverless-application-model

Serverless Application Model (SAM)
Creates a Lambda function with
the referenced managed IAM
policy, runtime, code at the
referenced zip location, and
handler as defined.
Also creates an API Gateway and
takes care of all
mapping/permissions necessary
Tells CloudFormation this is a
template to transform
AWSTemplateFormatVersion: '2010-09-09’
Transform: AWS::Serverless-2016-10-31
Resources:
GetHtmlFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: s3://sam-demo-bucket/todo_list.zip
Handler: index.gethtml
Runtime: nodejs4.3
Policies: AmazonDynamoDBReadOnlyAccess
Events:
GetHtml:
Type: Api
Properties:
Path: /{proxy+}
Method: ANY
ListTable:
Type: AWS::Serverless::SimpleTable Creates a DynamodDB table

Introducing the SAM CLI
Usage: sam [OPTIONS] COMMAND [ARGS]...
…
Commands:
validate Validate an AWS SAM template.
init Initialize a serverless application with a...
package Package an AWS SAM application. This is an alias for 'aws
cloudformation package'.
deploy Deploy an AWS SAM application. This is an alias for 'aws
cloudformation deploy'.
logs Fetch logs for a function
local Run your Serverless application locally for...

Introducing the SAM CLI
https://github.com/awslabs/aws-sam-cli
pip install --user aws-sam-cli

Local Test
sam local generate-event ...
sam local invoke –-event event.json
sam local start-api #for API Gateway only
(requires Docker)

Package and Deploy
sam build
sam package --s3-bucket <BUCKET> > pack.yaml
sam deploy
--template-file pack.yaml
--stack-name <STACK>
--capabilities CAPABILITY_IAM

Hello
AWS SAM CLI
KEEP
CALM
and
WATCH
the
DEMO

Automate Developer Workflow
AWS CodeBuild
AWS CodeCommit
AWS Cloud9
AWS CodeDeploy
AWS
CodePipeline
Develop Build & Test Deploy

buildspec.yaml
version: 0.1
environment_variables:
plaintext:
"INPUT_FILE": "saml.yaml”
"S3_BUCKET": ”my_bucket"
phases:
install:
commands:
- npm install
pre_build:
commands:
- eslint *.js
build:
commands:
- npm test
post_build:
commands:
- sam package --template $INPUT_FILE --s3-bucket $S3_BUCKET --output-template post-saml.yaml
artifacts:
type: zip
files:
- post-saml.yaml
- beta.json
Variables
Different phases of the build
Create artifacts and store on them S3

Safe Deployment with SAM
• SAM integrates with Code Deploy
• Code Deploy integrates with Lambda
• Lambda Versioning supports traffic shifting

• Version = immutable deployment unit
• Alias = pointer to a version
Lambda Function
alias : LIVE
version : 6
version : 7
90%
10%

• Preconfigured canary and linear deployments
• Auto alarm-based rollbacks
• Pre and post traffic validation hooks
• Monitor through the CodeDeploy console
• Natively supported in SAM!

Resources:
GetHtmlFunction:
Properties:
CodeUri: s3://demo-bucket/todo_list.zip
Handler: index.js
Runtime: nodejs6.1

Globals:
Function:
AutoPublishAlias: Live
DeploymentPreference:
Type: Canary10Percent5Minutes
Resources:
GetHtmlFunction:
Properties:
Handler: index.js
Runtime: nodejs6.1
Policies: AmazonDynamoDBReadOnlyAccess

Globals:
Function:
AutoPublishAlias: Live
DeploymentPreference:
Type: Canary10Percent10Minutes
Hooks:
PreTraffic: !Ref CodeDeployHook_PreTest
PostTraffic: !Ref CodeDeployHook_PostTest
Alarms:
- !Ref DurationAlarm
- !Ref ErrorAlarm
Resources:
GetHtmlFunction:
Properties:
Handler: index.js
Runtime: nodejs6.1

Safe Deployments
KEEP
CALM
and
WATCH
the
DEMO

Orchestrate
Develop Build & Test Deploy

AWS CodePipeline
• Continuous delivery service for fast and reliable
application updates
• Model and visualize your software release process
• Builds, tests, and deploys your code every time there is
a code change
• Integrates with third-party tools and AWS

Serverless on AWS
Compute Developer Workflow

Take Away
1. Use the Lambda console for quick creation and iteration of
simple apps
2. Use AWS SAM to describe your serverless architecture
3. Plug SAM CLI into the IDE of your choice for testing and
debugging
4. Build on SAM for CI/CD capabilities, including linear & canary
deployments
5. Automate your deployment workflow using Code* family of
services

Thank you
Sébastien Stormacq, Developer Evangelist
@sebsto

�ݺ�ߣ

Devops on serverless

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