"Learning Objectives: - Teach best practices for building and deploying serverless apps and introduce the AWS Serverless Application Repository - Show step-by-step examples for building and deploying serverless apps - Demonstrate how to build more complex apps by linking services together using existing apps as examples"

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Paul Johnston, Senior Serverless Developer Advocate,
EMEA
April 24, 2018
Tips and Tricks for Deploying
Serverless Apps In Minutes

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Session Objectives
1. Understand what the AWS Serverless Application Repository is
2. Learn some best practices for creating serverless applications
3. Give hands on examples for building and deploying serverless
applications
4. Show how you can build more complex examples by linking
services/applications together

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AWS Serverless Application Repository

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Overview
• Quickly deploy code samples, components and complete applications
for common use cases (web back end, logging etc)
• Apps are packaged using AWS Serverless Application Model (SAM)
• Publicly shared apps also include a link to the source code
• No additional charge to use Serverless Application Repository - you
only pay for the resources used

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Deploying 3rd Party Apps Can Be Difficult
🔎
Directed to a repo
e.g. in Github
Search/ask in forum
for solution
Read installation
instructions
📄
Attempt to
install it
… follow installation instructions …
… edit more files …
… integrate with existing solution …

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Discovery And Deployment
• Finding the “right” serverless apps is hard e.g. Github search
• Knowing whether they are good or even right for my use case is
difficult to judge
• Quality and provenance is important
• Apps are often disconnected from infrastructure

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Serverless Application Repository
✅ Search and find applications for your use case
✅ Repository displays the publisher, a link to the source code, and an
explanation of how the application works
✅ Each app can be deployed into your AWS Account by clicking “Deploy”
and entering any required parameters
✅ No need to know the language for any AWS Lambda functions as
each application is self contained and runs in its own environment

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Serverless Application Repository
✅ Public and Private applications
✅ Private applications can be shared within an AWS Account or with
other AWS Accounts

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Using The Serverless Application Repository
🔎
Search for elements
in Serverless
Application
Repository
Examples from the repository include a serverless web
uploader or an AWS Lambda site generator
View Readme and
License
📄
Click Deploy to install to your AWS Account
as an AWS CloudFormation Stack

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Deploying An Application

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Deploying An Application

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Deploying An Application

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Deploying An Application

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Deploying An Application

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Deploying An Application

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Defining Serverless Applications
Apps in the Serverless Application
Repository are defined using the
AWS Serverless Application Model
aka SAM

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AWS SAM
AWS SAM extends AWS CloudFormation
to simplify definition of resources for
serverless applications
SAM Translator transforms SAM
templates into AWS CloudFormation
templates
Open Source specification and
implementation (Apache 2.0 License)

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AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31
Resources:
ExampleFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: s3://sam_demo_bucket/lambda_code.zip
Handler: index.handler
Runtime: nodejs6.10
Events:
GetHtml:
Type: Api
Properties:
Path: /{proxy+}
Method: ANY
ListTable:
Type: AWS::Serverless::SimpleTable
Example SAM Template

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AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31
Resources:
ExampleFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: s3://sam_demo_bucket/lambda_code.zip
Handler: index.handler
Runtime: nodejs6.10
Events:
GetHtml:
Type: Api
Properties:
Path: /{proxy+}
Method: ANY
ListTable:
Type: AWS::Serverless::SimpleTable
Example SAM Template
Tells CloudFormation this is
a SAM template

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AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31
Resources:
ExampleFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: s3://sam_demo_bucket/lambda_code.zip
Handler: index.handler
Runtime: nodejs6.10
Events:
GetHtml:
Type: Api
Properties:
Path: /{proxy+}
Method: ANY
ListTable:
Type: AWS::Serverless::SimpleTable
Example SAM Template
AWS Lambda function defined

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AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31
Resources:
ExampleFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: s3://sam_demo_bucket/lambda_code.zip
Handler: index.handler
Runtime: nodejs6.10
Events:
GetHtml:
Type: Api
Properties:
Path: /{proxy+}
Method: ANY
ListTable:
Type: AWS::Serverless::SimpleTable
Example SAM Template
Amazon API Gateway
interface defined and
connected to Lambda
Function

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AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31
Resources:
ExampleFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: s3://sam_demo_bucket/lambda_code.zip
Handler: index.handler
Runtime: nodejs6.10
Events:
GetHtml:
Type: Api
Properties:
Path: /{proxy+}
Method: ANY
ListTable:
Type: AWS::Serverless::SimpleTable
Example SAM Template
Amazon DynamoDB Table
defined for use by Lambda
function

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AWS SAM Permissions And Policies: Quick Tips
Only certain policy templates are allowed
You cannot create custom policies for
Serverless Application Repository Apps
For the full list of supported AWS Policies
and permissions go here:
https://docs.aws.amazon.com/serverlessr
epo/latest/devguide/using-aws-sam.html

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Serverless Application Definitions
AWS SAM template
+
Amazon S3 stored code (CodeUri block)
=
Serverless Application

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Best Practices For
Creating Serverless Applications

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Keep Your Applications Well Defined
• Don’t do too much in each application
• A few resources per application should suffice
• Consider combining multiple apps together so you can save time by
leveraging pre-built templates and build more complex solutions

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Small Applications
Amazon S3
Source
Bucket
Amazon S3
Output
Bucket
(defined by
parameter)
Lambda
Function
Output
Application
Definition
Put images
into bucket
Event
Trigger
SAM template:
https://github.com/evanchiu/serverless-
galleria/blob/master/sepia/template.yml

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Parameters: Insights And Tips
• Your deployed app resources are in a single unit called a stack
• Parameters enable you to input custom values to your template each time
you create or update a stack
• Parameters enable users to define deployment configurations
• e.g. defining anAmazon S3 bucket to use as a source or destination in an
application
• Tip: Consider security of API Keys and similar e.g.AWS Key Management
Management Service (KMS)

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Parameters
...
Parameters:
SplunkHttpEventCollectorURL:
Type: "String"
Description: "URL address of your Splunk HTTP event
collector endpoint"
...
Resources:
IoTFunction:
Type: AWS::Serverless::Function
Properties:
...
Environment:
Variables:
SPLUNK_HEC_URL: !Ref SplunkHttpEventCollectorURL
...
SAM template:
https://github.com/splunk/splunk-aws-
serverless-apps/blob/master/splunk-iot-
processor/template.yaml

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Outputs
• Each Application deploys as a CloudFormation Stack
• The Outputs section declares output values that you can import into
other stacks, return in response (to describe stack calls), or view in the
AWS CloudFormation console.
• Allows you to do cross-stack referencing

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Outputs
...
SplunkHttpEventCollectorToken:
Type: "String"
Description: "Token of your Splunk HTTP event
collector endpoint"
Outputs:
SplunkIoTProcessorFunction:
Description: "Splunk IoT Serverless Function"
Value: !GetAtt IoTFunction.Arn
Resources:
IoTFunction:
Type: AWS::Serverless::Function
Properties:
Handler: index.handler
...
SAM template:
https://github.com/splunk/splunk-aws-
serverless-apps/blob/master/splunk-iot-
processor/template.yaml

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Consider Input/Output For Your Application
How will your application be triggered?
How will the user configure where they want the output to go?

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Consider Input/Output For Your Application
Amazon
CloudWatch
Amazon
DynamoDB
TwitterSearchPoller
Async invoke
Application
Definition
Search API
Polling
Schedule
(Input)
Search
Checkpoint
Lambda function
output specified as
parameter
SAM template:
https://github.com/awslabs/aws-
serverless-twitter-event-
source/blob/master/app.template.yml

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Private Apps
• Useful for sharing internal resources and patterns
• Private apps are region specific
• Private apps can be shared across users and accounts

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Building And Deploying
Serverless Applications

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Before You Start Building…
Check:
• Does your application already exist?
• Does something similar exist that you can copy?
https://serverlessrepo.aws.amazon.com/applications

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Build, Publish And Share Quality Apps
Core application consists of:
• SAM template (YAML or JSON)
• Associated code and template files e.g. Lambda function code
To see great examples that cover monitoring, media processing, machine
learning, and more, visit the Serverless Application Repository

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Build, Publish And Share Quality Apps
• Unit Testing – e.g. `npm test`
• Local Testing - `sam local start-api`
• Deploy to personal CloudFormation Stack & test - `sam package` &
`sam deploy`

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Publishing Applications
• SAM Template
• An AWS CloudFormation package - `sam package`
• Source code URL e.g. Github
• A readme.txt file that describes your application & how the
parameters allow users to configure it on deployment
• A license.txt file
• An Amazon S3 bucket containing your build artifacts & grants service
read permissions to Serverless Application Repository

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Publishing An Application
Go to:
https://console.aws.amazon.com/serverlessrepo

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Publishing An Application

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Publishing An Application

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Publishing An Application

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Publishing An Application

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Publishing An Application

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Publishing An Application

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Publishing an application

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Publishing An Application: Quick Tips
• Clicking on the Visibility switch will make the application public
• Leaving it switched off leaves the application private
• Private applications are region specific

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Publishing A New Version Of An Application

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Combining Serverless Applications

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Serverless Applications
• No application sits in isolation
• An organization may have many serverless applications in production

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Combining Applications: Benefits
• You can create a new application by combining 2 or more applications
• e.g. an application that reads tweets with a specific phrase from the
twitter search API can then post to a Lambda function in another
application.

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Combining Applications
Amazon
CloudWatch
Amazon
DynamoDB
TwitterSearchPoller
Async invoke
Application
Definition
Search API
Polling
Schedule
(Input)
Search
Checkpoint
Application
Definition
AnalyseTweet
Amazon SNS
Publish to
Topic
Output via subscription
to SNS Topic
aws-serverless-twitter-event-source Proposed application

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Combining Applications
• It’s a complete application
• Large parts of development are done for you
• The applications are combined by the user
• Can combine public and private applications

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Combining Applications: More Benefits
• Additional Lambda functions for routing between applications can
make for rapid application development
• Allows for combinations to be put together and easily broken apart
• Easily composable
• Easily broken down

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Combining Applications With Lambda functions
Amazon
CloudWatch
Amazon
DynamoDB
TwitterSearchPoller
Async invoke
Application
Definition
Search API
Polling
Schedule
(Input)
Search
Checkpoint
Application
Definition
AnalyseTweet
Amazon SNS
Publish to
Topic
Output via subscription
to SNS Topic
aws-serverless-twitter-event-source Proposed application
Routing Lambda
Other application?

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Conclusion

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What We Learned
1. What the AWS Serverless Application Repository is
2. Some best practices for creating serverless applications
3. How to build and deploy serverless applications
4. How you can build more complex examples by combining
applications together

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Thank you

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Paul Johnston, Senior Serverless Developer Advocate, EMEA
April 24, 2018
Tips and Tricks for Deploying
Serverless Apps In Minutes