Talk by Dilip Kola, Co-Founder of Tensult on the topic "Advanced serverless application architecture and design considerations" at AWS Community Day Bangalore 2018

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Advanced serverless application
architecture and design
considerations
DILIP KUMAR KOLA, Co-founder Tensult | 6th October 2018

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Why Serverless?
Image caption 1 Image caption 3
Scalability Reduce Cost AutomationFaster Deployments

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You want to host a large-scale
blog platform with highly dynamic
content leveraging, “serverless
technology”. How would you do
it?

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CMS Back-end Architecture

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Authorization of backend users
Cognito
User Pool
CMS
Application
API
Gateway
CMS
API
CloudFront
Cognito
Identity Pool
S3
For storing photos and videos
DynamoDB Lambda Elastic
Search
Populating to ES to enable search
Lambda S3
Sitemaps and RSS feeders
CMS User

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Website Architecture

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API
Gateway
Website
API
CloudFront
DynamoDB
Elastic
Search
S3
Web User
Sitemaps and RSS feeders
Data Retrieval

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Application Components Architecture

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API
Gateway
CMS API Internal
Request
Handler
Authentication
Handler
Authorization
Handler
Error
Handler
Routes Services
Validations
DynamoDB

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Deployment Architecture

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Code
Repository
Services
CMS Routes
Web Routes
API
Gateway
API
Gateway
CMS API
Services
CMS Routes
Web Routes
Web API
Deploy to
CMS API
Deploy to
Web API
CMS API
Web API

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let userGreeting = "Hello <name>! Have a Nice day!!”;
exports.handler = async (event) => {
console.log("event received", event);
userGreeting = userGreeting.replace("<name>", event.name);
console.log(userGreeting);
return userGreeting;
};
Is there any problem with the above lambda function?

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function getUserGreeting() {
return "Hello <name>! Have a Nice day!!";
}
exports.handler = async (event) => {
console.log("event received", event);
let userGreeting = getUserGreeting();
userGreeting = userGreeting.replace("<name>", event.name);
console.log(userGreeting);
return userGreeting;
};

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Global Variables
• Lambda will re-use the container to execute the function so, treat
everything outside the handler of lambda function as constant
• Incase if you want to modify any global variables while executing, wrap
it in a function like the example shown before

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You have to sent news letters to
thousands of your blog subscribers,
how will you do that?

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CloudWatch
Rule
Fetch News Letter
Template
News Letter
Template
Cache
Elastic
Search
Fetch List of
Users
Send News Letter
SES
SNS
Send Token to fetch
next User List
Newsletter Function

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Cloud Reports Architecture

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ReportersAnalyzersCollectors
Collects Information
from cloud provider
Analyzes Information
against best
practices
Generates Report in
Various Formats

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API
Gateway
DynamoDBLambda Lambda SQS Cloud Reports
Application
S3
Validations
Storing Meta-Data

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Loop Prevention:
• Code review
• Data flow review
Loop Detection:
• Set up an invocation count alarm for each Lambda function and set
notification using SNS.
• Setting up Billing alerts to monitor resource usage.

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Monitoring
• Memory Utilization
• Invocation Count
• Duration of execution
• Load testing with different memory size
• Throttling
• Dashboards

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Thank you