Cloud development has changed when AWS Lambda was introduced in 2014. Instead of provisioning and managing servers, developers were able to focus on their code, creating event-driven, on-demand functions. Harnessing automatically scalable, always available code. Using Lambda functions integration with other AWS services and step functions developers can create whole applications. In this talk, I’ll show how to use Lambdas to create scalable, fault-tolerant applications using event-driven, cost-effective, serverless architecture.

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2. Creating serverless architecture
with AWS Lambdas
Dror Helper | http://helpercode.com | @dhelper

3. Consultant & software srchitect
Developing software since 2002
Clean Coder & Test Driven Developer
Pluralsight author
https://www.pluralsight.com/authors/dror-helper
B: http://helpercode.com
T: @dhelper
About.ME

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Virtualization Evolution
Physical
servers
Virtual
Machines
Containers
Functions
as a Service
Monolith SOA
Micro
Services
Serverless

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AWS Lambda Introduced in
2014
Execution time
< 5 min
Allocated
memory
determines CPU
Multiples
Language
Supported
Triggered by
AWS services

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AWS Lambda (Python)
def lambda_handler(event, context):
print('Checking {} at {}'.format(SITE, event['time']))
try:
if not validate(str(urlopen(SITE).read())):
raise Exception('Validation failed')
except:
print('Check failed!')
raise
else:
print('Check passed!')
return event['time']

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public async Task<string> FunctionHandler(S3Event evnt, ILambdaContext context) {
var s3Event = evnt.Records?[0].S3;
if(s3Event != null)
return null;
try {
var response = await _s3Client
.GetObjectMetadataAsync(s3Event.Bucket.Name, s3Event.Object.Key);
return response.Headers.ContentType;
}
catch(Exception e) {
context.Logger.LogLine($"Error reding object metadata"
throw;
}
}
AWS Lambda (C#)

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Benefits of using FaaS
No
provisioning
No server
management
fault tolerant
Continuous
scaling with
usage
Pay by usage –
don’t pay for
idle

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Event Driven
AWS
Lambda
Events
Data Store
Services

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From Server to Serverless

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Serverless
Architecture
Requires no management of Server
hosts/processes
Self auto-scales and auto-provisions, based on
load
Offers costs based on precise usage
Has performance capabilities defined in terms
other than host size / count
Has implicit High Availability
https://www.oreilly.com/programming/free/what-is-serverless.csp

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DEMO: Serverless application

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Serveless benefits
Reduced
operational costs
Focus on business
logic
Development
agility – quick and
isolated
Easier
optimizations
Different
components scale
independently
Simple(r)
deployments

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Serverless is not Perfect
On the one hand…
High availability
Continuous scaling
Pay as you go
Reduce maintenance
Easy to deploy to the cloud
No need for orchestration
However…
Need to factor cold starts
There are hard/soft limit
It’s not always cheaper
Still need monitoring/auditing
Diffcult to debug on your machine*
Actually – implicit orchastration

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Lambda
Orchestration

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Takeaways
• Lambda is easy!
• Enable rapid development  reduced costs
• Many applications can be serverless
• Continuously monitor and optimize
We’re just getting started

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@DeveloperDaysPL
Thank you 
Dror Helper | http://helpercode.com | @dhelper

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Strategic Sponsor
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