Top 8 mistakes developer teams make in their first serverless project

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Your development team is about to embark on its first fully serverless project. You want to get productive quickly and extract the most benefit from the AWS serverless ecosystem you are moving into. Find out the common pitfalls to avoid and ensure you get off on the best possible footing.

Technologie

@paulswail
8 mistakes teams make when
starting with serverless
PAUL SWAIL
Independent Cloud Architect, Winter Wind Software
Belfast, 24th January 2020

@paulswail
MISTAKE #1
AWS Console Driven
Development

@paulswail
ProblemsnotusingInfrastructure-as-Code
❌ Deployments not repeatable
❌ No version control of conﬁguration changes
❌ Slow for new starts to get set up
❌ IaC seen as tool for Ops/Systems Engineers, not
Developers

@paulswail
Useadeployment
frameworkfromday1

@paulswail
MISTAKE #2
(Trying to)
Run everything locally

@paulswail
Usecloudresourcesindevelopmentenvironment
✓ Consistency across team
✓ Closer representation of production
✓ Fewer “worked on my machine” bugs at
integration time
✓ Infrastructure-as-Code isn’t an afterthought

@paulswail
PERSONALAWSACCOUNT
Give each developer a sandboxed

@paulswail
MISTAKE #3
Putting Lambda functions
inside a VPC “for security”

@paulswail
ProblemswithVPC-enabledLambdafunctions
❌ No more secure than standard IAM-protected
functions
❌ Slower cold starts
❌ More network conﬁg to manage
❌ No internet access

@paulswail
Multi-purposeLambdafunction
❌ More IAM permissions = less secure
❌ No granular deployments
❌ Larger ﬁlesize = slower cold starts
❌ Hard to ﬁnd logs in CloudWatch

@paulswail
Prefersingle-purposeLambdafunctions

@paulswail
MISTAKE #5
Premature abstraction into
microservices

@paulswail
Structuringyourﬁrstserverlessproject
❖ Start with a monorepo
❖ Create 1 or 2 services
❖ Don’t overly worry about code duplication

@paulswail
MISTAKE #6
Testing the wrong things

@paulswail
IntegrationTests>UnitTestsforLambdas
🍒 Unit tests optional nice-to-have
🔥 For each test case, write 1 test & run in 2 modes:
- INTEGRATION
- ACCEPTANCE
(h/t Yan Cui’s Production-Ready Serverless course)

@paulswail
IntegrationMode
Fast workﬂow
No mocking of cloud services

@paulswail
AcceptanceMode
Post deployment
Runs in CI/CD pipeline
Catches conﬁg errors
(IAM permissions, etc)

@paulswail
MISTAKE #7
Only using
synchronous patterns

@paulswail
Synchronousﬂow
👎 Slow client response time
👎 Write your own error and
retry handling
👎 Complex Lambda code

@paulswail
Asynchronousﬂow
👍 Fast API response time
👍 Uses built-in retry
behaviour
👍 Single-purpose Lambda
functions

@paulswail
MISTAKE #8
Expecting too much from
cloud services

@paulswail
Selectingcloudservices…
➡ Overwhelming number of AWS services
➡ Primitive vs higher-level application services
➡ Event-driven architectures make it easy to integrate
with 3rd party services

NEWSLETTER: serverlessﬁrst.com
BLOG: winterwindsoftware.com
LINKED IN: linkedin.com/in/paulswail
TWITTER: @paulswail
THANK YOU!

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Top 8 mistakes developer teams make in their first serverless project

1. @paulswail 8 mistakes teams make when starting with serverless PAUL SWAIL Independent Cloud Architect, Winter Wind Software Belfast, 24th January 2020

2. @paulswail MISTAKE #1 AWS Console Driven Development

3. @paulswail ProblemsnotusingInfrastructure-as-Code ❌ Deployments not repeatable ❌ No version control of conﬁguration changes ❌ Slow for new starts to get set up ❌ IaC seen as tool for Ops/Systems Engineers, not Developers

4. @paulswail Useadeployment frameworkfromday1

5. @paulswail MISTAKE #2 (Trying to) Run everything locally

6. @paulswail Usecloudresourcesindevelopmentenvironment ✓ Consistency across team ✓ Closer representation of production ✓ Fewer “worked on my machine” bugs at integration time ✓ Infrastructure-as-Code isn’t an afterthought

7. @paulswail PERSONALAWSACCOUNT Give each developer a sandboxed

8. @paulswail MISTAKE #3 Putting Lambda functions inside a VPC “for security”

9. @paulswail ProblemswithVPC-enabledLambdafunctions ❌ No more secure than standard IAM-protected functions ❌ Slower cold starts ❌ More network conﬁg to manage ❌ No internet access

10. @paulswail MISTAKE #4 The Lambda of God

11. @paulswail Multi-purposeLambdafunction ❌ More IAM permissions = less secure ❌ No granular deployments ❌ Larger ﬁlesize = slower cold starts ❌ Hard to ﬁnd logs in CloudWatch

12. @paulswail Prefersingle-purposeLambdafunctions

13. @paulswail MISTAKE #5 Premature abstraction into microservices

14. @paulswail Structuringyourﬁrstserverlessproject ❖ Start with a monorepo ❖ Create 1 or 2 services ❖ Don’t overly worry about code duplication

15. @paulswail MISTAKE #6 Testing the wrong things

16. @paulswail IntegrationTests>UnitTestsforLambdas 🍒 Unit tests optional nice-to-have 🔥 For each test case, write 1 test & run in 2 modes: - INTEGRATION - ACCEPTANCE (h/t Yan Cui’s Production-Ready Serverless course)

17. @paulswail IntegrationMode Fast workﬂow No mocking of cloud services

18. @paulswail AcceptanceMode Post deployment Runs in CI/CD pipeline Catches conﬁg errors (IAM permissions, etc)

19. @paulswail MISTAKE #7 Only using synchronous patterns

20. @paulswail Synchronousﬂow 👎 Slow client response time 👎 Write your own error and retry handling 👎 Complex Lambda code

21. @paulswail Asynchronousﬂow 👍 Fast API response time 👍 Uses built-in retry behaviour 👍 Single-purpose Lambda functions

22. @paulswail MISTAKE #8 Expecting too much from cloud services

23. @paulswail Selectingcloudservices… ➡ Overwhelming number of AWS services ➡ Primitive vs higher-level application services ➡ Event-driven architectures make it easy to integrate with 3rd party services

24. NEWSLETTER: serverlessﬁrst.com BLOG: winterwindsoftware.com LINKED IN: linkedin.com/in/paulswail TWITTER: @paulswail THANK YOU!

Top 8 mistakes developer teams make in their first serverless project

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