Functional programming-in-the-cloud

Functional Programming in the cloud - exploring what functional programming can teach us about DevOps.

Technology

@garysieling
FUNCTIONAL PROGRAMMING INFUNCTIONAL PROGRAMMING IN
THE CLOUDTHE CLOUD

@garysieling
DEVELOPMENT PARADIGMSDEVELOPMENT PARADIGMS
Desktop
Mobile
IOT

@garysieling
BRING YOUR OWN VS. MANAGEDBRING YOUR OWN VS. MANAGED
SaaS
Functions
Scaling
Runtime
OS
Virtualization
Hardware

@garysieling
EXAMPLE ARCHITECTUREEXAMPLE ARCHITECTURE
S3 host front-end
Microservices (Lambda + API Gateway)
A private link to a customer account
AWS handles database backups & high availability

@garysieling
FUNCTIONAL PROGRAMMINGFUNCTIONAL PROGRAMMING
A paradigm that treats computation as
the evaluation of mathematical
functions and avoids changing state
and mutable data. The output of a
function depends only on the
arguments passed to a function, so
calling a function twice with the same
arguments produces the same result
each time...

@garysieling
WebsiteBucketPolicy:
Type: AWS::S3::BucketPolicy
Properties:
Bucket: !Ref WebsiteBucket
PolicyDocument:
Statement:
-
Action:
- "s3:GetObject"
Effect: "Allow"
Resource:
Fn::Join:
- ""
-
- "arn:aws:s3:::"
- Ref: "WebsiteBucket"
- "/*"
Principal: "*"

@garysieling
f(configuration) => resources

@garysieling
SIDE-EFFECTSSIDE-EFFECTS
Account limits
Billing
Time spent

@garysieling
INDEX.JSINDEX.JS
(event, context, callback) =>
callback("Success")

@garysieling
(event, context, callback) =>
callback(<h3>Hi!</h3>)

@garysieling
(event, context, callback) => {
console.log("I was here.");
callback(<h3>Hi!<h3>);
}

@garysieling
timelimit -T 600
docker run
--memory=2g
--cpus=1.5
node index.js

@garysieling
EXECUTION CONTEXTEXECUTION CONTEXT
Logging (Cloudwatch)
Container
ENI
Defined memory/CPU/disk
Security groups
Hardware (e.g. GPU, EBS Optimization)

@garysieling
IDEMPOTENCYIDEMPOTENCY
AWS SAM
localstack

@garysieling
UNBUNDLED PRICINGUNBUNDLED PRICING
CPU
Memory
Disk
Network

@garysieling
A SOFTWARE ARCHITECT CAN PLANA SOFTWARE ARCHITECT CAN PLAN
USING FUTURE COSTSUSING FUTURE COSTS
Now: Story points (time + risk)
Future: Operational cost (NPV / cost shape)

@garysieling
POWER DYNAMICS WITH THE PROVIDERPOWER DYNAMICS WITH THE PROVIDER
Many cloud services are "free" - e.g. ECS
Reserved instances
In vs. out of network

@garysieling
LESSONS LEARNEDLESSONS LEARNED
Some DevOps outsourced to AWS is the work that
requires judgement
AWS forces you to learn DevOps
Forced awareness of security
We're all DevOps

@garysieling
REFERENCESREFERENCES
https://start.jcolemorrison.com/aws-vpc-core-
concepts-analogy-guide/

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