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Serverless Architecture

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Cloud Computing - Reminders

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What is the Cloud?

“Cloud computing is on-demand access to virtualized IT resources that are housed outside of your own data center, shared by others, simple to use, paid for via

subscription, and accessed over the Web.”

- John Foley, Information Week IaaS

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What is the Cloud?

“Cloud computing is on-demand access to virtualized IT resources that are housed outside of your own data center, shared by others, simple to use, paid for via

subscription, and accessed over the Web.”

- John Foley, Information Week IaaS

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Different types of Cloud

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Serverless

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Hot topic

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What is Serverless?

• Two different but overlapping areas:

• Backend as a Service (BaaS)

• Function as a Service (FaaS)

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Backend as a Service

• 3rd party applications / services in the cloud to manage server-side logic and state

• Application using them were the first called Serverless

• Rich client applications (SPA or mobile apps)

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(Mobile) Backend as a Service: Example

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Backend as a Service: Example

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Functions as a Service• Server-side logic written by the application developer

• Run in stateless compute containers

• Event-triggered

• Ephemeral (one or more invocation)

• Fully managed by a 3rd party

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Functions as a Service: Example

https://aws.amazon.com/lambda/

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Functions as a Service: Example

https://aws.amazon.com/lambda/

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Functions as a Service: Example

https://aws.amazon.com/lambda/

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Language and Framework agnostic

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FaaS vs PaaS

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FaaS vs PaaS

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FaaS pricing

AWS Lambda Google Functions Azure Functions

Requests $0.20 / million requests $0.40 / million requests $0.20 / million requests

Duration $0.00001667 / GB-second $0.0000025 / GB-second$0.0000100 / GHz-second $0.000016 / GB-second

Free Tier 1 million requests / month400,000 GB-s / month

2 million requests / month400,000 GB-s / month200,000 GHz-s / month

1 million requests / month400,000 GB-s / month

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Traditional 3-tier client-orientedarchitecture

Client(Browser) PetStore

Server

Database

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Traditional 3-tier client-orientedarchitecture

Client(Browser)

PetStoreServer

Database

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Serverless Architecture

API Gateway

Purchase Function

Search Function

Client(Browser)

Authorization Service(Auth0)

Product Database(Firebase)

Purchase Database(Fauna)

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#NoOps?

• Serverless might mean ‘No internal Sys Admin’

• But ops are still recommended for:• Monitoring• Deployments• Security• And everything they never have time to focus on :-)

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Benefits

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Reduced operational cost• Economy of scale

• BaaS:• Less development• Less infrastructure• Less ops

• FaaS:• Only pay for the compute that you need!

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Easier Operational Management

• Scaling benefits

• Reduced packaging and deployment complexity

• Time to market / experimentation

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Drawbacks

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The inherent ones• Vendor control

• Multitenancy problems

• Vendor lock-in

• Security concerns

• FaaS are stateless

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The implementation ones

• Execution duration

• Testing

• Monitoring / Debugging

• Lack of tools and experience

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Serverless Framework• Command-line tool providing:

• Scaffolding

• Workflow automation

• Plugin system

• Easy deployment to most of the FaaS services

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Conclusion

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Conclusion• Serverless systems are still in their infancy

• Push a better thinking of the architecture• Micro-services!

• Reduce time-to-market

• Ready for production?

• Apache OpenWhisk (by IBM)!

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Thank you!