λ in Practice or how i learned to stop worrying and love not having servers

@tobyhede

Toby Hede

OH HAI

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Technology LeadDigital Transformation OfficeTeh GOvernment

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BackgroundWhat is it?

Why λ?

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All-of-Gov Performance Dashboard

Measure the performance of government services against metrics defined in the Digital Service Standard.

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All-of-Gov Performance Dashboard

Measure the performance of government services against metrics defined in the Digital Service Standard.

Drive the continuous improvement of government services for users and increase government transparency.

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Data๏ Multiple data sources๏ Disparate data sources๏ We don’t actually know what they all are yet๏ We don’t know how much of it we will have

Obligatory GIF

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Data๏ Connect all the moving pieces๏ Transform data from many different sources๏ Move fast๏ Adapt quickly

ArchitectureHow are we using λ?

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Caveats

We are just finishing AlphaProduction this week, pending approvalsGoing into Beta phaseExpanding our usage of λ

YOUR SHIPMENT OF CLOUD HAS ARRIVED

Serverless Framework

Configuration

Environments

Deployment

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Random Thoughts

Vendor Lock InDependenciesSecurityTestingWhat about other Amazon products and/or servicesZero infrastructure and a surprising amount of configuration

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Vendor Lock In• Meh

Businesswoman with question marks behind her, hard decision

What about vendor lock-in!!!!?

Convert to an express function

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An aside

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Security and IAM• AmazonAPIGatewayAdministrator• AWSLambdaFullAccess• AWSLambdaVPCAccessExecutionRole• ec2:DescribeSecurityGroups• ec2:DescribeSubnets• Built-in Serverless Policy

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Dependencies• Requires some planning• Nest packages with npm• Favour reimplementation of simple helpers rather

then pull in a dependency

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Testing• Unit test functions• If testing a function is hard, you are doing it wrong• ava is good• Can run Serverless locally using a plugin

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What about other AWS products• Possible for future development• We’ve played it safe on the database tier• Some limitations to what Gov can support• Contenders:

• Kinesis• Elastic search

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Configuration

Serverless means replying infrastructure with configurationDon’t underestimate the complexity

THE END

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@tobyhedetobyhede.com

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