Serverless
on AWS
What, why, how in less than 10 slides
Serverless doesn't mean no servers.
You just don't have to worry about them.
Bare
Metal
VMs
App. Servers
Serverless
Hetzner
DigitalOcean
Heroku
AWS Lambda
/**
* This is an example of a controller aka handler.
*/
module.exports.handler = async function registerUserHandler(event, context, callback) {
const { name, email, country } = event.body; // This is raw input directly from a client
const userId = await db.save({ name, email, country });
events.emit(USER_REGISTERED, userId);
callback(null, {
statusCode: 200,
headers: {},
body: {
success: true,
response: { userId, name, email, country }
}
})
}
$ curl -X POST \
-D '{\"name\":\"Kostas\",\"email\":\"konmpar@gmail.com\",\"country\":\"GR\"}' \
https://a.domain.com/users
/**
* Response:
*
* {
* success: true,
* response: {
* userId: 321,
* name: "Kostas",
* email: "konmpar@gmail.com",
* country: "GR"
* }
* }
*/
service: serverless-example
provider:
name: aws
runtime: nodejs4.3
environment:
DYNAMODB_TABLE: ${self:service}-${opt:stage, self:provider.stage}
functions:
create:
handler: users/register.handler
events:
- http:
path: users
method: post
cors: true
resources:
Resources:
UsersDynamoDbTable:
Type: 'AWS::DynamoDB::Table'
DeletionPolicy: Retain
Properties:
AttributeDefinitions:
-
AttributeName: id
AttributeType: S
KeySchema:
-
AttributeName: id
KeyType: HASH
ProvisionedThroughput:
ReadCapacityUnits: 1
WriteCapacityUnits: 1
TableName: ${self:provider.environment.DYNAMODB_TABLE}
Infrastructure based on events
* API Gateway
* DynamoDB record change
* S3 file contents change
* Time change (cron)
* Plus much more
All these can trigger a Lambda Function
Pros:
* Cost effective
* Auto-scaling
* Many many many things out of the box
Cons:
* Vendor lock-in
* Not exactly simpler
* Development experience is
kostasbariotis.com
I'm
Thank you!
😎
serverless-on-aws
By Kostas Bariotis
serverless-on-aws
What, why, how in less than 10 slides
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