Ganz ohne Server: Betreiben hockskalierbarer
Microservices mit AWS Lambda
Oliver Arafat, Enterprise Evangelist AWS
@OliverArafat
Microservices Webday
Agenda
• A simple problem, a complicated solution
• What is AWS Lambda?
• Pricing
• Common Use-Cases
• Demo
Simple Problem:
Let’s make a microservice to thumbnail an image as soon as it’s uploaded
into a repository.
• Provision a fleet of proxy machines to capture
uploads.
• For each upload, enqueue a job to process it.
• Provision a second fleet of machines to read and
process jobs.
• Pick a deployment solution.
• Plan capacity, accounting for fault tolerance, good
long-term utilization, burst capability, etc.
• Monitor 24x7x365 for capacity, health, security, etc.
• Migrate to new instance types over time, keeping OS
and language runtimes patched and up to date.
What if there was a better way?
Please meet AWS Lambda.
What if every AWS service generated events…?
PUT
COPY
UPDATE
DELETE
RESTORE
Amazon
S3
… and you could respond to them easily?
Event-Driven Compute
– Stateless, request-driven code called Lambda
functions
– Triggered by events in other services:
• S3
• DynamoDB Streams
• Amazon Kinesis Streams
• Amazon SNS
• Amazon Cognito
• CloudTrail Audit Logs
AWS Lambda: Hello World!
// import any 3rd party library you want
exports.handler = function(event, context) {
context.succeed(‘Hello ’ + event.param);// context.fail('Something went wrong');
};
Push Event Model
• Unordered model
• 3 retries
Pull Event Model
• Ordered model with multiple records per event
• Unlimited retries (until data expires)
No Infrastructure to Manage
Focus on business logic, not infrastructure.
Just upload your code; AWS Lambda handles:
Capacity
Scaling
Deployment
Fault tolerance
Monitoring
Logging
Web service front end
Security patching
Automatic scaling
• Each event becomes a Lambda request
(hands free delivery)• For example, each object uploaded to Amazon S3
is an event
• Lambda scales to match the event rate
• You can’t over or under provision
• You pay only for what they use
Bring your own code (BYOC)
• Create threads and processes
• Run batch scripts or other executables
• Read/write files in /tmp
• Include any library with a Lambda
function code, even native libraries
Intelligent Infrastructure
• Turn storage services like Amazon S3 and
Amazon Dynamo into dynamic, reactive services.
• Attach code to a stream so that it can
automatically aggregate or transform data
flowing through.
• Cost effectively add even small amounts of code,
like audit checks, where you need them.
Amazon EC2/ECS
• Hourly infrastructure rental
• Flexible – choose your OS
and instance type
• DIY fault tolerance
• Scale by provisioning
more instances
• Any code, any language
Comparing AWS Compute Offerings
AWS Lambda
• Request-driven
• Simple – shared OS,
AWS-owned infrastructure
• Built-in fault tolerance
• Scale by sending more requests
• Stateless Node.js and Java code
Pricing
Fine-grained pricing
• Compute time is charged by 100ms, so even short jobs make sense
• Low per request charge
• No hourly, daily, or monthly minimums
• Free tier
Pricing Example (1)
Total Charges = Compute Charges + Request Charges
Compute Charges:
• First 1 million requests per month are free
• $0.20 per 1 million requests thereafter ($0.0000002 per request)
Request Charges:
• $0.00001667 for every GB-second
Pricing Example (2)
If you allocated 128MB of memory to your function,
executed it 30 million times in one month, and it ran for 200ms each time,
your charges would be calculated as follows:
Total compute (seconds) = 30M * (0.2sec) = 6,000,000 seconds
Total compute (GB-s) = 6,000,000 * 128MB/1024 = 750,000 GB-s
Total Compute – Free tier compute = Monthly billable compute seconds
750,000 GB-s – 400,000 free tier GB-s = 350,000 GB-s
Monthly compute charges = 350,000 * $0.00001667 = $5.83
30M requests – 1M free tier requests = 29M Monthly billable requests
Monthly request charges = 29M * $0.2/M = $5.80
Total charges = Compute charges + Request charges = $5.83 + $5.80 = $11.63 per month
Common Use Cases
Data Triggers: Amazon S3
Amazon S3 Bucket Events AWS Lambda
Original image Thumbnailed image
1
2
3
Data Triggers: DynamoDB
AWS Lambda
DynamoDB
Table and Stream
Send Amazon SNS
notifications
Update another table
Audit and Notify
AWS API calls
AWS CloudTrail Logs
AWS Lambda
Bucket events Amazon SNS
notifications
Custom Events
AWS Lambda
Serverless Microservices
AWS Lambda
API Gateway
Demo
Migrating a NODE.JS Service to AWS Lambda
Migrating a NODE.JS Service to AWS Lambda
Migrating a NODE.JS Service to AWS Lambda
AWS Free Tier
aws.amazon.com/free
Thank you!
Questions?
Oliver Arafat, Enterprise Evangelist AWS
@OliverArafat
Microservices Webday
