1.
Microservices and Serverless in
Python projects
José Manuel Ortega
Europython 2018
@jmortegac
v 0.5

2.
Agenda
•Microservices in python
•Introducing Serverless and Function as a Service
•Python frameworks for AWS
•AWS Lambda functions with zappa and chalice
•Deploy AWS lambda functions from aws
console
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3.
Microservices vs Serverless
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4.
Microservices
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5.
Asynchronous calls with asyncio and aiohttp
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6.
REST API Development
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7.
Performance
7Microservices and Serverless in Python projects
8% less memory
6% faster response times

8.
Microservices with graphql
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12.
12Microservices and Serverless in Python projects

13.
13Microservices and Serverless in Python projects
SERVER

14.
14Microservices and Serverless in Python projects
CLIENT

15.
Microservices benefits
•Separation of concerns
•Services are decoupled from each other
•Managing smaller projects
•More scaling and deployment options
15Microservices and Serverless in Python projects

16.
16Microservices and Serverless in Python projects
Serverless

17.
Serverless architecture
•FaaS - Function as a Service
•Fully managed computing
• Provisioning
• Scalability
• Monitoring
• Logging
•Deploy your code
•Pay only for actual usage
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18.
Serverless architecture
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19.
Serverless uses cases
➢ REST API
• Stateless services and microservices
• Suitable for Chat bots
➢ Events
• File processing (S3 event) & Data ingestion
• Data/Stream processing
• Incidents handling (CloudWatch event log)
• IoT
➢ Scheduled tasks
• Monitoring, load testing
• Periodical jobs
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20.
20Microservices and Serverless in Python projects

21.
Serverless benefits
•No server management
•Automatic scaling and load balancing
•Lower infrastructure costs
•Flexibility and high availability
•Infrastructure managed by service provider
21Microservices and Serverless in Python projects

22.
Serverless drawbacks
• The tools around the deployment automation of
serverless functions are still in development.
•There is no control over containers when the
execution environments are created or
destroyed
•Debugging, Deploying and monitoring
22Microservices and Serverless in Python projects

23.
Cloud providers
•AWS
•Microsoft Azure
•Cloud platform
•OpenWhisk(OS)
•Kubeless(OS)
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24.
Aws lambda
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25.
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26.
Aws lambda functions
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27.
Aws lambda functions
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28.
Create lambda function with awscli
28Microservices and Serverless in Python projects
$ aws lambda create-function
--region eu-west-1
--function-name MyHandler
--zip-file fileb://handler.zip
--role arn:aws:iam::XXX:role/MyLambdaRole
--vpc-config SubnetIds=XXX,SecurityGroupIds=XXX
--handler handler.handler
--runtime python3.6
--profile personal
--timeout 10
--memory-size 512

29.
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30.
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31.
Frameworks
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python-λ

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34.
Zappa architecture
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35.
Zappa
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39Microservices and Serverless in Python projects
# zappa_settings.json
{
"dev": {
"aws_region": "us-east-1",
"django_settings": "hello.settings",
"profile_name": "default",
"project_name": "hello",
"runtime": "python3.6",
"s3_bucket": "zappa-huyg6op0s"
}
}

40.
Zappa deploy
40Microservices and Serverless in Python projects
$ zappa deploy <env>
•Zips code and dependencies
•Create AWS Lambda and deploys the zip
•Creates endpoint on API Gateway and
links to AWS Lambda

41.
Zappa deploy
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42.
Zappa
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43.
Zappa Asynchronous Task
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44.
Chalice
44Microservices and Serverless in Python projects
•Python Serverless Microframework for AWS
•Each endpoint is a separate function

45.
Chalice
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46.
Chalice
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47.
Chalice example
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48.
Chalice methods
48Microservices and Serverless in Python projects
Resource HTTP Verb AWS Lambda
/talks GET get_talks
/talk POST add_new_talk
/talks/{ID} PUT update_talk
/talks/{ID} DELETE delete_talk

49.
Chalice methods
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50.
Chalice options
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51.
Chalice deploy
51Microservices and Serverless in Python projects
Updating IAM policy.
Updating lambda function...
Regen deployment package...
Sending changes to lambda.
API Gateway rest API already found.
Deploying to: dev

52.
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53.
https://github.com/lambci/docker-lambda
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54.
http://serverlesscalc.com/
54Microservices and Serverless in Python projects

55.
55Microservices and Serverless in Python projects

56.
https://github.com/serverless/examples
56Microservices and Serverless in Python projects

57.
References
57Microservices and Serverless in Python projects
•https://aws.amazon.com/blogs/compute/microservic
es-without-the-servers
•https://github.com/Miserlou/Zappa
•https://github.com/pmuens/awesome-serverless
•https://github.com/aws/chalice
•https://chalice.readthedocs.io/en/latest

58.
58Microservices and Serverless in Python projects
Serverless architecture is the
next generation of cloud
evolution

59.
Thank you!
José Manuel Ortega
jmortega.github.io