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Scheduled Retweets Using AWS Lambda
- 1. Auto Retweet UsingAWS Lambda Srushith R @SrushithR CodeOps Technologies Krishna Kishore (KK)
- 2. How will theapplication handle server hardware failure? How can I control Serversaccess from my servers? When should I decideto scale out my servers? When should I decideto scale up myservers? What size servers are right for my budget? How much remaining capacity do my servers have? (AAHHHHHHHHH!!) How will I keep my server OS patched? How many servers should I budget for? Content source: https://www.slideshare.net/AmazonWebServices/aws-reinvent-2016-getting-started-with- serverless-architectures-cmp211 2
- 3. • VMs • Machineas the unit of scale • Abstracts the hardware • Containers • Application as the unit of scale • Abstracts the OS • Serverless • Functions as the unit of scale • Abstracts the language runtime AWS Lambda Amazon ECS Amazon EC2 What is Serverless computing? Content source: https://www.slideshare.net/AmazonWebServices/aws-reinvent-2016- getting-started-with-serverless-architectures-cmp211 3
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- 5. Topics covered: AWS Lambda Overview Key features Working with Lambda Developing, deploying and testing on Lambda Demo Logging Benefits Use cases 5
- 6. Lambda: Overview AWSLambda is a serverless compute service that runs your code in response to events and automatically manages the underlying compute resources for you It executes your code only when needed and scales automatically, from a few requests per day to thousands per second 6 Content source: https://aws.amazon.com/documentation/
- 7. Lambda: Overview Youpay only for the compute time you consume - there is no charge when your code is not running With AWS Lambda, you can run code for virtually any type of application or backend service - all with zero administration 7 Content source: https://aws.amazon.com/documentation/
- 8. Lambda: Key features8 Extend Other AWS Services with Custom Logic Build Custom Back-end Services Completely Automated Administration Built-in Fault Tolerance Automatic Scaling Run Code at Edge Locations Integrated Security Model
- 9. Classical Architecture 9 Contentsource: https://blog.couchbase.com/serverless-faas-aws-lambda-java/
- 10. Serverless Architecture Content source:https://blog.couchbase.com/serverless-faas-aws-lambda-java/ 10
- 11. Lambda integrated with otherservices 11 Content source: https://www.slideshare.net/AmazonWebServices/aws-lambda-and-the-serverless-cloud
- 12. Triggers for Lambda12 Content source: https://www.slideshare.net/AmazonWebServices/aws-lambda-and-the-serverless-cloud
- 13. Working with Lambda13 Content source: https://aws.amazon.com/lambda/
- 14. Bring your owncode • Node.js, Java, Python • Bring your own libraries (even native ones) Simple resource model • Select power rating from 128 MB to 1.5 GB • CPU and network allocated proportionately • Reports actual usage Flexible authorization • Securely grant access to resources, including VPCs • Fine-grained control over who can call your functions Flexible use • Call or send events • Integrated with other AWS services • Build whole serverless ecosystems Using Lambda 14
- 15. Lambda execution environment 15 Linux kernelversion – 4.4.51- 40.60.amzn1.x86_64 Public Amazon Linux AMI version (AMI name: amzn- ami-hvm- 2016.03.3.x86_64-gp2) Image source: https://en.wikipedia.org/wiki/Linux_kernel
- 16. Lambda runtime Lambda supportsthe following runtime versions: 16 Node.js • v4.3.2 • v6.10.2 Java • Java 8 Python • Python 3.6 • Python 2.7 .NET Core • .NET Core 1.0.1 (C#) Note: If you are using any native binaries in your code, make sure they are compiled in this environment. Also note that only 64-bit binaries are supported on AWS Lambda
- 17. Three ways tocreate a Lambda function 17 Content source: https://aws.amazon.com/documentation/ Lambda AWS Lambda console (web User Interface) AWS SDK (Software Development Kit) AWS CLI (Command Line Interface)
- 18. Deploying you code18 There are three ways to deploy your code :
- 19. Logging in AWSLambda 19 Your Lambda function can contain logging statements. AWS Lambda writes these logs to CloudWatch. Logging can be done in two ways: Content source: https://aws.amazon.com/documentation/ Logging Print statements Language specific logging libraries
- 20. Amazon CloudWatch logs You can use Amazon CloudWatch Logs to monitor, store, and access your log files from AWS Lambda. You can then retrieve the associated log data from CloudWatch Logs Archive Log Data—You can use CloudWatch Logs to store your log data in highly durable storage 20 Content source: https://aws.amazon.com/documentation/
- 21. Accessing CloudWatch logs forlambda 21 Content source: https://www.slideshare.net/AmazonWebServices/aws-lambda-and-the-serverless-cloud
- 22. Lambda limits 22 Contentsource: http://docs.aws.amazon.com/lambda/latest/dg/limits.html
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- 24. Lambda use cases24 Content source: https://www.slideshare.net/AmazonWebServices/aws-lambda-and-the-serverless-cloud
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- 26. Python code sample26 The code is available in the github repo: https://github.com/CodeOpsTechnologies/Real_time_retweets Prerequisites for the zip file: 1. Python-twitter module: The module must be installed into a separate folder. Use the modified pip command: pip install --target <target folder path> python-twitter Note: The python code uses boto3 module, but installing it is not required as it is available as a default module in AWS Lambda
- 27. Steps to deploycode to Lambda 1. Create a zip file with the python code and dependency modules (python-twitter). 2. Create a Lambda function Upload the zip file Define environment variables and encrypt them 3. Create an event to schedule the lambda every one hour 27
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- 29. Encrypt Environment Variables29 Enable encryption to encrypt the environment variables choose an encryption key
- 30. Lambda function handler30 handler is of the format: <python code file name>.lambda_handler IAM role with logging permissions
- 31. Input to theLambda 31 twitter user name you want to retweet from (without ‘@’)
- 32. Schedule an event32 choose ‘rules’ under ‘events’ in CouldWatch select ‘schedule’
- 33. 33 schedule a fixedrate or as a cron expression Schedule an event
- 34. Select target Lambda34 select the target Lambda function
- 35. Pass the inputevent 35 select ‘constant’ and add the input event in JSON format
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- 39. Serverless Summit Join usat India’s first conference on serverless technologies! 39