Lessons from developers who went serverless

#todayilearned #serverless #architecture

TL;DR style notes from articles I read today.

API server on serverless leads to automatic scalability, high availability and reduces costs dramatically.
Deploying a Lambda function has a 52Mb limitation. Mitigate this by including only the required dependencies and trimming their size by excluding unused files.
For background jobs such as file processing, keep a set of dedicated Lambda functions that are not part of the API server.
A good approach to logging is to stream the Lambda logs into a dedicated Lambda that is responsible for sending it to the 3rd party logging service.
When it comes to environment variables, don’t commit your secrets to source control.

Full post here, 6 mins read

Ditch Python, switch over to Node. It makes everything much more maintainable and logical.
The middle layer has to go. It acts as a web server on Lambda, which is both wrong and terrible.
Try Vue when dealing with messy code. Vue compiles all your goodness into an index.html and bundle.js files, primed for uploading to S3.
Learn to love DynamoDB. When you get it right, the NoSQL database provides blistering performance, massive scale, and practically no administrative overheads.
Serverless Frameworks are awesome. A simple sls deploy wields enormous power, bundling up your code and shipping it directly to AWS Lambda.
Authorization is king and JWT makes all other types of auth look overcomplicated.

Full post here, 10 mins read

Serverless works well with a microservice-style architecture. You should limit the scope of services and functions you use.
Lambda functions shouldn’t persist any data or session information in the environment beyond the lifetime of a single request.
However, Lambda might reuse your function instances to make performance optimizations. So, you should optimise for your functions for reuse.
Cold starts are a problem with AWS Lambda. Reduce latency by keeping containers warm.
Use dependency injection to make your functions easily testable. Write integration tests, both locally and on deployments.

Full post here, 6 mins read