Serverless

How I created a simple activity logger with AWS Serverless to record nuisance activities of my neighbor

NOTE: This post is originally published at dev.to Intro This is how I created a simple activity logger with AWS API Gateway direct integrations with DynamoDB to record some nuisance activities of one of the neighbors. There are few activities he does which annoy us, such as door slam, punch to the wall, and walking with klomps which make a heavy sound. He is not corporating, so before going for further actions, I wanted to keep track of when he does those activities.

How I created a 'physical' alarm to warn me when my servers are down

NOTE: This post is originally published at dev.to This post contains a weekend project I worked on to create an alarm when my AWS EC2 servers are down. Tools and technologies used: AWS Lambda, EventBridge, Greengrass, Raspberry Pi, Active Buzzer and LED light (as the alarm), GPIO, etc. Architecture: How it works: When an EC2 is stopped or terminated, EventBridge will capture the event. EventBrige will trigger the Lambda function (PublishToIotCloud) which publish a message to IOT cloud with the topic ‘alarm’.

How I created a door bell with AWS Serverless

NOTE: This post is originally published at dev.to Intro Recently, there was a hackathon at my work place, Wonderkind, and with one of my colleagues, I created a intelligent door bell with AWS Serverless services + a raspberry pi. Whenever someone clicks on the button of the ‘door bell’, it will capture a image and check through a Amazon Rekognition faces collection to see if the faces on the image are already indexed.

Whitelisting Lambda IP

Recently, one of my friend/client came up with the scenario below. Scenario: There is a lambda function, which calls to a external API and fetch some data. This external API only accepts incoming requests only from pre-configured whitelisted IPs. As per today, AWS doesnt’ support elastic IPs for Lambda. However, there is a simple work around. Solution: Simple solution is, to create the lambda function within a VPC and make the 3rd party API to be accessible via a NAT gateway.

Understanding Lambda Concurrency

Lambda by nature is highly scalable. However there ares some limitations you need to consider when there are lot of Lambda functions run simultaneously. Please note: This will not applicable for all the scenarios, but for a system with a high throughput. Account Level Concurrent Execution Limit As at now, Lambda has a soft limit of 1000 concurrent executions per region. Which means, at any given moment, sum of lambda executions running belongs to all of your lambda functions in a single region must be less than 1000.