TIL

This is a collection of notes and remarks I have compiled about tech. Hopefully, this will prove useful when I want to look back at my tech knowledge.

17.10.2023

AWS CloudWatch Log groups can only have two subscriptions with filtering. So, if you need to trigger a Lambda function based on log containing a string, you would have to implement:

1. Create a CloudWatch metric based on a search pattern
2. Create a CloudWatch alarm based of the metric
3. Push notification to SNS on IN ALARM event
4. Create a Lambda function with SNS trigger
5. Query CloudWatch Logs from the function to get the log line that originally triggered that CloudWatch alarm

15.10.2023

nslookup and dscacheutil might produce different DNS lookup results on MacOS. This is related to the fact that nslookup does use MacOS DNS resolvers, while dscacheutil does.

12.10.2023

Not that many Docker images are built for arm v7 architecture. Thus, I have to rebuild every Docker image I want to use on my home lab Kubernetes cluster locally.