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Today I Learned

Short learnings from real engineering

Small things I learn while building. Not blog posts — just concise notes on gotchas, patterns, and surprises I encounter day-to-day.

6 entries5 categories

🐳Docker🐹Go☸️Kubernetes☁️AWS🐘PostgreSQL

🐳DockerFeb 15, 2025

Docker layer cache order matters — put COPY last

#docker#dockerfile#caching#devops

🐹GoFeb 10, 2025

Go defer inside a loop doesn't run until the function returns

#go#defer#loops#gotchas

☸️KubernetesFeb 01, 2025

Kubernetes: liveness vs readiness probes are not the same thing

#kubernetes#k8s#probes#devops

☁️AWSJan 25, 2025

AWS S3 now provides strong read-after-write consistency

#aws#s3#consistency#cloud

🐘PostgreSQLJan 18, 2025

PostgreSQL: JSONB is almost always better than JSON

#postgres#json#jsonb#database

🐹GoJan 10, 2025

Go maps are not safe for concurrent reads and writes

#go#concurrency#maps