DynamoDB, Serverless Orchestration, Messaging & Database Selection Mid-Level SRE/DevOps/Platform Interview Notes 1. DynamoDB The Mental Model DynamoDB is a fully managed, serverless key-va...
DNS, Route 53, S3 (Additions), CloudFront & Global Accelerator Mid-Level SRE/DevOps/Platform Interview Notes 1. DNS Fundamentals — How Resolution Actually Works Why This Matters for SREs D...
Messaging, Containers & Serverless Mid-Level SRE/DevOps/Platform Interview Notes 1. SQS — Simple Queue Service The Core Mental Model SQS is a durable, distributed message queue. A producer...
AWS 1. IAM — Identity & Access Management Why IAM exists Every AWS API call — whether from your laptop, an EC2 instance, or a Lambda — must be authenticated (who are you?) and authorized (...
Motivation When I connect to a website, I see a padlock that says “Your connection is secure”. I have some idea about HTTP, HTTPS, SSL, TLS, public key, private key, certificates but I can’t conne...
Contents Motivation Namespaces and Cgroups Container Runtime Container vs VM Docker Docker Networking OverlayFS(and Docker) Image Layering and caching Persisting data with docke...
OverlayFS: concepts, conflicts, and whiteouts OverlayFS is a union filesystem in the Linux kernel. It lets you stack a writable layer on top of one or more read-only layers and present a single me...
Logs are the backbone of debugging, monitoring, and auditing in any Linux-based system. But if left unmanaged, log files can grow indefinitely, consume disk space, and even bring production systems...
Motivation On a local machine, applications often need to talk to each other to exchange information. For example, if I am building a user application around battery health, I might need informati...
Motivation Systemd is the successor of SysV in many on of the Linux based OS’es. The advantages of systemd over SysV are: Faster boot-up time since, daemons start paralelly as compared to sysV...