Started this journey on Jan 28, 2026. I committed to spend atleast 4 hours dedicating to it. This will run till April 28, 2026. Today is Feb 15, 2026, I have missed 3-4 days of studying. Maintainin...

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...

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...

Q: What is bash? A: bash is a unix shell and scripting language generally used in linux based OS to interact with kernel. Q: What is shell? A: It is an optional user-level program that provides a...

Motivation These days I spend my time on learning and exploring tools around k8s. I have access to company’s k8s cluster but I can’t break the cluster while experimenting. I have some free credits...

tree To see the hierarchy of a directory. less To open a scrollable pager of a file. head To see the first n lines of a file. # first n lines head -n 10 file.txt # first c chars head -c 10 f...

Motivation: Why Authorization Matters Kubernetes is fundamentally an API-driven system. Every action such as creating a Pod, reading a Secret, scaling a Deployment is an API request to the kube-ap...