DevOps practices, CI/CD, and automation
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The average cost of a data breach hit $4.88 million in 2024, and the average time to detect one was 194 days. DevSecOps aims to flip this by embedding security into every stage of the development lifecycle — not as a gate at the end, but as a continuous practice from the first line of code.
Docker isn't magic — here's how to build a container with just Linux commands. Containers are nothing more than regular Linux processes with three layers of isolation: namespaces (what a process can see), cgroups (what a process can use), and a changed root filesystem (where a process lives). Once you understand these primitives, Kubernetes networking, Docker storage drivers, and container security all start making sense.
The fastest way to create a security incident is to deploy infrastructure that was never reviewed for misconfigurations. A public S3 bucket, an open security group, an unencrypted RDS instance — these are not sophisticated attacks. They are configuration mistakes that tools can catch automatically. Security scanning for Terraform has matured to the point where there is no excuse for skipping it.
Netflix famously runs a tool called Chaos Monkey that randomly kills production servers — on purpose. It sounds insane until you realize their systems survived the 2017 AWS S3 outage while half the internet went down. That's chaos engineering: deliberately injecting failure so your systems learn to handle it gracefully.
A pod crashes at 3 AM, restarts, and by the time you check in the morning, kubectl logs shows only the current container's output — the crash logs are gone forever. Kubernetes does not persist logs beyond the lifetime of a container, and on a busy cluster, even node-level logs rotate away within hours. If you are not shipping logs to a central store, you are debugging with one eye closed.
Default kernel settings are for laptops — here's how to tune for production. Every Linux server ships with conservative defaults designed for general-purpose use. If you're running a web server handling thousands of concurrent connections, a database, or a Kubernetes node, those defaults are actively hurting you.