DevOps

DevOps, Kubernetes and cloud.

31 lessons (116.5 h of study) and 42 interview problems: Linux, CI/CD, AWS, Terraform, Kubernetes, observability and SRE.

26 to study, 2 to skim, 3 for later 7 easy, 24 medium, 11 hard

Roadmap

Read the modules in order. Each lesson has a worked example, runnable code, interview questions and a quiz.

Jump to problems

Foundations

6 lessons · 21.5 h

#1StudyBeginner 2.5 hDevOps, SRE and platform engineering - how software reaches productionDevOps is a way of working that shortens the path from a code commit to a working change in production, and sends what production sees back to the people who wrote the code. This lesson explains what that means in practice, how the DevOps engineer, SRE and platform engineer roles differ, how the four DORA metrics measure delivery, what the 12-factor rules ask of an app, and how one change travels from a pull request to production and, if needed, back.Open lesson
#2StudyBeginner 4 hLinux for operatorsEvery container, every Kubernetes node and almost every CI runner is a Linux machine. This lesson is the operator's view of Linux: where files live, who may touch them, how processes are born and killed, how systemd keeps a service running, where logs go, and how to read disk, memory, CPU and load numbers when something is wrong. It ends with the kernel features (cgroups and namespaces) that containers are made of.Open lesson
#3StudyBeginner 3.5 hBash scripting and the terminal toolkitThe shell is the operator's first programming language and the glue of every CI job, Dockerfile and runbook. This lesson covers the model (three streams, exit codes, pipes), the text tools you chain together (grep, awk, sed, sort, uniq, cut, jq), how to write a bash script that does not break on a space or a missing variable, scheduling with cron and systemd timers, ssh, rsync and tmux, and the point where you should stop writing bash and switch to Python or Go.Open lesson
#4StudyBeginner 3.5 hNetworking for DevOps - TCP/IP, DNS, HTTP, TLS, SSHNetworking is the part of DevOps you cannot avoid: every outage ends with a packet that did not arrive, a name that did not resolve, or a certificate nobody renewed. This lesson covers the layers you actually debug (link, IP, TCP, TLS, HTTP), CIDR arithmetic with a real VPC plan, DNS end to end, the HTTP status codes operators care about, where TLS terminates, SSH and bastions, load balancers, security groups, and the eight tools that find the fault.Open lesson
#5StudyBeginner 3 hGit and trunk-based workflowsGit is the database every DevOps workflow is built on: application code, Terraform, Helm values, Kubernetes manifests and CI pipelines all live in it, and in GitOps a Git commit is the deploy. This lesson covers the Git model (snapshots, the DAG, branches as pointers), merge versus rebase versus squash, trunk-based development versus GitFlow, the pull request workflow, releases and hotfixes, bisect, hooks, monorepos, signed commits, and the ten Git situations that come up on call with the exact command for each.Open lesson
#6StudyIntermediate 5 hPython and Go for automation and toolingA DevOps engineer needs two languages. Python is for scripts, checks, data and glue between APIs: fast to write, already installed everywhere. Go is for anything that ships as a single binary, does many things at once, or lives in the CNCF world, where Kubernetes, Helm, Argo CD, Prometheus and Terraform are written. This lesson shows the shape of a good Python ops script, the one page of Go a Python person needs, the worker-pool pattern with channels and context, and the mistakes that make Go tools leak.Open lesson

Build and ship

4 lessons · 13.5 h

Cloud and IaC

4 lessons · 15.5 h

Kubernetes

5 lessons · 21 h

Operate

5 lessons · 20.5 h

Contribute

2 lessons · 11 h

Ship

2 lessons · 6.5 h

Later

3 lessons · 7 h

Interview problems

Each one has requirements, estimates, interfaces, design or diagnosis path, a diagram, deep dives, failure modes and follow-ups. Implement-it problems include a reference solution.

DESIGN

Platform design

· 20

CI/CD, Kubernetes platforms, multi-region AWS, observability and secrets: the design rounds for DevOps, SRE and platform roles.

OPS

Troubleshooting

· 12

Incident scenarios: pods that will not start, DNS failures, full disks, flaky pipelines. Diagnose, fix and prevent.

CODE

Implement it

· 10

Scripts, Dockerfiles, manifests, Terraform, Helm charts and a Go reconcile loop, written the way a reviewer expects.

DevOps, Kubernetes and cloud.

Roadmap

Foundations

Build and ship

Cloud and IaC

Kubernetes

Operate

Contribute

Ship

Later

Interview problems

Platform design

Troubleshooting

Implement it

Search

DevOps, Kubernetes and cloud.

Roadmap

Foundations

Build and ship

Cloud and IaC

Kubernetes

Operate

Contribute

Ship

Later

Interview problems

Platform design

Troubleshooting

Implement it