Resources
Fast, practical reference for working engineers: command cheat sheets, tool comparisons for real decisions, and interview questions with answers.
14 cheat sheets · 5 comparisons · 10 interview guides (516 questions) · checked against current stable releases on · How these are maintained
Cheat sheets14
- Kubernetes · Cheat sheetkubectl cheat sheetEveryday kubectl — contexts, inspect, debug, apply, and rollouts.89 commands · 9 sections
- Docker · Cheat sheetDocker CLI cheat sheetDocker CLI for images, containers, Compose, and cleanup.79 commands · 9 sections
- Linux · Cheat sheetLinux command cheat sheetCore Linux commands for files, processes, networking, and ops.118 commands · 13 sections
- Terraform · Cheat sheetTerraform cheat sheetTerraform workflow: init, plan, apply, state, and modules.56 commands · 9 sections
- Ansible · Cheat sheetAnsible cheat sheetAnsible inventory, playbooks, Vault, roles, and ad-hoc modules.63 commands · 9 sections
- Helm · Cheat sheetHelm cheat sheetHelm repos, install/upgrade, values, charts, and rollback.52 commands · 9 sections
- Git · Cheat sheetGit cheat sheetGit staging, branching, remotes, rebase, undo, and stash.64 commands · 10 sections
- Bash · Cheat sheetBash scripting cheat sheetBash scripting: safety flags, loops, functions, and traps.64 commands · 9 sections
- Vault · Cheat sheetHashiCorp Vault cheat sheetVault auth, KV secrets, policies, and dynamic engines.59 commands · 7 sections
- OPA · Cheat sheetOPA & Rego cheat sheetOPA and Rego: CLI, rules, testing, conftest, and Gatekeeper.47 commands · 6 sections
- Kustomize · Cheat sheetKustomize cheat sheetKustomize overlays, patches, generators, and components.44 commands · 6 sections
- Argo CD · Cheat sheetArgo CD cheat sheetArgo CD sync, rollback, projects, and ApplicationSets.56 commands · 8 sections
- GitLab CI · Cheat sheetGitLab CI/CD cheat sheetGitLab CI stages, rules, artifacts, secrets, and scanning.50 commands · 8 sections
- Python · Cheat sheetPython for DevSecOps cheat sheetPython for DevSecOps: venvs, scanners, hashing, and tests.49 commands · 7 sections
Comparisons5
- Terraform & OpenTofu · ComparisonTerraform vs OpenTofuLicence, S3 locking, state encryption, migration risk, and which to run.2 tools · decision guide
- Kubernetes · ComparisonHelm vs KustomizeTemplates or overlays, release history, CRD handling, the two hybrids, and which to use when.2 tools · decision guide
- GitOps & delivery · ComparisonArgo CD vs FluxOperating model, sync defaults, tenancy, Helm and secrets, and which fits your team.2 tools · decision guide
- Containers · ComparisonDocker vs PodmanDaemon or none, rootless limits, restart policies vs Quadlet, the socket, Compose, and where "drop-in" stops.2 tools · decision guide
- Configuration management · ComparisonAnsible vs Chef vs PuppetPush or pull, run cadence and drift, server components, 2026 licensing, and which model fits which fleet.3 tools · decision guide
Interview prep10
- Kubernetes · Interview guideKubernetes interview questionsKubernetes interview Q&A — pods, networking, RBAC, scheduling, and control plane.66 questions · Beginner to Expert
- Docker · Interview guideDocker interview questionsDocker interview Q&A — images, builds, networking, and container security.51 questions · Beginner to Expert
- Linux · Interview guideLinux interview questionsLinux interview Q&A for DevOps/SRE — permissions, processes, performance, and networking.51 questions · Beginner to Expert
- Terraform · Interview guideTerraform interview questionsTerraform interview Q&A — state, modules, lifecycle, and secure CI for IaC.52 questions · Beginner to Expert
- CI/CD · Interview guideCI/CD interview questionsCI/CD interview Q&A — pipelines, artifacts, deploy strategies, and securing delivery.52 questions · Beginner to Expert
- GitOps · Interview guideGitOps interview questionsGitOps interview Q&A — desired state, Argo CD, Flux, promotion, and multi-cluster.50 questions · Beginner to Expert
- Vault · Interview guideVault & secrets interview questionsVault interview Q&A — auth, policies, dynamic secrets, transit, and Kubernetes integration.45 questions · Beginner to Expert
- Policy as Code · Interview guidePolicy-as-code interview questionsPolicy-as-code interview Q&A — Rego, OPA, Conftest, Gatekeeper, and Kyverno.47 questions · Beginner to Expert
- DevSecOps · Interview guideDevSecOps & supply-chain security interview questionsDevSecOps interview Q&A — shift-left, scanning, SBOM, signing, and runtime defense.51 questions · Beginner to Expert
- Observability & SRE · Interview guideObservability & SRE interview questionsObservability and SRE interview Q&A — metrics, logs, traces, SLOs, and incidents.51 questions · Beginner to Expert
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Kubernetes
kubectl, packaging with Helm and Kustomize, and the cluster questions interviews probe.
Containers
Docker and Podman day to day, image hygiene, and container isolation.
Terraform & OpenTofu
Terraform and OpenTofu day to day, state safety, imports, and the licence split.
Configuration management
Ansible in practice, and how it compares with Chef and Puppet for fleet configuration.
GitOps & delivery
Argo CD and Flux, and how Helm and Kustomize feed a reconciler.
CI/CD & supply chain
Git and GitLab CI in practice, pipeline security, signing and SBOMs.
Secrets management
Vault operations, dynamic credentials, and keeping secrets out of Git and logs.
Policy as code
OPA and Rego, admission control with Gatekeeper and Kyverno, and IaC scanning.
Linux & scripting
Linux operations and troubleshooting, Bash that fails loudly, Python for security tooling.
Observability & SRE
Metrics, logs, traces, alerting that pages for the right reasons, and SLOs.
DevSecOps
Scanning, signing, runtime detection, and the security questions senior interviews ask.