Resources
Fast, practical reference — command cheat sheets, tool comparisons, and interview questions with answers.
Cheat sheets
Kuberneteskubectl cheat sheetEveryday kubectl — contexts, inspect, debug, apply, and rollouts.DockerDocker CLI cheat sheetDocker CLI for images, containers, Compose, and cleanup.LinuxLinux command cheat sheetCore Linux commands for files, processes, networking, and ops.TerraformTerraform cheat sheetTerraform workflow: init, plan, apply, state, and modules.AnsibleAnsible cheat sheetAnsible inventory, playbooks, Vault, roles, and ad-hoc modules.HelmHelm cheat sheetHelm repos, install/upgrade, values, charts, and rollback.GitGit cheat sheetGit staging, branching, remotes, rebase, undo, and stash.BashBash scripting cheat sheetBash scripting: safety flags, loops, functions, and traps.VaultHashiCorp Vault cheat sheetVault auth, KV secrets, policies, and dynamic engines.OPAOPA & Rego cheat sheetOPA and Rego: CLI, rules, testing, conftest, and Gatekeeper.KustomizeKustomize cheat sheetKustomize overlays, patches, generators, and components.Argo CDArgo CD cheat sheetArgo CD sync, rollback, projects, and ApplicationSets.GitLab CIGitLab CI/CD cheat sheetGitLab CI stages, rules, artifacts, secrets, and scanning.PythonPython for DevSecOps cheat sheetPython for DevSecOps: venvs, scanners, hashing, and tests.
Comparisons
CompareTerraform vs OpenTofuLicense, governance, CLI compatibility, and when to migrate.CompareHelm vs KustomizeTemplating vs overlays — packaging, rollback, and when to use each.CompareArgo CD vs FluxUI, multi-tenancy, Helm support, and which GitOps engine fits.CompareDocker vs PodmanDaemon vs daemonless — rootless security and Compose compatibility.CompareAnsible vs Chef vs PuppetAgent model, language, and which config tool still fits today.
Interview questions
KubernetesKubernetes interview questionsKubernetes interview Q&A — pods, networking, RBAC, scheduling, and control plane.DockerDocker interview questionsDocker interview Q&A — images, builds, networking, and container security.LinuxLinux interview questionsLinux interview Q&A for DevOps/SRE — permissions, processes, performance, and networking.TerraformTerraform interview questionsTerraform interview Q&A — state, modules, lifecycle, and secure CI for IaC.CI/CDCI/CD interview questionsCI/CD interview Q&A — pipelines, artifacts, deploy strategies, and securing delivery.GitOpsGitOps interview questionsGitOps interview Q&A — desired state, Argo CD, Flux, promotion, and multi-cluster.VaultVault & secrets interview questionsVault interview Q&A — auth, policies, dynamic secrets, transit, and Kubernetes integration.Policy as CodePolicy-as-code interview questionsPolicy-as-code interview Q&A — Rego, OPA, Conftest, Gatekeeper, and Kyverno.DevSecOpsDevSecOps & supply-chain security interview questionsDevSecOps interview Q&A — shift-left, scanning, SBOM, signing, and runtime defense.Observability & SREObservability & SRE interview questionsObservability and SRE interview Q&A — metrics, logs, traces, SLOs, and incidents.