# 04 — devops toolbox
Practical utilities for developers, DevOps engineers, cloud engineers and SREs — generators, validators and calculators that run entirely in your browser.
two tools call public read-only APIs (DNS-over-HTTPS, SSL Labs) — clearly labelled on their pages; every other tool is fully client-side.
Container builds, compose stacks and registry debugging.
Production Dockerfiles for 12 runtimes: multi-stage, pinned bases, non-root, healthchecks.
🐳 Dockeropen toolBuild multi-service stacks interactively and export a valid compose.yaml.
🐳 Dockeropen toolAssemble docker run lines from flags: ports, mounts, env, restart policy.
🐳 Dockeropen toolSplit or assemble registry/image references and sanity-check tags.
🐳 Dockeropen toolhadolint-style static checks: pinning, layer hygiene, root user, secrets.
🐳 Dockeropen toolRegistry failures decoded: denied, manifest unknown, exits, ports, disk, cache.
🐳 Dockeropen toolOrchestration utilities: validate, generate, convert, debug.
Structural lint of Deployments, Pods and Services before you apply them.
☸️ Kubernetesopen toolSane-default Deployment + Service manifests: probes, limits, rolling updates.
☸️ Kubernetesopen toolMultiply pod requests by replicas; convert CPU and memory units safely.
☸️ Kubernetesopen toolCompose exact kubectl commands: verbs, resources, namespaces, output flags.
☸️ Kubernetesopen toolRound-trip config snippets between YAML and JSON without leaving the tab.
☸️ Kubernetesopen toolCrashLoops, ImagePull errors, Pending pods and friends — with diagnostics.
☸️ Kubernetesopen toolIAM policies, ARNs and cloud-init, computed locally.
Least-privilege IAM policy documents with ARN validation built in.
☁️ Cloud / AWSopen toolDecode arn:partition:service:region:account:resource strings, or assemble them.
☁️ Cloud / AWSopen toolNoCloud user-data: hostname, packages, SSH keys, runcmd — valid YAML.
☁️ Cloud / AWSopen toolPipeline skeletons and schedule math that keep delivery boring.
Starter workflows with caching and least-privilege permissions baked in.
🔄 CI / CDopen toolStarter .gitlab-ci.yml: stages, caching, rules and registry jobs.
🔄 CI / CDopen toolFive-field cron with next-run preview in your local timezone.
🔄 CI / CDopen toolValidate versions against semver.org and compare two releases.
🔄 CI / CDopen toolDNS, TLS, ports, IPs and HTTP semantics on hand.
Query A, AAAA, MX, TXT, NS, CNAME records via DNS-over-HTTPS.
🌐 Networkingopen toolSplit any URL into protocol, host, port, path and query parameters.
🌐 Networkingopen toolSubnet math: masks, ranges, broadcast, usable hosts and child splits.
🌐 Networkingopen toolWell-known ports with service names and transport, filterable.
🌐 Networkingopen toolLive certificate grade and handshake report via SSL Labs.
🌐 Networkingopen toolMethod, headers, body and flags assembled into a copyable curl command.
🌐 Networkingopen toolEvery status code that matters, grouped, filtered and explained.
🌐 Networkingopen toolSecrets hygiene, tokens, hashes and strong credentials.
Cryptographically random passwords with entropy readout — offline.
🔐 Securityopen toolFind AWS keys, tokens, private keys and leaked creds in pasted text.
🔐 Securityopen toolDecode header/payload claims and flag expiry — signature unverified.
🔐 Securityopen toolSHA-1/256/384/512 digests via the Web Crypto API, unicode-safe.
🔐 Securityopen toolEveryday converters, formatters and testers.
Pretty-print, minify or deep-sort JSON with error positions.
🧰 Utilitiesopen toolRe-indent, normalise and deep-sort YAML via the toolbox YAML engine.
🧰 Utilitiesopen toolUnicode-safe Base64 and percent encoders/decoders.
🧰 Utilitiesopen toolLive match highlighting, capture groups and flag toggles.
🧰 Utilitiesopen toolUnix seconds/millis ↔ ISO 8601 and local time, with relative labels.
🧰 Utilitiesopen toolRFC 4122 v4 UUIDs from crypto.getRandomValues, batch-generatable.
🧰 Utilitiesopen toolGregorian ↔ Bikram Sambath conversion for 2000–2100 BS.
🧰 Utilitiesopen toolno tools matched — try another keyword or clear the filter