DevOps & Sysadmin tools

Servers, containers, uptime, config. kodilo has 49 free DevOps & Sysadmin tools, including Uptime / SLA Calculator, Byte Size Converter, Transfer Time Calculator and Kubernetes Resource Units, and more. Every tool runs entirely in your browser, with no sign-up and no data sent to a server.

• Uptime / SLA CalculatorTurn 99.9% into allowed downtime per day, month and year, and back.
• Byte Size ConverterB, KB, KiB, MB, MiB, GB, GiB, TB, TiB: decimal and binary units side by side.
• Transfer Time CalculatorHow long a file takes to move over a given bandwidth, and the bandwidth a deadline needs.
• Kubernetes Resource UnitsCPU millicores and memory quantities (Mi, Gi, M, G) converted and explained.
• Kubernetes Manifest GeneratorDeployment, Service and Ingress YAML from a short form.
• .env ToolValidate, diff and convert .env files to JSON, docker -e flags or a Kubernetes Secret.
• YAML Validator & FormatterValidate YAML with line-precise errors, format it, convert it to JSON.
• Nginx Config GeneratorReverse proxy, static site, SPA fallback, HTTPS redirect and gzip in a few clicks.
• systemd Unit GeneratorService and timer units with restart policy, user, environment and hardening options.
• SSH Config GeneratorHost blocks for ~/.ssh/config with jump hosts, identity files and port forwarding.
• htpasswd Generatorbcrypt or SHA entries for Nginx and Apache basic auth.
• DNS Record BuilderSPF, DMARC, CAA and MX records built and explained, ready to paste.
• Security Headers BuilderContent-Security-Policy, HSTS, Permissions-Policy and friends, for Nginx, Apache or a meta tag.
• X.509 Certificate DecoderPaste a PEM certificate: subject, issuer, SANs, validity, fingerprints.
• SemVer CalculatorCompare versions and test ranges like ^1.2.0, ~2.3 or >=1 <2.
• .gitignore GeneratorCombine templates for languages, frameworks, editors and operating systems.
• JSON Log ViewerPaste structured logs, filter by level and field, read them as a table.
• curl ConverterTurn a curl command into fetch, axios, Python requests or HTTPie.
• Well-Known PortsSearchable reference of common TCP and UDP ports and the services behind them.
• Linux Signals & Exit CodesWhat SIGTERM, SIGKILL or exit code 137 actually mean.
• Redirect GeneratorWrite redirects once and get Nginx, Apache, Netlify, Vercel and Caddy rules.
• GitHub Actions Workflow GeneratorGenerate a CI workflow for Node, Python, Go, Docker or GitHub Pages with a version matrix, caching, least-privilege permissions and concurrency control.
• Dockerfile Generator & LinterGenerate a multi-stage Dockerfile with a non-root user, health check and .dockerignore, or lint an existing Dockerfile line by line.
• Docker Compose ValidatorValidate a compose file for YAML errors and semantic mistakes like bad ports, unknown services, undefined networks and volumes.
• Kubernetes Secret EncoderTurn key/value pairs or a .env file into a Secret manifest with UTF-8 safe base64, or decode an existing Secret.
• Caddyfile GeneratorBuild a Caddyfile with a reverse proxy or static site, www redirect, basic auth, security headers, compression and logging.
• Firewall Rule GeneratorDescribe your firewall rules once and get them as ufw commands, an iptables-save file or a complete nftables ruleset.
• Logrotate Config GeneratorBuild an /etc/logrotate.d file with schedule, compression, permissions and a reload script, then dry-run it with logrotate -d.
• fstab Entry GeneratorBuild a correct /etc/fstab line for disks, network shares, tmpfs and swap, with every field explained and common mistakes flagged.
• rsync Command BuilderBuild a safe rsync command for local or SSH copies, with excludes, bandwidth limits and a live explanation of the trailing slash rule.
• find Command BuilderCompose a find command from name, type, size, age, owner and permission filters, prune folders and pick an action.
• tar Command BuilderCreate, extract or list tar archives with gzip, bzip2, xz or zstd, and get the matching opposite command.
• GitLab CI GeneratorGenerate a modern .gitlab-ci.yml with stages, cache keyed on the lockfile, artifacts, rules, needs and a manual deploy job.
• Docker Command ExplainerPaste a docker command to see every flag explained in plain English, risky options flagged, and a host-to-container diagram of ports, mounts, network and env.
• Docker Compose VisualizerPaste a compose file to see its services, dependencies, networks, volumes and published ports as a diagram, with a plain-English summary of each service.
• Dockerfile Layer VisualizerPaste a Dockerfile to see its stages and layers, how stages copy from each other, and which layers a file change rebuilds.
• Docker Container LifecycleExplore the states a container goes through, the command behind every transition, the signals sent and what exit codes mean, then drive a demo container yourself.
• Cron Expression TesterDescribe a cron expression in plain English and list its next 10 run times in your timezone.
• Cron from Plain EnglishType a schedule in plain English and get the cron expression, broken down field by field.
• Terraform Plan VisualizerSee what a terraform plan will create, update, replace and destroy, grouped by resource with risky changes flagged
• Helm Values ConverterConvert a values.yaml into helm --set flags and back, with dots, commas, lists and strings escaped
• Nginx Location TesterFind which nginx location block matches a request URI and why, following the real matching order
• SSH Key FingerprintGet the type, size, SHA256 and MD5 fingerprints and comment of an OpenSSH public key
• IAM Policy VisualizerRead an AWS IAM or S3 bucket policy as allow and deny cards, with wildcard and public access risks flagged
• PromQL ExplainerBreak a PromQL query down step by step: selectors, ranges, functions, aggregations and vector matching
• iptables ExplainerRead iptables -L -n -v or iptables-save rules in plain English, chain by chain, with packet flow
• ps and top ExplainerExplain ps aux and top output: columns, process states and a sortable table of the heaviest processes
• Access Log AnalyzerAnalyze nginx and Apache access logs: status codes, top IPs and URLs, traffic chart, errors and bots.
• Cron to systemd TimerTurn a cron expression into systemd .timer and .service units, preview next runs, and convert OnCalendar back to cron.