Docker Compose, healthchecks, cron and operational configuration for local environments. The tools run in your browser and the examples link to real-stack guides.
Built for students, IT folks, devops and engineers who run services locally with Docker Compose, schedule tasks with cron and need to validate configuration before copying it into a repository. It is not a marketing landing: it is an operational starting point that connects each tool with the guide explaining the real use case.
Every utility processes your configuration in the browser. The YAML you generate or validate is never sent to a server. You can confirm it by opening DevTools on the Network tab while you use each tool.
The two core pieces of a local DevOps flow: defining services with Docker Compose and scheduling when tasks run.
Docker Compose generator and validator with 8 presets, a healthcheck builder and practical linting on the compose.yaml you paste.
Unix/POSIX cron expression generator with Quartz and AWS dialects, a next-runs preview and dialect warnings.
Secondary within the flow: useful for reviewing structured configuration before pasting it, without competing with the two main tools.
Each flow links the tool that solves it with the guide that explains the detail and the errors it avoids.
Define PostgreSQL with a persistent volume, a pg_isready healthcheck and the password in .env.example, without exposing the port to the Internet.
Connect pgAdmin to the database by the service name and bind it to localhost so it is not left open.
Place Nginx in front of your app with an internal network and proxy_pass to the service name, and learn to diagnose a 502.
Build the cron expression for backups, cleanups or reports and confirm the frequency with the next runs.
Review healthchecks and depends_on, and check that the YAML or JSON is well formed before pasting it into the repository.
A library of real stacks explained, from a basic healthcheck to monitoring. Each guide includes the compose.yaml, the safe ports and the specific error it avoids.
How to write correct per-service healthchecks, use depends_on with condition: service_healthy, manage secrets with .env.example and avoid exposing database ports.
A Docker Compose example library by stack (Postgres, Redis, Nginx, Node, WordPress, Prometheus + Grafana) with a comparison table, healthchecks, safe ports and the real error each one avoids.
A working PostgreSQL compose.yaml with a persistent volume, pg_isready healthcheck, .env.example and the key commands, plus why changing the password fails if you keep the old volume.
PostgreSQL with pgAdmin: connect the panel to the database by service name, bind it to localhost, .env.example and why exposing pgAdmin to the Internet is a bad idea.
A Redis compose.yaml with requirepass, AOF persistence, a redis-cli healthcheck and a localhost-bound port, plus why a Redis with no AUTH and an open port gets compromised in minutes.
A Node.js app and its PostgreSQL database in the same Compose, using depends_on and condition: service_healthy to avoid ECONNREFUSED on startup, migrations and dev vs production.
Put an app behind Nginx: internal network, proxy_pass to the service name, healthcheck and how to diagnose a 502 Bad Gateway. Includes when to use Traefik or Caddy instead.
WordPress with MariaDB locally: two volumes (database and files with your uploads), .env.example, a MariaDB healthcheck and how to fix the database connection error.
Prometheus and Grafana locally: prometheus.yml, volumes for the data, connecting Grafana to Prometheus by service name, and what this stack monitors and what it does not.
The recurring failures when running services locally. The tools and guides above are designed to keep you from hitting them.
Inside a service, localhost is the container itself, not the host or another service. Services connect to each other by name on the Compose network.
Publishing the Postgres or Redis port as 5432:5432 opens it on every interface. Bind it to 127.0.0.1 when you only need it locally.
depends_on waits for the container to start, not for the service to be ready. Without condition: service_healthy you will see ECONNREFUSED on startup.
Passwords written into the compose.yaml end up in the repository. Use variables with .env and version only a .env.example with no real values.
latest changes without warning and breaks reproducible builds. Pin a specific image version so the stack stays stable.
A cron that runs at 2:00 does so in the system or container timezone. Verify the timezone before trusting the time.
A quick pass before calling a local stack done.
| Item | What to check |
|---|---|
| Named volume | Data persists across restarts and does not land in an anonymous volume. |
| Real healthcheck | Each critical service checks that it is ready, not just that it started. |
| Ports on 127.0.0.1 | What you publish locally is bound to loopback, not every interface. |
| .env out of git | You version .env.example with no values; the real .env is in .gitignore. |
| Pinned image version | No :latest; a specific tag for reproducible builds. |
| Logs and verification | You know which command shows logs and confirms the service responds. |
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