Question 1

Why is the top-level 'version' attribute deprecated in modern Compose?

Accepted Answer

Historically, Docker Compose used versions 1, 2, and 3 with differing feature flags. In 2020, Docker donated the specification to the open-source Compose Specification project. Docker Compose v2 merges all capabilities into a unified spec, making the top-level version field obsolete and informational.

Question 2

How does port collision detection work?

Accepted Answer

When two or more services publish to the same host port (e.g. "8080:3000" and "8080:80" ) on the same interface or wildcard 0.0.0.0 , Docker cannot bind both sockets. Our validator scans all port definitions, extracts host binding IPs and protocol types, and flags conflicts before deployment.

Question 3

What is the difference between Named Volumes and Bind Mounts?

Accepted Answer

Named volumes (e.g., db_data:/var/lib/mysql ) are managed directly by Docker inside host storage areas, survive container restarts, and must be declared in top-level volumes: . Bind mounts (e.g., ./nginx.conf:/etc/nginx/nginx.conf ) map directly to an arbitrary file or directory on your host machine.

Question 4

Are my Docker Compose files and infrastructure secrets kept private?

Accepted Answer

Yes, 100%. In accordance with ToolsAA privacy policies, all YAML parsing, AST evaluation, port matching, and security auditing occur entirely inside your local browser runtime. Zero bytes are uploaded to external APIs or remote logging servers.

Docker Compose File Validator & Linter — Guia de referência

Parâmetros principais e controles

Dicas profissionais e melhores práticas

Host Port Allocation & Collision Inspector

Storage & Volume Mounts Explorer

Service Container Topology & Health

Problemas comuns e solução de problemas

Unexpected output or validation warning in Docker Compose File Validator & Linter

Exported docker compose validator online result differs across target environments

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