Docker Compose Linter

Lint docker-compose.yml files for security, best practices, and port conflicts.

A pure Python 3 (stdlib only) linter for docker-compose.yml files.

Commands

python3 scripts/docker-compose-linter.py <command> [options] FILE

Command	Description
lint	Lint a docker-compose.yml for issues
services	List all services with their images/builds
ports	List all port mappings, detect conflicts
audit	Full audit (lint + services + ports summary)

Options

Option	Description
--format text|json|markdown	Output format (default: text)
--strict	Exit 1 on any issue (not just errors)
--ignore RULE	Ignore a specific rule (repeatable)
--min-severity error|warning|info	Minimum severity to report (default: info)

Lint Rules

Rule	Severity	Description
no-version	info	Missing or outdated version: key
no-healthcheck	warning	Service without healthcheck defined
no-restart-policy	warning	Service without restart policy
privileged-mode	error	Service running in privileged mode
port-conflict	error	Multiple services mapping to same host port
host-network	warning	Using network_mode: host (security risk)
latest-tag	warning	Image using :latest tag or no tag
no-resource-limits	info	No memory/CPU limits (deploy.resources)
hardcoded-env	warning	Secrets/passwords directly in environment variables
root-user	warning	No user: specified (runs as root by default)
missing-depends-on	info	Service uses links but no depends_on
bind-mount-relative	info	Relative bind mount paths
no-logging	info	No logging configuration
duplicate-service	error	Duplicate service names

Examples

# Lint with default text output
python3 scripts/docker-compose-linter.py lint docker-compose.yml

# Only show errors and warnings
python3 scripts/docker-compose-linter.py --min-severity warning lint docker-compose.yml

# JSON output for CI pipelines
python3 scripts/docker-compose-linter.py --format json lint docker-compose.yml

# Full audit in markdown
python3 scripts/docker-compose-linter.py --format markdown audit docker-compose.yml

# Ignore specific rules
python3 scripts/docker-compose-linter.py --ignore root-user --ignore no-logging lint docker-compose.yml

# Strict mode: exit 1 on any issue
python3 scripts/docker-compose-linter.py --strict lint docker-compose.yml

Requirements

• Python 3.7+
• No external dependencies (pure stdlib)