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Docker Compose Linter — AI Agent Skill | BytesAgain

📖 About This Skill

name: docker-compose-linter description: Lint docker-compose.yml files for security, best practices, and port conflicts. version: 1.0.0

docker-compose-linter

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

Commands

python3 scripts/docker-compose-linter.py  [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| no-version | info | Missing or outdated version: key | | no-healthcheck | warning | Service without healthcheck defined | | no-restart-policy | warning | Service without restart policy | |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)

💡 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

⚙️ Configuration

| 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) |