docker-compose-linter
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no-version | info | Missing or outdated version: key |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)