---

name: container-scanner description: Scans containers and Dockerfiles for security issues. Wraps Hadolint for Dockerfile linting and Trivy for container image scanning. Use when user asks to "scan Dockerfile", "lint Dockerfile", "container security", "image scan", "Dockerセキュリティ", "コンテナスキャン".

Container Scanner

Wrapper for Hadolint and Trivy to scan Dockerfiles and container images.

Prerequisites

Copy# Hadolint (Dockerfile linting)
brew install hadolint
# or
docker pull hadolint/hadolint

# Trivy (container image scanning)
brew install trivy
# or
curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin

Usage

Copy# Lint Dockerfile
npx container-scanner lint Dockerfile

# Scan container image
npx container-scanner image nginx:latest

# Both operations with JSON output
npx container-scanner lint Dockerfile --json
npx container-scanner image myapp:v1 --json

# Check available tools
npx container-scanner --check

Hadolint Rules

Common Dockerfile best practices checked:

Output Format

Dockerfile Lint

Copy{
  "tool": "hadolint",
  "scanPath": "Dockerfile",
  "findings": [
    {
      "id": "DL3007",
      "severity": "warning",
      "line": 1,
      "message": "Using latest is prone to errors...",
      "file": "Dockerfile"
    }
  ],
  "summary": { "total": 1, "error": 0, "warning": 1, "info": 0 }
}

Image Scan

Copy{
  "tool": "trivy",
  "image": "nginx:latest",
  "findings": [
    {
      "id": "CVE-2024-1234",
      "severity": "critical",
      "package": "openssl",
      "installedVersion": "1.1.1",
      "fixedVersion": "1.1.2",
      "title": "Buffer Overflow"
    }
  ],
  "summary": { "total": 5, "critical": 1, "high": 2, "medium": 2 }
}

Exit Codes

• 0: No issues found
• 1: Issues detected
• 2: Tool not installed or error