YAML Lint

Jan 1, 0001

Definition

YAML Lint is a tool used to validate YAML files for syntax errors and adherence to best practices. It helps ensure that YAML files are correctly formatted and free of common mistakes, such as incorrect indentation or invalid characters, which can lead to misconfigurations in applications that rely on YAML for configuration.

Secure Settings Example

# Example of a well-structured YAML configuration for a Kubernetes deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: secure-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: secure-app
  template:
    metadata:
      labels:
        app: secure-app
    spec:
      containers:
      - name: secure-app-container
        image: secure-app-image:latest
        ports:
        - containerPort: 80
        securityContext:
          runAsNonRoot: true
          readOnlyRootFilesystem: true

Insecure Settings Example

# Example of a poorly structured YAML configuration with potential security issues
apiVersion: apps/v1
kind: Deployment
metadata:
  name: insecure-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: insecure-app
  template:
    metadata:
      labels:
        app: insecure-app
    spec:
      containers:
      - name: insecure-app-container
        image: insecure-app-image:latest
        ports:
        - containerPort: 80
        securityContext:
          runAsNonRoot: false  # Allows running as root, which is insecure
          readOnlyRootFilesystem: false  # Filesystem is writable, increasing risk