Labels và selectors trong Kubernetes quan trọng thế nào?

Labels là key-value metadata gắn lên objects. Selectors cho Service, Deployment, NetworkPolicy hoặc kubectl chọn đúng objects. Nếu labels/selectors sai, Service không route traffic hoặc Deployment không quản lý Pods đúng.

Ví dụ:

metadata:
  labels:
    app: api
    tier: backend
spec:
  selector:
    matchLabels:
      app: api

Label taxonomy nên nhất quán từ đầu: app, component, version, environment, team.

Đừng dùng label tùy hứng cho routing/automation quan trọng.

Labels are key-value metadata attached to objects. Selectors let Services, Deployments, NetworkPolicies or kubectl choose the correct objects. If labels/selectors are wrong, a Service may not route traffic or a Deployment may not manage Pods correctly.

Example:

metadata:
  labels:
    app: api
    tier: backend
spec:
  selector:
    matchLabels:
      app: api

Keep label taxonomy consistent from the start: app, component, version, environment and team.

Avoid casual labels for critical routing/automation.