[Cloude] k8s - Label & LabelSelector

✔️ Label

레이블 확인

$ kubectl get pods --show-labels

$ kubectl get pods X -o yaml

$ kubectl describe pods X

레이블 관리

$ kubectl label pods myweb APP=apache

$ kubectl label pods myweb ENV=developments

$ kubectl label pods myweb ENV=staging

$ kubectl label pods myweb ENV=staging --overwirte

$ kubectl label pods myweb ENV-

✔️ LabelSelector

LabelSelector

• 검색
• 리소스 간 연결

일치성(equality base)

• =
• ==
• !=

$ kubectl get pods -l APP=nginx
$ kubectl get pods -l APP==nginx

$ kubectl get pods -l 'APP!=nginx'

집합성(set base)

• in
• notin
• exists: 키만 매칭
  - kubectl get pods -l 'APP'
• doesnotexists: 키 제외 매칭
  - kubectl get pods -l '!APP'

✔️ Annotations

레이블과 비슷
비 식별 메타데이타

명령형 커맨드

$ kubectl annotate pods myweb created-by=luna

$ kubectl annotate pods myweb created-by=Kim --overwrite

$ kubectl annotate pods myweb created-by-

YAML

apiVersion: v1
kind: Pod
metadata:
  name: myweb-label-anno
  labels:
    APP: apache
    ENV: staging
  annotations:
    Created-by: Jang
spec:
  containers:
    - name: myweb
      image: httpd
      ports:
        - containerPort: 80
          protocol: TCP