Hands-on

spec:
  topologySpreadConstraints:
    - maxSkew: 1
      topologyKey: topology.kubernetes.io/zone
      whenUnsatisfiable: DoNotSchedule
      labelSelector:
        matchLabels: { app: checkout }
  affinity:
    podAntiAffinity:
      preferredDuringSchedulingIgnoredDuringExecution:
        - weight: 100
          podAffinityTerm:
            topologyKey: kubernetes.io/hostname
            labelSelector:
              matchLabels: { app: checkout }

apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: checkout-pdb
spec:
  minAvailable: 2
  selector:
    matchLabels: { app: checkout }

kubectl drain node-3 --ignore-daemonsets --delete-emptydir-data
# "Cannot evict pod as it would violate the pod's disruption budget" 가 뜨면 정상 동작 중

apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
  name: checkout
spec:
  replicas: 10
  strategy:
    canary:
      steps:
        - setWeight: 10
        - pause: { duration: 5m }
        - setWeight: 50
        - pause: { duration: 10m }
        - setWeight: 100

kubectl argo rollouts get rollout checkout --watch
kubectl argo rollouts abort checkout   # 비정상 지표 감지 시 즉시 롤백

apiVersion: chaos-mesh.org/v1alpha1
kind: PodChaos
metadata:
  name: kill-one-replica
spec:
  action: pod-kill
  mode: one
  duration: "30s"
  selector:
    namespaces: ["payments"]
    labelSelectors:
      app: checkout

# 1) readinessProbe 설정 확인 — 없으면 Pod가 뜨는 즉시 Ready로 간주됨
kubectl get deploy checkout -o jsonpath='{.spec.template.spec.containers[0].readinessProbe}'

# 2) terminationGracePeriodSeconds와 preStop hook 확인
kubectl get deploy checkout -o jsonpath='{.spec.template.spec.terminationGracePeriodSeconds}'

# 3) 배포 중 엔드포인트 변화를 실시간 관찰
kubectl get endpoints checkout -w

lifecycle:
  preStop:
    exec:
      command: ["sh", "-c", "sleep 5"]
terminationGracePeriodSeconds: 30