探针探测对sts pod域名解析是否成功的影响

k8s 1.19.0

初始情况

apiVersion: v1
kind: Service
metadata:
  name: nginx
spec:
  ports:
  - port: 80
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx
spec:
  podManagementPolicy: Parallel
  serviceName: nginx
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.9.1

创建ClusterIP类型的service和StatefulSet之后，Pod域名可以直接解析。

10.16.0.17是coredns IP。

场景一：只增加readinessProbe

readinessProbe:
  httpGet:
    scheme: HTTP
    port: 80
  initialDelaySeconds: 300
  periodSeconds: 10
  timeoutSeconds: 1
  successThreshold: 1
  failureThreshold: 3

在readinessProbe检查成功之前，endpoint一直没有且Pod域名解析失败。

场景二：只增加livenessProbe

livenessProbe:
  httpGet:
    scheme: HTTP
    port: 80
  initialDelaySeconds: 60
  periodSeconds: 10
  timeoutSeconds: 1
  successThreshold: 1
  failureThreshold: 3

在livenessProbe检查成功之前，endpoint一直有且Pod域名解析成功。

场景三：只增加startupProbe

startupProbe:
  httpGet:
    scheme: HTTP
    port: 80
  initialDelaySeconds: 60
  periodSeconds: 10
  timeoutSeconds: 1
  successThreshold: 1
  failureThreshold: 3

在startupProbe检查成功之前，endpoint一直没有且Pod域名解析失败。