Kubernetes PetSet DNS无效

Question

我有一个名为== elasticsearch和serviceName == 的Kubernetes PetSet es.它确实创建了pod,并且正如预期的那样,它们的名称elasticsearch-0和elasticsearch-1.但是,DNS似乎不起作用.elasticsearch-0.es不解决(也不解决elasticsearch-0.default).如果你查看生成的srv记录,它们似乎是随机的而不是可预测的:

# nslookup -type=srv elasticsearch
Server:        10.1.0.2
Address:    10.1.0.2#53

elasticsearch.default.svc.cluster.local    service = 10 100 0 9627d60e.elasticsearch.default.svc.cluster.local.

有人有主意吗？

---

细节

这是实际的PetSet和服务定义:

---
apiVersion: v1
kind: Service
metadata:
  name: elasticsearch
  labels:
    app: elasticsearch
spec:
  ports:
  - name: rest
    port: 9200
  - name: native
    port: 9300
  clusterIP: None
  selector:
    app: elasticsearch
---
apiVersion: apps/v1alpha1
kind: PetSet
metadata:
  name: elasticsearch
spec:
  serviceName: "es"
  replicas: 2
  template:
    metadata:
      labels:
        app: elasticsearch
      annotations:
        pod.alpha.kubernetes.io/initialized: "true"
    spec:
      terminationGracePeriodSeconds: 0
      containers:
      - name: elasticsearch
        image: 672129611065.dkr.ecr.us-west-2.amazonaws.com/elasticsearch:v1
        ports:
          - containerPort: 9200
          - containerPort: 9300
        volumeMounts:
        - name: es-data
          mountPath: /usr/share/elasticsearch/data
        env:
          - name: POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          - name: ES_CLUSTER_NAME
            value: EsEvents
  volumeClaimTemplates:
  - metadata:
      name: es-data
      annotations:
        volume.alpha.kubernetes.io/storage-class: anything
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 10Gi

Answer 1

这是我误读文档的问题.文档说:

网络标识有两部分.首先,我们创建了一个无头服务,控制我们创建Pets的域.此服务管理的域采用以下形式:$(服务名称).$(名称空间).svc.cluster.local,其中"cluster.local"是集群域.当每个宠物被创建时,它获得匹配的DNS子域,采用以下形式:$(petname).$(管理服务域),其中管理服务由宠物集上的serviceName字段定义.

我认为这意味着该serviceDomain字段的值是"管理服务域"的值,但这并不意味着它.这意味着值serviceDomain必须与现有无头服务的名称匹配,并且该服务将用作管理服务域.如果不存在此类服务,则不会出现错误 - 您只需为您的宠物获取随机DNS名称.