Kubernetes PetSet DNS 不工作

Question

我有一个 Kubernetes PetSet，名称 == elasticsearch 和 serviceName == es。它确实创建了 pods，并且正如预期的那样，它们的名称如 elasticsearch-0 和 elasticsearch-1。但是，DNS 似乎不起作用。 elasticsearch-0.es 不解析（elasticsearch-0.default 也不解析，等等）。如果您查看生成的 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.

有人有什么想法吗？

详情

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。 The docs 说：

The network identity has 2 parts. First, we created a headless Service that controls the domain within which we create Pets. The domain managed by this Service takes the form: $(service name).$(namespace).svc.cluster.local, where “cluster.local” is the cluster domain. As each pet is created, it gets a matching DNS subdomain, taking the form: $(petname).$(governing service domain), where the governing service is defined by the serviceName field on the Pet Set.

我的意思是serviceDomain字段的值是"governing service domain"的值，但不是这个意思。这意味着 serviceDomain 的值必须与现有无头服务的名称相匹配，并且该服务将用作管理服务域。如果不存在此类服务，您不会收到错误 - 您只是为您的宠物获取随机 DNS 名称。

Kubernetes PetSet DNS 不工作

Kubernetes PetSet DNS not working

kubernetes

kube-dns