无法通过 minikube 上的主机名 ping 其他 pods

Question

我有一个有两个副本的 statefulSet。它的无头服务名称是 "gov-svc" 这是 ->

.metadata.name: sts
.metadata.namespace: 默认
.spec.serviceName：gov-svc
.spec.template.spec.subdomain：gov-svc
.spec.replicas: 2

在运行 statefulSet

之前

kubectl get pods --all-namespaces
NAMESPACE     NAME                                    READY   STATUS             RESTARTS   AGE
kube-system   coredns-99b9bb8bd-qdnsb                 1/1     Running            0          4h
kube-system   etcd-minikube                           1/1     Running            0          4h
kube-system   kube-addon-manager-minikube             1/1     Running            0          4h
kube-system   kube-apiserver-minikube                 1/1     Running            0          4h
kube-system   kube-controller-manager-minikube        1/1     Running            1          4h
kube-system   kube-proxy-b9np6                        1/1     Running            0          4h
kube-system   kube-scheduler-minikube                 1/1     Running            0          4h
kube-system   kubernetes-dashboard-7db4dc666b-bsk8k   1/1     Running            0          4h
kube-system   storage-provisioner

在这个 statefulSet 的运行两个 pods 之后，来自 pod sts-0，ping 结果：

$ ping  sts-0.gov-svc.default.svc.cluster.local
PING sts-0.gov-svc.default.svc.cluster.local (172.17.0.11): 56 data bytes
64 bytes from 172.17.0.11: seq=0 ttl=64 time=0.051 ms
64 bytes from 172.17.0.11: seq=1 ttl=64 time=0.444 ms
^C
--- redis-cluster-exp-0-0.redis-cluster-exp.default.svc.cluster.local ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.051/0.247/0.444 ms

但是当我尝试从 sts-0 到 ping sts-1 时，它说：

$ ping sts-1.gov-svc.default.svc.cluster.local
ping: bad address 'sts-1.gov-svc.default.svc.cluster.local'

我需要通过主机名成功 ping 通其他 pods。我该怎么做？

Answer 1

您需要创建 headless service 才能在 StatefulSet 中相互 ping 副本。类似于：

apiVersion: v1
kind: Service
metadata:
  name: gov-svc-headless
  labels:
    your_label: your_value
spec:
  selector:
    your_label: your_value
  ports:
  - port: your_port
    name: transport
    protocol: TCP
  clusterIP: None <---

注：

With selectors For headless services that define selectors, the endpoints controller creates Endpoints records in the API, and modifies the DNS configuration to return A records (addresses) that point directly to the Pods backing the Service.

注：

or headless services that do not define selectors, the endpoints controller does not create Endpoints records. However, the DNS system looks for and configures either:

CNAME records for ExternalName-type services. A records for any Endpoints that share a name with the service, for all other types.

更多信息：https://kubernetes.io/docs/concepts/services-networking/service/#headless-services

无法通过 minikube 上的主机名 ping 其他 pods

Can't ping other pods by hostname on minikube

kubernetes

kube-dns

minikube

kubernetes-statefulset

kubernetes-pod