K8中某个服务内的Envoy Pod到Pod通信 [英] Envoy Pod to Pod communication within a Service in K8

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问题描述

配置Envoy时是否可以向Kubernetes中属于同一服务的另一个K8 Pod发送http Rest请求?

Is it possible to send a http Rest request to another K8 Pod that belongs to the same Service in Kubernetes when Envoy is configured?

重要:我还有一个问题

Important : I have another question here that directed me to ask with Envoy specific tags.

E. G. 服务名称= UserService，2个Pod(副本= 2)

E. G. Service name = UserService , 2 Pods (replica = 2)

Pod 1 --> Pod 2 //using pod ip not load balanced hostname 
Pod 2 --> Pod 1

连接已超过Rest GET 1.2.3.4:7079/user/1

The connection is over Rest GET 1.2.3.4:7079/user/1

主机+端口的值取自kubectl get ep

两个Pod IP的工作都在Pod之外成功完成，但是当我对Pod进行kubectl exec -it并通过CURL发出请求时，它会返回未为端点找到的404.

Both of the pod IP's work successfully outside of the pods but when I do a kubectl exec -it into the pod and make the request via CURL, it returns a 404 not found for the endpoint.

问，我想知道是否可以向同一服务中的另一个K8 Pod发出请求? 回答:这绝对有可能.

Q What I would like to know if it is possible to make a request to another K8 Pod that is in the same Service? Answered : this is definitely possible.

Q 为什么我可以成功获得ping 1.2.3.4却不能使用Rest API?

Q Why am I able to get a successful ping 1.2.3.4, but not hit the Rest API?

Q 配置Envoy时是否可以直接从另一个Pod请求Pod IP?

Q is it possible to directly request a Pod IP from another Pod when Envoy is configured?

因为我是K8的完整初学者，所以请让我知道需要哪些配置文件或需要进行输出.谢谢.

Please let me know what config files are needed or output is needed to progress, as I am a complete beginner with K8. Thanks.

以下是我的配置文件 

 #values.yml
replicaCount: 1

 image:
  repository: "docker.hosted/app"
  tag: "0.1.0"
  pullPolicy: Always
  pullSecret: "a_secret"

service:
 name: http
 type: NodePort
 externalPort: 7079
 internalPort: 7079

ingress:
 enabled: false

deployment.yml 

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: {{ template "app.fullname" . }}
  labels:
    app: {{ template "app.name" . }}
    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
    release: {{ .Release.Name }}
    heritage: {{ .Release.Service }}
spec:
  replicas: {{ .Values.replicaCount }}
  template:
    metadata:
      labels:
        app: {{ template "app.name" . }}
        release: {{ .Release.Name }}
    spec:
      containers:
        - name: {{ .Chart.Name }}
          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
          imagePullPolicy: {{ .Values.image.pullPolicy }}
          env:

            - name: MY_POD_IP
              valueFrom:
               fieldRef:
                fieldPath: status.podIP
            - name: MY_POD_PORT
              value: "{{ .Values.service.internalPort }}"
          ports:
            - containerPort: {{ .Values.service.internalPort }}
          livenessProbe:
            httpGet:
              path: /actuator/alive
              port: {{ .Values.service.internalPort }}
            initialDelaySeconds: 60
            periodSeconds: 10
            timeoutSeconds: 1
            successThreshold: 1
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /actuator/ready
              port: {{ .Values.service.internalPort }}
          initialDelaySeconds: 60
          periodSeconds: 10
          timeoutSeconds: 1
          successThreshold: 1
          failureThreshold: 3
          resources:
{{ toYaml .Values.resources | indent 12 }}
    {{- if .Values.nodeSelector }}
      nodeSelector:
{{ toYaml .Values.nodeSelector | indent 8 }}
    {{- end }}
      imagePullSecrets:
        - name: {{ .Values.image.pullSecret }

service.yml 

kind: Service
metadata:
  name: {{ template "app.fullname" . }}
  labels:
    app: {{ template "app.name" . }}
    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
    release: {{ .Release.Name }}
    heritage: {{ .Release.Service }}
spec:
  type: {{ .Values.service.type }}
  ports:
    - port: {{ .Values.service.externalPort }}
      targetPort: {{ .Values.service.internalPort }}
      protocol: TCP
      name: {{ .Values.service.name }}
  selector:
    app: {{ template "app.name" . }}
    release: {{ .Release.Name }}

从主人处执行

"kubectl get -o yaml部署"的输出 

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "1"
  creationTimestamp: 2019-01-29T20:34:36Z
  generation: 1
  labels:
    app: msg-messaging-room
    chart: msg-messaging-room-0.0.22
    heritage: Tiller
    release: msg-messaging-room
  name: msg-messaging-room
  namespace: default
  resourceVersion: "25447023"
  selfLink: /apis/extensions/v1beta1/namespaces/default/deployments/msg-messaging-room
  uid: 4b283304-2405-11e9-abb9-000c29c7d15c
spec:
  progressDeadlineSeconds: 600
  replicas: 2
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: msg-messaging-room
      release: msg-messaging-room
  strategy:
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: msg-messaging-room
        release: msg-messaging-room
    spec:
      containers:
      - env:
        - name: KAFKA_HOST
          value: confluent-kafka-cp-kafka-headless
        - name: KAFKA_PORT
          value: "9092"
        - name: MY_POD_IP
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: status.podIP
        - name: MY_POD_PORT
          value: "7079"
        image: msg-messaging-room:0.0.22
        imagePullPolicy: Always
        livenessProbe:
          failureThreshold: 3
          httpGet:
            path: /actuator/alive
            port: 7079
            scheme: HTTP
          initialDelaySeconds: 60
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 1
        name: msg-messaging-room
        ports:
        - containerPort: 7079
          protocol: TCP
        readinessProbe:
          failureThreshold: 3
          httpGet:
            path: /actuator/ready
            port: 7079
            scheme: HTTP
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 1
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      imagePullSecrets:
      - name: secret
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
status:
  availableReplicas: 2
  conditions:
  - lastTransitionTime: 2019-01-29T20:35:43Z
    lastUpdateTime: 2019-01-29T20:35:43Z
    message: Deployment has minimum availability.
    reason: MinimumReplicasAvailable
    status: "True"
    type: Available
  - lastTransitionTime: 2019-01-29T20:34:36Z
    lastUpdateTime: 2019-01-29T20:36:01Z
    message: ReplicaSet "msg-messaging-room-6f49b5df59" has successfully progressed.
    reason: NewReplicaSetAvailable
    status: "True"
    type: Progressing
  observedGeneration: 1
  readyReplicas: 2
  replicas: 2
  updatedReplicas: 2

"kubectl get -o yaml svc $ the_service"的输出 

apiVersion: v1
kind: Service
metadata:
  creationTimestamp: 2019-01-29T20:34:36Z
  labels:
    app: msg-messaging-room
    chart: msg-messaging-room-0.0.22
    heritage: Tiller
    release: msg-messaging-room
  name: msg-messaging-room
  namespace: default
  resourceVersion: "25446807"
  selfLink: /api/v1/namespaces/default/services/msg-messaging-room
  uid: 4b24bd84-2405-11e9-abb9-000c29c7d15c
spec:
  clusterIP: 1.2.3.172.201
  externalTrafficPolicy: Cluster
  ports:
  - name: http
    nodePort: 31849
    port: 7079
    protocol: TCP
    targetPort: 7079
  selector:
    app: msg-messaging-room
    release: msg-messaging-room
  sessionAffinity: None
  type: NodePort
status:
  loadBalancer: {}

推荐答案

我在另一个问题上发布的内容是，我在安装服务之前禁用了Istio注入，然后在安装服务后重新启用了它，现在一切正常.对我有用的命令是:

What I posted on another question was , I disabled Istio injection before installing the service and then re enabled it after installing the service and now its all working fine, so the commands that worked for me were:

这篇关于K8中某个服务内的Envoy Pod到Pod通信的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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