spring boot - Unable to connect to service in same namespace in kubernetes

I have 2 apps. One is config-server and other is business-logic-app that consumes data from config-server. Both are running on same namespace in Kubernetes (kubectl on my laptop). However, am getting connection timed out exception when business-logic-app is connecting to config-server which is leading to livenessProbe and readinessProbe failures. What am I missing?

config-server.yaml

# Config server
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kubernetes-learning-config-server
  namespace: kubernetes-learning
  labels:
    app: kubernetes-learning-config-server
spec:
  replicas: 2
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  selector:
    matchLabels:
      app: kubernetes-learning-config-server
  template:
    metadata:
      name: kubernetes-learning-config-server
      labels:
        app: kubernetes-learning-config-server
    spec:
      containers:
        - name: kubernetes-learning-config-server
          image: ghcr.io/kubernetes/learning.config-server
          imagePullPolicy: Always
          ports:
            - containerPort: 8888
              protocol: TCP
            - containerPort: 48888
              protocol: TCP
          env:
            - name: BPL_JVM_THREAD_COUNT
              value: "50"
            - name: BPL_DEBUG_ENABLED
              value: "true"
            - name: BPL_DEBUG_PORT
              value: "48888"
            - name: GITHUB_CONFIG_DATA_URL
              value: 
            - name: GITHUB_CONFIG_DATA_USERNAME
              value: github_user
            - name: GITHUB_CONFIG_DATA_PERSONAL_ACCESS_TOKEN
              value: github_sampletoken  
          livenessProbe:
            httpGet:
              path: /alpha-app/local
              port: 8888
            initialDelaySeconds: 30
            periodSeconds: 20
            timeoutSeconds: 10
            successThreshold: 1
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /alpha-app/local
              port: 8888
            initialDelaySeconds: 30
            periodSeconds: 20
            timeoutSeconds: 10
            successThreshold: 1
            failureThreshold: 3

      restartPolicy: Always

# Expose Config server
---
apiVersion: v1
kind: Service
metadata:
  name: kubernetes-learning-config-server
  labels:
    app: kubernetes-learning-config-server
spec:
  type: ClusterIP
  selector:
    app: kubernetes-learning-config-server
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8888

alpha-app.yaml

# app applications
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kubernetes-learning-app
  namespace: kubernetes-learning
  labels:
    app: kubernetes-learning-app
spec:
  replicas: 1
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  selector:
    matchLabels:
      app: kubernetes-learning-app
  template:
    metadata:
      name: kubernetes-learning-app
      labels:
        app: kubernetes-learning-app
    spec:
      containers:
        - name: kubernetes-learning-alpha-app
          image: ghcr.io/kubernetes/learning.alpha-app
          imagePullPolicy: Always
          ports:
            - containerPort: 8441
              protocol: TCP
            - containerPort: 48441
              protocol: TCP
          env:
            - name: BPL_JVM_THREAD_COUNT
              value: "50"
            - name: BPL_DEBUG_ENABLED
              value: "true"
            - name: BPL_DEBUG_PORT
              value: "48441"
            - name: SPRING_PROFILES_ACTIVE
              value: kube
            - name: SPRING_CLOUD_CONFIG_FAIL_FAST
              value: "true"
            - name: SPRING_CLOUD_CONFIG_RETRY_INITIAL_INTERVAL
              value: "1000"
            - name: SPRING_CLOUD_CONFIG_RETRY_MAX_INTERVAL
              value: "10000"
            - name: SPRING_CLOUD_CONFIG_RETRY_MULTIPLIER
              value: "2"
            - name: SPRING_CLOUD_CONFIG_RETRY_MAX_ATTEMPTS
              value: "5"
            - name: SPRING_CLOUD_CONFIG_URI
              value: http://kubernetes-learning-config-server:8888
          livenessProbe:
            httpGet:
              path: /info
              port: 8441
            initialDelaySeconds: 60
            timeoutSeconds: 15
            periodSeconds: 30
            successThreshold: 1
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /info
              port: 8441
            initialDelaySeconds: 60
            timeoutSeconds: 15
            periodSeconds: 30
            successThreshold: 1
            failureThreshold: 3

      restartPolicy: Always


# Expose Config server
---
apiVersion: v1
kind: Service
metadata:
  name: kubernetes-learning-app
  labels:
    app: kubernetes-learning-app
spec:
  type: ClusterIP
  selector:
    app: kubernetes-learning-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8441

exception

Caused by: .springframework.web.client.ResourceAccessException: I/O error on GET request for "http://kubernetes-learning-config-server:8888/alpha-app/kube": Connect timed out
    at .springframework.web.client.RestTemplate.createResourceAccessException(RestTemplate.java:926) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.web.client.RestTemplate.doExecute(RestTemplate.java:906) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.web.client.RestTemplate.execute(RestTemplate.java:801) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.web.client.RestTemplate.exchange(RestTemplate.java:683) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.cloud.config.client.ConfigServerConfigDataLoader.getRemoteEnvironment(ConfigServerConfigDataLoader.java:349) ~[spring-cloud-config-client-4.2.0.jar:4.2.0]
    at .springframework.cloud.config.client.ConfigServerConfigDataLoader.doLoad(ConfigServerConfigDataLoader.java:130) ~[spring-cloud-config-client-4.2.0.jar:4.2.0]
    ... 37 common frames omitted
Caused by: java.SocketTimeoutException: Connect timed out
    at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(Unknown Source) ~[na:na]
    at java.base/sun.nio.ch.NioSocketImpl.connect(Unknown Source) ~[na:na]
    at java.base/java.Socket.connect(Unknown Source) ~[na:na]
    at java.base/sun.NetworkClient.doConnect(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.openServer(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.openServer(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.<init>(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.New(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.New(Unknown Source) ~[na:na]
    at java.base/sun.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source) ~[na:na]
    at java.base/sun.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source) ~[na:na]
    at java.base/sun.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source) ~[na:na]
    at java.base/sun.www.protocol.http.HttpURLConnection.connect(Unknown Source) ~[na:na]
    at .springframework.http.client.SimpleClientHttpRequest.executeInternal(SimpleClientHttpRequest.java:79) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.http.client.AbstractStreamingClientHttpRequest.executeInternal(AbstractStreamingClientHttpRequest.java:71) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:81) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.web.client.RestTemplate.doExecute(RestTemplate.java:900) ~[spring-web-6.2.1.jar:6.2.1]
    ... 41 common frames omitted

config-server.yaml

# Config server
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kubernetes-learning-config-server
  namespace: kubernetes-learning
  labels:
    app: kubernetes-learning-config-server
spec:
  replicas: 2
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  selector:
    matchLabels:
      app: kubernetes-learning-config-server
  template:
    metadata:
      name: kubernetes-learning-config-server
      labels:
        app: kubernetes-learning-config-server
    spec:
      containers:
        - name: kubernetes-learning-config-server
          image: ghcr.io/kubernetes/learning.config-server
          imagePullPolicy: Always
          ports:
            - containerPort: 8888
              protocol: TCP
            - containerPort: 48888
              protocol: TCP
          env:
            - name: BPL_JVM_THREAD_COUNT
              value: "50"
            - name: BPL_DEBUG_ENABLED
              value: "true"
            - name: BPL_DEBUG_PORT
              value: "48888"
            - name: GITHUB_CONFIG_DATA_URL
              value: https://github/kubernetes/config-data
            - name: GITHUB_CONFIG_DATA_USERNAME
              value: github_user
            - name: GITHUB_CONFIG_DATA_PERSONAL_ACCESS_TOKEN
              value: github_sampletoken  
          livenessProbe:
            httpGet:
              path: /alpha-app/local
              port: 8888
            initialDelaySeconds: 30
            periodSeconds: 20
            timeoutSeconds: 10
            successThreshold: 1
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /alpha-app/local
              port: 8888
            initialDelaySeconds: 30
            periodSeconds: 20
            timeoutSeconds: 10
            successThreshold: 1
            failureThreshold: 3

      restartPolicy: Always

# Expose Config server
---
apiVersion: v1
kind: Service
metadata:
  name: kubernetes-learning-config-server
  labels:
    app: kubernetes-learning-config-server
spec:
  type: ClusterIP
  selector:
    app: kubernetes-learning-config-server
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8888

alpha-app.yaml

# app applications
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kubernetes-learning-app
  namespace: kubernetes-learning
  labels:
    app: kubernetes-learning-app
spec:
  replicas: 1
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  selector:
    matchLabels:
      app: kubernetes-learning-app
  template:
    metadata:
      name: kubernetes-learning-app
      labels:
        app: kubernetes-learning-app
    spec:
      containers:
        - name: kubernetes-learning-alpha-app
          image: ghcr.io/kubernetes/learning.alpha-app
          imagePullPolicy: Always
          ports:
            - containerPort: 8441
              protocol: TCP
            - containerPort: 48441
              protocol: TCP
          env:
            - name: BPL_JVM_THREAD_COUNT
              value: "50"
            - name: BPL_DEBUG_ENABLED
              value: "true"
            - name: BPL_DEBUG_PORT
              value: "48441"
            - name: SPRING_PROFILES_ACTIVE
              value: kube
            - name: SPRING_CLOUD_CONFIG_FAIL_FAST
              value: "true"
            - name: SPRING_CLOUD_CONFIG_RETRY_INITIAL_INTERVAL
              value: "1000"
            - name: SPRING_CLOUD_CONFIG_RETRY_MAX_INTERVAL
              value: "10000"
            - name: SPRING_CLOUD_CONFIG_RETRY_MULTIPLIER
              value: "2"
            - name: SPRING_CLOUD_CONFIG_RETRY_MAX_ATTEMPTS
              value: "5"
            - name: SPRING_CLOUD_CONFIG_URI
              value: http://kubernetes-learning-config-server:8888
          livenessProbe:
            httpGet:
              path: /info
              port: 8441
            initialDelaySeconds: 60
            timeoutSeconds: 15
            periodSeconds: 30
            successThreshold: 1
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /info
              port: 8441
            initialDelaySeconds: 60
            timeoutSeconds: 15
            periodSeconds: 30
            successThreshold: 1
            failureThreshold: 3

      restartPolicy: Always


# Expose Config server
---
apiVersion: v1
kind: Service
metadata:
  name: kubernetes-learning-app
  labels:
    app: kubernetes-learning-app
spec:
  type: ClusterIP
  selector:
    app: kubernetes-learning-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8441

exception

Caused by: .springframework.web.client.ResourceAccessException: I/O error on GET request for "http://kubernetes-learning-config-server:8888/alpha-app/kube": Connect timed out
    at .springframework.web.client.RestTemplate.createResourceAccessException(RestTemplate.java:926) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.web.client.RestTemplate.doExecute(RestTemplate.java:906) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.web.client.RestTemplate.execute(RestTemplate.java:801) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.web.client.RestTemplate.exchange(RestTemplate.java:683) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.cloud.config.client.ConfigServerConfigDataLoader.getRemoteEnvironment(ConfigServerConfigDataLoader.java:349) ~[spring-cloud-config-client-4.2.0.jar:4.2.0]
    at .springframework.cloud.config.client.ConfigServerConfigDataLoader.doLoad(ConfigServerConfigDataLoader.java:130) ~[spring-cloud-config-client-4.2.0.jar:4.2.0]
    ... 37 common frames omitted
Caused by: java.SocketTimeoutException: Connect timed out
    at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(Unknown Source) ~[na:na]
    at java.base/sun.nio.ch.NioSocketImpl.connect(Unknown Source) ~[na:na]
    at java.base/java.Socket.connect(Unknown Source) ~[na:na]
    at java.base/sun.NetworkClient.doConnect(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.openServer(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.openServer(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.<init>(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.New(Unknown Source) ~[na:na]
    at java.base/sun.www.http.HttpClient.New(Unknown Source) ~[na:na]
    at java.base/sun.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source) ~[na:na]
    at java.base/sun.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source) ~[na:na]
    at java.base/sun.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source) ~[na:na]
    at java.base/sun.www.protocol.http.HttpURLConnection.connect(Unknown Source) ~[na:na]
    at .springframework.http.client.SimpleClientHttpRequest.executeInternal(SimpleClientHttpRequest.java:79) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.http.client.AbstractStreamingClientHttpRequest.executeInternal(AbstractStreamingClientHttpRequest.java:71) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:81) ~[spring-web-6.2.1.jar:6.2.1]
    at .springframework.web.client.RestTemplate.doExecute(RestTemplate.java:900) ~[spring-web-6.2.1.jar:6.2.1]
    ... 41 common frames omitted

Share Improve this question asked Feb 3 at 17:56 JMD 3394 silver badges17 bronze badges

That worked, thank you. Interestingly this did not work with MongoDB and so I have appended port number for MongoDB. I thought it would be same for config-server. For config-server, what you mentioned did the trick. – JMD Commented Feb 4 at 15:03

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1 Answer 1

Sorted by: Reset to default 1

That is because the service is listening on port 80 that will be routed to port 8888 on the target pods.

ports:
  - protocol: TCP
    port: 80
    targetPort: 8888

Therefore, you need to point kubernetes-learning-app to http://kubernetes-learning-config-server:80/alpha-app/kube.

N.B. as mentioned by a comment to the question, http://kubernetes-learning-config-server works too because an http:// URL without port number will default to port 80 which coincidentally what you have set as the service port, not because the service decides the port. Should you use another port like 8080, the URL without a port number would not work.

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spring boot - Unable to connect to service in same namespace in kubernetes - Stack Overflow

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