How can I setup something like eureka.client.serviceUri?

You have to have a Kubernetes service on top of the eureka pods/deployments which then will provide you a referable IP address and port number. And then use that referable address to look up the Eureka service, instead of "8761".

To address further question about HA configuration of Eureka

You shouldn't have more than one pod/replica of Eureka per k8s service (remember, pods are ephemeral, you need a referable IP address/domain name for eureka service registry). To achieve high availability (HA), spin up more k8s services with one pod in each.

• Eureka service 1 --> a single pod
• Eureka Service 2 --> another single pod
• ..
• ..
• Eureka Service n --> another single pod

So, now you have referable IP/Domain name (IP of the k8s service) for each of your Eureka.. now it can register each other.

Feeling like it's an overkill?If all your services are in same kubernetes namespace you can achieve everything (well, almost everything, except client side load balancing) that eureka offers though k8s service + KubeDNS add-On. Read this article by Christian Posta

Edit

Instead of Services with one pod each, you can make use of StatefulSets as Stefan Ocke pointed out.

Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. Unlike a Deployment, a StatefulSet maintains a sticky identity for each of their Pods. These pods are created from the same spec, but are not interchangeable: each has a persistent identifier that it maintains across any rescheduling.

Regarding HA configuration of Eureka in Kubernetes: You can (meanwhile) use a StatefulSet for this instead of creating a service for each instance. The StatefulSet guarantees stable network identity for each instance you create.For example, the deployment could look like the following yaml (StatefulSet + headless Service).There are two Eureka instances here, according to the DNS naming rules for StatefulSets (assuming namespace is "default"):

• eureka-0.eureka.default.svc.cluster.local and

• eureka-1.eureka.default.svc.cluster.local

As long as your pods are in the same namespace, they can reach Eureka also as:

• eureka-0.eureka
• eureka-1.eureka

Note: The docker image used in the example is from https://github.com/stefanocke/eureka. You might want to chose or build your own one.

---apiVersion: v1kind: Servicemetadata:  name: eureka  labels:    app: eurekaspec:  ports:  - port: 8761    name: eureka  clusterIP: None  selector:    app: eureka---    apiVersion: apps/v1beta2kind: StatefulSetmetadata:  name: eurekaspec:  serviceName: "eureka"  replicas: 2   selector:    matchLabels:      app: eureka  template:    metadata:      labels:        app: eureka    spec:      containers:      - name: eureka        image: stoc/eureka        ports:        - containerPort: 8761        env:        - name: MY_POD_NAME          valueFrom:            fieldRef:              fieldPath: metadata.name          # Due to camelcase issues with "defaultZone" and "preferIpAddress", _JAVA_OPTIONS is used here        - name: _JAVA_OPTIONS          value: -Deureka.instance.preferIpAddress=false -Deureka.client.serviceUrl.defaultZone=http://eureka-0.eureka:8761/eureka/,http://eureka-1.eureka:8761/eureka/        - name: EUREKA_CLIENT_REGISTERWITHEUREKA          value: "true"        - name: EUREKA_CLIENT_FETCHREGISTRY          value: "true"        # The hostnames must match with the the eureka serviceUrls, otherwise the replicas are reported as unavailable in the eureka dashboard              - name: EUREKA_INSTANCE_HOSTNAME          value: ${MY_POD_NAME}.eureka  # No need to start the pods in order. We just need the stable network identitypodManagementPolicy: "Parallel"

@Stefan Ocke i'm trying to the same setup the same, but with my own image of eureka server. but i keep getting this error

Request execution failed with message: java.net.ConnectException: Connection refused (Connection refused)2019-09-27 06:27:03.363 ERROR 1 --- [           main] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://eureka-1.eureka:8761/eureka/}

Here are configurations:

Eureka Spring Properties:

server.port=${EUREKA_PORT}spring.security.user.name=${EUREKA_USERNAME}spring.security.user.password=${EUREKA_PASSWORD}eureka.client.register-with-eureka=trueeureka.client.fetch-registry=trueeureka.instance.prefer-ip-address=falseeureka.server.wait-time-in-ms-when-sync-empty=0eureka.server.eviction-interval-timer-in-ms=15000eureka.instance.leaseRenewalIntervalInSeconds=30eureka.instance.leaseExpirationDurationInSeconds=30eureka.instance.hostname=${EUREKA_INSTANCE_HOSTNAME}eureka.client.serviceUrl.defaultZone=http://eureka-0.eureka:8761/eureka/,http://eureka-1.eureka:8761/eureka/

StatefulSet Config:

apiVersion: apps/v1kind: StatefulSetmetadata:  name: eurekaspec:  serviceName: "eureka"  podManagementPolicy: "Parallel"   replicas: 2  selector:    matchLabels:      app: eureka  template:    metadata:      labels:        app: eureka        spec:      containers:      - name: eureka        image: "my-image"        command: ["java", "-Djava.security.egd=file:/dev/./urandom", "-jar","/app/eureka-service.jar"]        ports:        - containerPort: 8761        env:         - name: EUREKA_PORT          value: "8761"        - name: EUREKA_USERNAME          value: "theusername"        - name: EUREKA_PASSWORD          value: "thepassword"        - name: MY_POD_NAME          valueFrom:            fieldRef:              fieldPath: metadata.name        - name: EUREKA_INSTANCE_HOSTNAME          value: ${MY_POD_NAME}.eureka   

Service Config:

apiVersion: v1kind: Servicemetadata:  name: eureka  labels:    app: eurekaspec:  clusterIP: None  selector:    app: eureka  ports:  - port: 8761    targetPort: 8761

Ingress Controller:

apiVersion: extensions/v1beta1kind: Ingressmetadata:  name: ingress-service  annotations:    kubernetes.io/ingress.class: nginx    nginx.ingress.kubernetes.io/rewrite-target: /spec:  rules:    - http:        paths:          - path: /            backend:              serviceName: eureka              servicePort: 8761