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antonmiantonmi
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Try dnssrv. it doesn't work, see bitwalker/libcluster#123 
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‎apps/app_a/config/runtime.exs‎

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import Config
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cond do
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System.get_env("LIBCLUSTER_STRATEGY") == "kubernetes.dnssrv" ->
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config :libcluster,
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topologies: [
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k8s_dnssrv: [
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strategy: Cluster.Strategy.Kubernetes.DNSSRV,
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config: [
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service: "beam-headless",
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application_name: "cluster-app",
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namespace: "default",
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]
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]
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]
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System.get_env("LIBCLUSTER_STRATEGY") == "kubernetes.dns" ->
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config :libcluster,
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topologies: [

‎apps/app_b/config/runtime.exs‎

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import Config
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cond do
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System.get_env("LIBCLUSTER_STRATEGY") == "kubernetes.dnssrv" ->
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config :libcluster,
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topologies: [
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k8s_dnssrv: [
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strategy: Cluster.Strategy.Kubernetes.DNSSRV,
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config: [
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service: "beam-headless",
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application_name: "cluster-app",
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namespace: "default",
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]
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]
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]
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System.get_env("LIBCLUSTER_STRATEGY") == "kubernetes.dns" ->
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config :libcluster,
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topologies: [

‎k8s_dnssrv/app-a-deployment.yaml‎

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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: cluster-app
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spec:
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serviceName: "beam-headless"
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replicas: 3
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selector:
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matchLabels:
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cluster: beam
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template:
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metadata:
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labels:
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component: app-a
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cluster: beam
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spec:
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containers:
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- name: app-a
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image: app-a
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imagePullPolicy: Never
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ports:
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- containerPort: 4001
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- containerPort: 9000
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env:
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- name: LIBCLUSTER_STRATEGY
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value: "kubernetes.dnssrv"
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- name: PORT
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value: "4001"
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- name: START_SERVER
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value: "true"
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- name: ERLANG_COOKIE
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value: "secret"
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- name: POD_IP
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valueFrom:
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fieldRef:
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fieldPath: status.podIP
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- name: POD_NAME
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valueFrom:
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fieldRef:
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fieldPath: metadata.name
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command: [ "elixir" ]
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args: [
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"--name",
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"cluster-app@$(POD_NAME).beam-headless.default.svc.cluster.local",
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"--cookie","$(ERLANG_COOKIE)",
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"--erl",
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"-kernel inet_dist_listen_min 9000 inet_dist_listen_max 9000",
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"--no-halt",
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"-S","mix",
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"run"
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]

‎k8s_dnssrv/app-b-deployment.yaml‎

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#apiVersion: apps/v1
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#kind: StatefulSet
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#metadata:
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# name: cluster-app
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#spec:
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# serviceName: "beam-headless"
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# replicas: 3
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# selector:
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# matchLabels:
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# cluster: beam
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# template:
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# metadata:
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# labels:
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# component: app-b
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# cluster: beam
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# spec:
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# containers:
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# - name: app-b
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# image: app-b
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# imagePullPolicy: Never
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# ports:
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# - containerPort: 4002
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# - containerPort: 9000
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# env:
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# - name: LIBCLUSTER_STRATEGY
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# value: "kubernetes.dnssrv"
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# - name: PORT
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# value: "4002"
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# - name: START_SERVER
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# value: "true"
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# - name: ERLANG_COOKIE
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# value: "secret"
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# - name: POD_IP
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# valueFrom:
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# fieldRef:
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# fieldPath: status.podIP
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# - name: POD_NAME
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# valueFrom:
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# fieldRef:
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# fieldPath: metadata.name
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# command: [ "elixir" ]
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# args: [
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# "--name",
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# "cluster-app@$(POD_NAME).beam-headless.default.svc.cluster.local",
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# "--cookie","$(ERLANG_COOKIE)",
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# "--erl",
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# "-kernel inet_dist_listen_min 9000 inet_dist_listen_max 9000",
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# "--no-halt",
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# "-S","mix",
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# "run"
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# ]

‎k8s_dnssrv/livebook-deployment.yaml‎

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#apiVersion: apps/v1
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#kind: Deployment
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#metadata:
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# name: livebook-deployment
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#spec:
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# replicas: 1
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# selector:
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# matchLabels:
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# component: livebook
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# template:
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# metadata:
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# labels:
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# component: livebook
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# cluster: beam
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# spec:
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# containers:
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# - name: livebook
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# image: antonmi/livebook
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# ports:
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# - containerPort: 8080
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# - containerPort: 8081
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# env:
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# - name: LIBCLUSTER_STRATEGY
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# value: "kubernetes.dns"
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# - name: LIVEBOOK_PASSWORD
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# value: "securesecret"
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# - name: LIVEBOOK_COOKIE
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# value: "secret"
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# - name: ERLANG_COOKIE
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# value: "secret"
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# - name: LIVEBOOK_DISTRIBUTION
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# value: "name"
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# - name: POD_IP
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# valueFrom:
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# fieldRef:
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# fieldPath: status.podIP
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# - name: LIVEBOOK_NODE
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# value: "cluster-app@$(POD_IP)"
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# - name: LIVEBOOK_DEFAULT_RUNTIME
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# value: "attached:$(LIVEBOOK_NODE):$(LIVEBOOK_COOKIE)"

‎k8s_dnssrv/livebook-service.yaml‎

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apiVersion: v1
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kind: Service
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metadata:
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name: livebook-service
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spec:
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type: LoadBalancer
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ports:
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- name: http
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port: 8080
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targetPort: 8080
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# - name: web-socket
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# port: 8081
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# targetPort: 8081
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selector:
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component: livebook

‎k8s_dnssrv/service-a.yaml‎

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apiVersion: v1
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kind: Service
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metadata:
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name: service-a
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spec:
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type: LoadBalancer
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ports:
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- port: 4001
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targetPort: 4001
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selector:
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component: app-a

‎k8s_dnssrv/service-b.yaml‎

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apiVersion: v1
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kind: Service
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metadata:
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name: service-b
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spec:
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type: LoadBalancer
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ports:
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- port: 4002
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targetPort: 4002
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selector:
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component: app-b

‎k8s_dnssrv/service-beam-cluster.yaml‎

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# use for Cluster.Strategy.Kubernetes.DNS
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apiVersion: v1
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kind: Service
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metadata:
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name: beam-headless
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labels:
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cluster: beam
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spec:
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clusterIP: None
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selector:
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cluster: beam

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