I wrote small application that support clustering with Akka Cluster. I want to deploy it to Kubernetes with support scaling. This is my docker-compose.yml file:
version: '3.5' networks: cluster-network: services: seed: networks: - cluster-network image: akka-cluster-server ports: - '2552:2552' - '8000:8000' environment: SERVER_IP: 0.0.0.0 CLUSTER_IP: seed CLUSTER_SEED_IP: seed node1: networks: - cluster-network image: akka-cluster-server ports: - '8001:8000' environment: SERVER_IP: 0.0.0.0 CLUSTER_IP: node1 CLUSTER_PORT: 1600 CLUSTER_SEED_IP: seed CLUSTER_SEED_PORT: 2552 node2: networks: - cluster-network image: akka-cluster-server ports: - '8002:8000' environment: SERVER_IP: 0.0.0.0 CLUSTER_IP: node2 CLUSTER_PORT: 1600 CLUSTER_SEED_IP: seed CLUSTER_SEED_PORT: 2552 There is three instances that share network among themselves. Note that node1 and node2 use seed's DNS name to connect. I wrote simple deployment and service.
Deployment:
apiVersion: apps/v1 kind: Deployment metadata: name: akka-cluster spec: selector: matchLabels: app: akka-cluster replicas: 2 template: metadata: labels: app: akka-cluster spec: containers: - name: server-seed image: akka-cluster-server imagePullPolicy: Never ports: - containerPort: 8000 - containerPort: 2552 env: - name: SERVER_IP value: 0.0.0.0 - name: CLUSTER_IP valueFrom: fieldRef: fieldPath: status.podIP - name: CLUSTER_SEED_IP valueFrom: fieldRef: fieldPath: status.podIP - name: CLUSTER_PORT value: "1600" - name: CLUSTER_SEED_PORT value: "2552" Service:
apiVersion: v1 kind: Service metadata: name: akka-cluster-service spec: type: LoadBalancer selector: app: akka-cluster ports: - protocol: TCP port: 8080 targetPort: 8000 Note that in this case containers will connect to self (CLUSTER_SEED_IP) instead of seed node when you will scale replicas.
How to correct translate my docker-compose.yml to Kubernetes deployment/service?
