Running Gridcoin on Kubernetes

Motivation

Gridcoin nodes with focus on high availability are deployed on Kubernetes cluster.

Kubernetes

Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.

Persistent Volumes

Managing storage is a distinct problem from managing compute instances. The PersistentVolume subsystem is used to store blockchain data.

$ kubectl apply -f gridcoin-volume.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: gridcoin-pv-volume
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/gridcoin-pv-volume"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: gridcoin-pv-claim
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi

Deployment

Deployment tells Kubernetes how to create or modify instances of the pods that hold a containerized application.

$ kubectl apply -f gridcoin-deployment.yaml

apiVersion: v1
kind: Service
metadata:
  name: gridcoin
  annotations:
    service.beta.kubernetes.io/exoscale-loadbalancer-id: "21exf891-2750-49a5-mpl8-e3f360e1xa50"
    service.beta.kubernetes.io/exoscale-loadbalancer-external: "true"
spec:
  ports:
  - port: 32749
    protocol: TCP
    targetPort: 32749
  selector:
    app: gridcoin
  type: LoadBalancer
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: gridcoin
spec:
  selector:
    matchLabels:
      app: gridcoin
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: gridcoin
    spec:
      containers:
      - image: osgiliath/gridcoin:oracle9
        name: gridcoin
        env:
        - name: GRIDCOIN_RPC_USER
          value: grcuser
        - name: GRIDCOIN_RPC_PASS
          value: grcpass
        - name: GRIDCOIN_EXT_IP
          value: at.gridcoin.pl
        - name: GRIDCOIN_DATA_DIR
          value: /mnt/gridcoin
        ports:
        - containerPort: 32749
          name: gridcoin
        volumeMounts:
        - name: gridcoin-persistent-storage
          mountPath: /mnt
      volumes:
      - name: gridcoin-persistent-storage
        persistentVolumeClaim:
          claimName: gridcoin-pv-claim