h4.yaml

# Deployment for HarperDB
apiVersion: apps/v1
kind: Deployment
metadata:
  name: harperdb
  namespace: database # note the namespace we created earlier
spec:
  selector:
    matchLabels:
      app: harperdb # group all the pods under the same label
  template:
    metadata:
      labels:
        app: harperdb # create pods with the label we want to group them under
    spec:
      containers:
      - name: harperdb-container
        image: harperdb/harperdb # same hdb image from dockerhub
        env:
          - name: HDB_ADMIN_USERNAME
            value: harperdb # fixing username, in production this should be a secret
          - name: HDB_ADMIN_PASSWORD
            value: harperdb # fixing password, in production this should be a secret
        resources:
          limits:
            memory: "1024Mi" # limiting the usage of memory
            cpu: "512m" # limiting the usage of CPU to 512 millicores
        ports:
        - containerPort: 9925 # exposing the port 9925 to the outside world
          name: hdb-api # naming the port
        volumeMounts: # creating a persistent volume to store the data
          - mountPath: "/opt/harperdb" # mounting the volume to the path we want
            name: hdb-data # referencing the volume we want to mount
        livenessProbe: # creating a liveness probe to check if the container is running
          tcpSocket: # we'll ping hdb's port 9925
            port: 9925
          initialDelaySeconds: 30 # wait 30 seconds before starting the probe
          periodSeconds: 10 # then check the probe every 10 seconds
        readinessProbe: # creating a readiness probe to check if the container is ready to accept connections
          tcpSocket:
            port: 9925
          initialDelaySeconds: 10 # wait 10 seconds before starting the probe
          periodSeconds: 5 # then check the probe every 5 seconds
      volumes:
        - name:  hdb-data # this is the volume we'll mount
          persistentVolumeClaim: # it references another persistent volume claim
            claimName: harperdb-data # this is the name of the persistent volume claim