How to get health checks to work on Kubernetes load balancer

Hi, Please tell me how to get health checks to work on a load balancer which is used by Kubernetes. I am running DOs managed Kubernetes service and spawned a Load Balancer service which has created an external load balancer, however when I hit the IP via HTTP I get a 503 gateway. When I check the health statuses of the nodes, they appear down.

Any help would be much appreciated. This is my yml for the service:

apiVersion: v1
kind: Service
  name: wordpress
    app: wordpress
  annotations: "http" "/health"
  type: LoadBalancer
  externalTrafficPolicy: Local
  # the port the service serves on
    - port: 80
    app: wordpress
    tier: frontend

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Problem solved: After executing kubectl exec -it pod-name-1234 sh, I used top to see Apache wasn’t running in my applications container. After checking the image, I noticed Apache was never going to run as it wasn’t included in the container build. Included Apache, problem solved after applying the new deployment yaml file.