yq replace value in manifest yaml

Question

I have a k8s manifest file for loadbalancer below and cannot for the life of me get the $ipaddress be replaced with value, I have got to to overwrite whole file or part of or even just leave blank. How can I replace only the $ipaddress like in below

Tried as example 2 below:

yq e '.spec|=select(.loadBalancerIP) .ports.port = "172.16.87.98"' manifest.yaml
yq e -i '(.spec|=select(.loadBalancerIP.$ipaddress) = "172.16.87.98"' manifest.yaml

  apiVersion: v1
    kind: Service
    metadata:
      name: my-lb-cluster
    spec:
      loadBalancerIP: $ipaddress
      ports:
        - name: ssl
          port: 8080
      selector:
        role: webserver
      sessionAffinity: None
      type: LoadBalancer

Answer 1

If the YAML is as simple as in your question, you can use:

yq e -i '.spec.loadBalancerIP = "172.16.87.98"' manifest.yaml

...to update manifest.yaml and set .loadBalancerIP inside .spec to "172.16.87.98".