Omnibus KAS failed handshake in pod

Using the omnibus install and attempting to enable the KAS - we don’t have access to helm charts etc so we just change the config and reconfigure.

GitLab version 14.1.7-ee

We’ve successfully installed the agent into kubernetes but the agent seems not to be able to talk to the gitlab KAS the pod log is on a loop of failed to send handshake request GET no such host.

It’s not clear from the docs do we need to set this DNS up for KAS or is all that needs to be done is the config change and we should expect it to work?