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why do you have to patch the deployment to inject hostnames? DO you not have working DNS?

well I need to ask our ID administrator to add DNS entries. so rancher doesnt resolve automatic we need dns entries defined?

How would that work exactly? Rancher does not have the ability to create DNS entires in your DNS server for you. If you specify a hostname for something outside the cluster, that hostname needs to actually exist.

Yes you right its basics 😄