wolfstudy commented on issue #9092:
URL: https://github.com/apache/pulsar/issues/9092#issuecomment-753923726


   > "error" : "UNAVAILABLE: Unable to resolve host 
pf-public-default-my-elasticsearch-sink-0.pf-public-default-my-elasticsearch-sink.pulsar.svc.cluster.local",
   
   This is because your terminal cannot connect to the ip address in the pod. 
You can use ping or telnet to verify. Under normal circumstances, this network 
connection is not working. You can consider the following solutions:
   
   - If it is a test environment, you can use kubectl exec -it <your pod name>, 
enter the pod, and then execute the above command.
   - If it is a production environment, you can consider using DNS and other 
methods to expose the address to be accessed


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