Building Enterprise JavaScript Applications

Validating Zen Discovery on the remote cluster

Let's validate that all three Elasticsearch nodes has been successfully added to the Elasticsearch cluster once more. We can do this by sending a GET request to /_cluster/state?pretty and checking the output.

But since we want to keep the database service internal, we haven't exposed it to an external-reachable URL, so the only way to validate this is to SSH into one of the VPS and query Elasticsearch using its private IP.

However, kubectl provides a more convenient alternative. kubectl has a port-forward command, which forwards requests going into a port on localhost to a port on one of the Pods. We can use this feature to send requests from our local machine to each Elasticsearch instance. ...