UnknownHostException kafka

Question

I am trying to setup a Kafka cluster (the first node in the cluster actually).

I have a single node zookeeper cluster setup. I am setting up kafka on a separate node.

Answer 1

As noplay pointed out the issue was that Kafka wasn't able to resolve the correct IP, this may happen for example on you EC2 instances running in private subnets without assignment of public IP. The solution summarized:

hostname

Which will show you the host name, something like ip-10-180-128-217. Then just update your /etc/hosts

sudo nano /etc/hosts

edit, e.g.

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 ip-10-180-128-217