# Start Kafka and create a topic, e.g. :
$ confluent local services kafka start
$ kafka-topics --create --topic test --bootstrap-server localhost:9092

$ PRIVATE_IP=$(ip addr show eth0 | grep 'inet\b' | awk '{print $2}' | cut -d/ -f1)

# Metadata with kafkacat local (does also work with broker localhost:9092), SUCCESS:
$ /usr/bin/kafkacat -L -b $PRIVATE_IP:9092 -t test
Metadata for test (from broker -1: 172.25.113.126::9092/bootstrap):
 1 brokers:
  broker 0 at my-computer-mikaello:9092 (controller)
 1 topics:
  topic "test" with 1 partitions:
    partition 0, leader 0, replicas: 0, isrs: 0

# Metadata with kafkacat docker, SUCCESS:
$ docker run -it --network=host edenhill/kafkacat:1.6.0 -L -b $PRIVATE_IP:9092 -t test
Metadata for test (from broker -1: 172.25.113.126:9092/bootstrap):
 1 brokers:
  broker 0 at my-computer-mikaello:9092 (controller)
 1 topics:
  topic "test" with 1 partitions:
    partition 0, leader 0, replicas: 0, isrs: 0

# Consume with kafkacat local, SUCCESS:
$ /usr/bin/kafkacat -C -b $PRIVATE_IP:9092 -t test -e
% Reached end of topic test [0] at offset 0: exiting

# Consume with kafkacat docker, FAILURE:
$ docker run -it --network=host edenhill/kafkacat:1.6.0 -C -b $PRIVATE_IP:9092 -t test -e
%3|1614806333.215|FAIL|rdkafka#consumer-1| [thrd:my-computer-mikaello:9092/0]: my-computer-mikaello:9092/0: Failed to resolve 'my-computer-mikaello:9092': Name does not resolve (after 3ms in state CONNECT)
% ERROR: Topic test [0] error: Failed to query logical offset END: Local: Host resolution failure