Kafka on Kubernetes in minikube not working - kubernetes

Question

I am trying to setup Kafka on Minikube, a very basic setup. I can't validate if Kafka and Zookeeper have been setup correctly because kafkacat fails.
Here is my config:
zookeeper
kind: Deployment
apiVersion: apps/v1
metadata:
name: zookeeper-deployment-1
spec:
selector:
matchLabels:
app: zookeeper-1
template:
metadata:
labels:
app: zookeeper-1
spec:
containers:
- name: zoo1
image: digitalwonderland/zookeeper
ports:
- containerPort: 2181
env:
- name: ZOOKEEPER_ID
value: "1"
- name: ZOOKEEPER_SERVER_1
value: zoo1
---
apiVersion: v1
kind: Service
metadata:
name: zoo1
labels:
app: zookeeper-1
spec:
ports:
- name: client
port: 2181
protocol: TCP
- name: follower
port: 2888
protocol: TCP
- name: leader
port: 3888
protocol: TCP
selector:
app: zookeeper-1
kafka
kind: Deployment
apiVersion: apps/v1
metadata:
name: kafka-broker0
spec:
selector:
matchLabels:
app: kafka
template:
metadata:
labels:
app: kafka
id: "0"
spec:
containers:
- name: kafka
image: wurstmeister/kafka
ports:
- containerPort: 9092
env:
- name: KAFKA_ADVERTISED_PORT
value: "9092"
- name: KAFKA_ADVERTISED_HOST_NAME
value: kafka-service
- name: KAFKA_ZOOKEEPER_CONNECT
value: zoo1:2181
- name: KAFKA_BROKER_ID
value: "0"
---
apiVersion: v1
kind: Service
metadata:
name: kafka-service
labels:
name: kafka
spec:
ports:
- port: 9092
name: kafka-port
protocol: TCP
selector:
app: kafka
id: "0"
pods
kafka-broker0-6885746967-6vktz 1/1 Running 0 5m20s
zookeeper-deployment-1-7f5bb9785f-7pplk 1/1 Running 0 5m25s
svc
kafka-service ClusterIP 10.99.226.129 <none> 9092/TCP 6m30s
zoo1 ClusterIP 10.96.140.187 <none> 2181/TCP,2888/TCP,3888/TCP 6m35s
kafkacat logs
✗ kafkacat -L -b kafka-service:9092 -d broker
%7|1596239513.610|BRKMAIN|rdkafka#producer-1| [thrd::0/internal]: :0/internal: Enter main broker thread
%7|1596239513.610|BROKER|rdkafka#producer-1| [thrd:app]: kafka-service:9092/bootstrap: Added new broker with NodeId -1
%7|1596239513.610|BRKMAIN|rdkafka#producer-1| [thrd:kafka-service:9092/bootstrap]: kafka-service:9092/bootstrap: Enter main broker thread
%7|1596239513.610|CONNECT|rdkafka#producer-1| [thrd:app]: kafka-service:9092/bootstrap: Selected for cluster connection: bootstrap servers added (broker has 0 connection attempt(s))
%7|1596239513.610|INIT|rdkafka#producer-1| [thrd:app]: librdkafka v1.4.0 (0x10400ff) rdkafka#producer-1 initialized (builtin.features gzip,snappy,ssl,sasl,regex,lz4,sasl_gssapi,sasl_plain,sasl_scram,plugins,zstd,sasl_oauthbearer, CC CXX PKGCONFIG OSXLD LIBDL PLUGINS ZLIB SSL SASL_CYRUS ZSTD HDRHISTOGRAM LZ4_EXT SYSLOG SNAPPY SOCKEM SASL_SCRAM SASL_OAUTHBEARER CRC32C_HW, debug 0x2)
%7|1596239513.610|CONNECT|rdkafka#producer-1| [thrd:kafka-service:9092/bootstrap]: kafka-service:9092/bootstrap: Received CONNECT op
%7|1596239513.610|STATE|rdkafka#producer-1| [thrd:kafka-service:9092/bootstrap]: kafka-service:9092/bootstrap: Broker changed state INIT -> TRY_CONNECT
%7|1596239513.610|CONNECT|rdkafka#producer-1| [thrd:kafka-service:9092/bootstrap]: kafka-service:9092/bootstrap: broker in state TRY_CONNECT connecting
%7|1596239513.610|STATE|rdkafka#producer-1| [thrd:kafka-service:9092/bootstrap]: kafka-service:9092/bootstrap: Broker changed state TRY_CONNECT -> CONNECT
%7|1596239513.610|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
%7|1596239513.610|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
%7|1596239513.610|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
%7|1596239513.610|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
%7|1596239513.614|BROKERFAIL|rdkafka#producer-1| [thrd:kafka-service:9092/bootstrap]: kafka-service:9092/bootstrap: failed: err: Local: Host resolution failure: (errno: Bad address)
NODEPORT UPDATE
✗ kafkacat -L -b kafka-service:30236 -d broker
%7|1596476848.078|STATE|rdkafka#producer-1| [thrd:kafka-service:30236/bootstrap]: kafka-service:30236/bootstrap: Broker changed state CONNECT -> DOWN
%7|1596476848.078|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 46ms: application metadata request
%7|1596476848.078|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 46ms: application metadata request
%7|1596476849.065|CONNECT|rdkafka#producer-1| [thrd:app]: Cluster connection already in progress: application metadata request
%7|1596476849.065|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
% ERROR: Failed to acquire metadata: Local: Broker transport failure
minikube ip
✗ kafkacat -L -b 192.168.64.2:30236 -d broker
|1596476908.164|BRKMAIN|rdkafka#producer-1| [thrd:192.168.64.2:30236/bootstrap]: 192.168.64.2:30236/bootstrap: Enter main broker thread
%7|1596476908.164|CONNECT|rdkafka#producer-1| [thrd:app]: 192.168.64.2:30236/bootstrap: Selected for cluster connection: bootstrap servers added (broker has 0 connection attempt(s))
%7|1596476908.164|INIT|rdkafka#producer-1| [thrd:app]: librdkafka v1.4.0 (0x10400ff) rdkafka#producer-1 initialized (builtin.features gzip,snappy,ssl,sasl,regex,lz4,sasl_gssapi,sasl_plain,sasl_scram,plugins,zstd,sasl_oauthbearer, CC CXX PKGCONFIG OSXLD LIBDL PLUGINS ZLIB SSL SASL_CYRUS ZSTD HDRHISTOGRAM LZ4_EXT SYSLOG SNAPPY SOCKEM SASL_SCRAM SASL_OAUTHBEARER CRC32C_HW, debug 0x2)
%7|1596476908.164|CONNECT|rdkafka#producer-1| [thrd:192.168.64.2:30236/bootstrap]: 192.168.64.2:30236/bootstrap: Received CONNECT op
%7|1596476908.164|STATE|rdkafka#producer-1| [thrd:192.168.64.2:30236/bootstrap]: 192.168.64.2:30236/bootstrap: Broker changed state INIT -> TRY_CONNECT
%7|1596476908.164|CONNECT|rdkafka#producer-1| [thrd:192.168.64.2:30236/bootstrap]: 192.168.64.2:30236/bootstrap: broker in state TRY_CONNECT connecting
%7|1596476908.164|STATE|rdkafka#producer-1| [thrd:192.168.64.2:30236/bootstrap]: 192.168.64.2:30236/bootstrap: Broker changed state TRY_CONNECT -> CONNECT
%7|1596476908.164|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
✗ kafkacat -L -b localhost:30236 -d broker
%7|1596477098.454|CONNECT|rdkafka#producer-1| [thrd:localhost:30236/bootstrap]: localhost:30236/bootstrap: Received CONNECT op
%7|1596477098.454|INIT|rdkafka#producer-1| [thrd:app]: librdkafka v1.4.0 (0x10400ff) rdkafka#producer-1 initialized (builtin.features gzip,snappy,ssl,sasl,regex,lz4,sasl_gssapi,sasl_plain,sasl_scram,plugins,zstd,sasl_oauthbearer, CC CXX PKGCONFIG OSXLD LIBDL PLUGINS ZLIB SSL SASL_CYRUS ZSTD HDRHISTOGRAM LZ4_EXT SYSLOG SNAPPY SOCKEM SASL_SCRAM SASL_OAUTHBEARER CRC32C_HW, debug 0x2)
%7|1596477098.454|STATE|rdkafka#producer-1| [thrd:localhost:30236/bootstrap]: localhost:30236/bootstrap: Broker changed state INIT -> TRY_CONNECT
%7|1596477098.454|CONNECT|rdkafka#producer-1| [thrd:localhost:30236/bootstrap]: localhost:30236/bootstrap: broker in state TRY_CONNECT connecting
%7|1596477098.454|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
%7|1596477098.454|STATE|rdkafka#producer-1| [thrd:localhost:30236/bootstrap]: localhost:30236/bootstrap: Broker changed state TRY_CONNECT -> CONNECT
%7|1596477098.454|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
%7|1596477098.454|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
%7|1596477098.454|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 49ms: application metadata request
%7|1596477098.460|CONNECT|rdkafka#producer-1| [thrd:localhost:30236/bootstrap]: localhost:30236/bootstrap: Connecting to ipv4#127.0.0.1:30236 (plaintext) with socket 9
%7|1596477098.461|BROKERFAIL|rdkafka#producer-1| [thrd:localhost:30236/bootstrap]: localhost:30236/bootstrap: failed: err: Local: Broker transport failure: (errno: Connection refused)
%7|1596477098.461|STATE|rdkafka#producer-1| [thrd:localhost:30236/bootstrap]: localhost:30236/bootstrap: Broker changed state CONNECT -> DOWN
%7|1596477098.461|STATE|rdkafka#producer-1| [thrd:localhost:30236/bootstrap]: localhost:30236/bootstrap: Broker changed state DOWN -> INIT
%7|1596477098.461|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 43ms: application metadata request
%7|1596477098.461|CONNECT|rdkafka#producer-1| [thrd:app]: Not selecting any broker for cluster connection: still suppressed for 42ms: application metadata request

Answer 1

apiVersion: v1
kind: Service
metadata:
name: kafka-service
labels:
name: kafka
spec:
type: NodePort
ports:
- port: 9092
nodePort: 30236
name: kafka-port
protocol: TCP
selector:
app: kafka
id: "0"
I have never used kafkacat, but if it is a cli that is installed on your host, and not inside of another container, you can use it like this now:
✗ kafkacat -L -b localhost:30236 -d broker
localhost, or the ip of your kubernetes node.
Using a service default is of type ClusterIp, and this can be accessed only inside the kubernetes cluster