To create a Kafka Cluster run the below to a kafka namespace

helm install --name kafka -f ./kafka/values.yml incubator/kafka --tls

To install the schema-registry use this (do not use schema-registry as service name)

helm install --name sr incubator/schema-registry -f values.yml --tls

helm install --name kc confluent/charts/cp-kafka-connect -f values --tls