Apache Kafka

Canonical
Databases

Architecture:

Base version:

Channel	Revision	Published	Runs on
3/stable	185	23 Oct 2024	Ubuntu 22.04
3/candidate	188	13 Nov 2024	Ubuntu 22.04
3/beta	188	13 Nov 2024	Ubuntu 22.04
3/edge	190	Today	Ubuntu 22.04

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Platform:

22.04

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Kafka listeners

Charmed Kafka comes with a set of listeners that can be enabled for inter- and intra-cluster communication.

Internal listeners are used for internal traffic and exchange of information between Kafka brokers, whereas external listeners are used for external clients to be optionally enabled based the relations created on particular charm endpoints. Each listener is characterized by a specific port, scope and protocol.

In the following table we summarize the protocols, the port and the relation that each listener is bound to. Nota that based on whether a certificates relation is present, one of two mutually exclusive type of listener can be opened.

Listener name	Driving endpoints	Protocol	Port	Scope
SASL_INTERNAL	`cluster`	SASL_PLAINTEXT	`19092`	internal
SASL_INTERNAL	`cluster` + `certificates`	SASL_SSL	`19093`	internal
SASL_EXTERNAL	`kafka-client`	SASL_PLAINTEXT	`9092`	external
SASL_EXTERNAL	`kafka-client` + `certificates`	SASL_SSL	`9093`	external
SSL_EXTERNAL	`trusted-certificate` + `certificates`	SSL	`9094`	external
SSL_EXTERNAL	`trusted-ca` + `certificates`	SSL	`9094`	external

Note Since cluster is a peer-relation, the SASL_INTERNAL listener is always enabled.

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