Apache Kafka listenersΒΆ
Charmed Apache Kafka comes with a set of listeners that can be enabled for inter-broker and broker-controller communication, and for client communication.
Internal listeners are used for internal traffic and exchange of information between Apache Kafka brokers and controllers. These will be created by default.
Client listeners are used for external clients, and are optionally enabled based on the relations created on particular charm endpoints. Each listener is characterised by a specific port, scope and protocol.
In the following table, we summarise the protocols, the port and
the relation that each listener is bound to. Note that based on whether a certificates
relation is present, one of two mutually exclusive types of listeners can be
opened.
Usage |
Driving endpoints |
Protocol |
Port |
Scope |
|---|---|---|---|---|
Broker |
|
SASL_SSL |
|
internal-only |
Controller |
|
SASL_SSL |
|
internal-only |
Broker |
|
SASL_PLAINTEXT |
|
client |
Broker |
|
SASL_SSL |
|
client |
Broker |
|
SSL |
|
client |
Broker |
|
SSL |
|
client |